718 lines
27 KiB
Python
718 lines
27 KiB
Python
from __future__ import unicode_literals
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from django.db import models
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from django.db.migrations.operations.base import Operation
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from django.db.migrations.state import ModelState
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from django.db.models.options import normalize_together
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from django.utils import six
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from django.utils.functional import cached_property
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from .fields import (
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AddField, AlterField, FieldOperation, RemoveField, RenameField,
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)
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class ModelOperation(Operation):
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def __init__(self, name):
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self.name = name
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@cached_property
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def name_lower(self):
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return self.name.lower()
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def reduce(self, operation, in_between, app_label=None):
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return (
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super(ModelOperation, self).reduce(operation, in_between, app_label=app_label) or
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not operation.references_model(self.name, app_label)
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)
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class CreateModel(ModelOperation):
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"""
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Create a model's table.
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"""
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serialization_expand_args = ['fields', 'options', 'managers']
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def __init__(self, name, fields, options=None, bases=None, managers=None):
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self.fields = fields
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self.options = options or {}
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self.bases = bases or (models.Model,)
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self.managers = managers or []
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super(CreateModel, self).__init__(name)
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def deconstruct(self):
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kwargs = {
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'name': self.name,
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'fields': self.fields,
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}
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if self.options:
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kwargs['options'] = self.options
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if self.bases and self.bases != (models.Model,):
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kwargs['bases'] = self.bases
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if self.managers and self.managers != [('objects', models.Manager())]:
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kwargs['managers'] = self.managers
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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state.add_model(ModelState(
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app_label,
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self.name,
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list(self.fields),
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dict(self.options),
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tuple(self.bases),
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list(self.managers),
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))
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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model = to_state.apps.get_model(app_label, self.name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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schema_editor.create_model(model)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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model = from_state.apps.get_model(app_label, self.name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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schema_editor.delete_model(model)
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def describe(self):
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return "Create %smodel %s" % ("proxy " if self.options.get("proxy", False) else "", self.name)
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def references_model(self, name, app_label=None):
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strings_to_check = [self.name]
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# Check we didn't inherit from the model
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for base in self.bases:
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if isinstance(base, six.string_types):
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strings_to_check.append(base.split(".")[-1])
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# Check we have no FKs/M2Ms with it
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for fname, field in self.fields:
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if field.remote_field:
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if isinstance(field.remote_field.model, six.string_types):
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strings_to_check.append(field.remote_field.model.split(".")[-1])
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# Now go over all the strings and compare them
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for string in strings_to_check:
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if string.lower() == name.lower():
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return True
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return False
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def model_to_key(self, model):
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"""
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Take either a model class or an "app_label.ModelName" string
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and return (app_label, object_name).
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"""
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if isinstance(model, six.string_types):
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return model.split(".", 1)
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else:
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return model._meta.app_label, model._meta.object_name
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def reduce(self, operation, in_between, app_label=None):
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if (isinstance(operation, DeleteModel) and
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self.name_lower == operation.name_lower and
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not self.options.get("proxy", False)):
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return []
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elif isinstance(operation, RenameModel) and self.name_lower == operation.old_name_lower:
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return [
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CreateModel(
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operation.new_name,
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fields=self.fields,
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options=self.options,
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bases=self.bases,
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managers=self.managers,
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),
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]
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elif isinstance(operation, FieldOperation) and self.name_lower == operation.model_name_lower:
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if isinstance(operation, AddField):
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# Don't allow optimizations of FKs through models they reference
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if hasattr(operation.field, "remote_field") and operation.field.remote_field:
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for between in in_between:
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# Check that it doesn't point to the model
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app_label, object_name = self.model_to_key(operation.field.remote_field.model)
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if between.references_model(object_name, app_label):
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return False
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# Check that it's not through the model
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if getattr(operation.field.remote_field, "through", None):
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app_label, object_name = self.model_to_key(operation.field.remote_field.through)
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if between.references_model(object_name, app_label):
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return False
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return [
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CreateModel(
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self.name,
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fields=self.fields + [(operation.name, operation.field)],
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options=self.options,
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bases=self.bases,
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managers=self.managers,
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),
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]
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elif isinstance(operation, AlterField):
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return [
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CreateModel(
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self.name,
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fields=[
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(n, operation.field if n == operation.name else v)
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for n, v in self.fields
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],
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options=self.options,
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bases=self.bases,
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managers=self.managers,
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),
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]
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elif isinstance(operation, RemoveField):
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return [
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CreateModel(
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self.name,
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fields=[
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(n, v)
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for n, v in self.fields
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if n.lower() != operation.name_lower
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],
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options=self.options,
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bases=self.bases,
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managers=self.managers,
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),
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]
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elif isinstance(operation, RenameField):
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return [
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CreateModel(
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self.name,
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fields=[
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(operation.new_name if n == operation.old_name else n, v)
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for n, v in self.fields
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],
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options=self.options,
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bases=self.bases,
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managers=self.managers,
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),
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]
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return super(CreateModel, self).reduce(operation, in_between, app_label=app_label)
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class DeleteModel(ModelOperation):
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"""
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Drops a model's table.
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"""
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def deconstruct(self):
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kwargs = {
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'name': self.name,
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}
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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state.remove_model(app_label, self.name_lower)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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model = from_state.apps.get_model(app_label, self.name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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schema_editor.delete_model(model)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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model = to_state.apps.get_model(app_label, self.name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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schema_editor.create_model(model)
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def references_model(self, name, app_label=None):
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return name.lower() == self.name_lower
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def describe(self):
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return "Delete model %s" % (self.name, )
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class RenameModel(ModelOperation):
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"""
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Renames a model.
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"""
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def __init__(self, old_name, new_name):
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self.old_name = old_name
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self.new_name = new_name
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super(RenameModel, self).__init__(old_name)
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@cached_property
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def old_name_lower(self):
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return self.old_name.lower()
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@cached_property
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def new_name_lower(self):
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return self.new_name.lower()
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def deconstruct(self):
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kwargs = {
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'old_name': self.old_name,
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'new_name': self.new_name,
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}
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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apps = state.apps
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model = apps.get_model(app_label, self.old_name)
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model._meta.apps = apps
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# Get all of the related objects we need to repoint
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all_related_objects = (
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f for f in model._meta.get_fields(include_hidden=True)
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if f.auto_created and not f.concrete and (not f.hidden or f.many_to_many)
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)
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# Rename the model
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state.models[app_label, self.new_name_lower] = state.models[app_label, self.old_name_lower]
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state.models[app_label, self.new_name_lower].name = self.new_name
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state.remove_model(app_label, self.old_name_lower)
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# Repoint the FKs and M2Ms pointing to us
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for related_object in all_related_objects:
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if related_object.model is not model:
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# The model being renamed does not participate in this relation
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# directly. Rather, a superclass does.
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continue
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# Use the new related key for self referential related objects.
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if related_object.related_model == model:
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related_key = (app_label, self.new_name_lower)
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else:
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related_key = (
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related_object.related_model._meta.app_label,
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related_object.related_model._meta.model_name,
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)
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new_fields = []
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for name, field in state.models[related_key].fields:
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if name == related_object.field.name:
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field = field.clone()
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field.remote_field.model = "%s.%s" % (app_label, self.new_name)
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new_fields.append((name, field))
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state.models[related_key].fields = new_fields
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state.reload_model(*related_key)
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state.reload_model(app_label, self.new_name_lower)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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new_model = to_state.apps.get_model(app_label, self.new_name)
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if self.allow_migrate_model(schema_editor.connection.alias, new_model):
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old_model = from_state.apps.get_model(app_label, self.old_name)
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# Move the main table
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schema_editor.alter_db_table(
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new_model,
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old_model._meta.db_table,
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new_model._meta.db_table,
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)
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# Alter the fields pointing to us
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for related_object in old_model._meta.related_objects:
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if related_object.related_model == old_model:
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model = new_model
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related_key = (app_label, self.new_name_lower)
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else:
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model = related_object.related_model
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related_key = (
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related_object.related_model._meta.app_label,
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related_object.related_model._meta.model_name,
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)
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to_field = to_state.apps.get_model(
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*related_key
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)._meta.get_field(related_object.field.name)
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schema_editor.alter_field(
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model,
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related_object.field,
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to_field,
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)
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# Rename M2M fields whose name is based on this model's name.
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fields = zip(old_model._meta.local_many_to_many, new_model._meta.local_many_to_many)
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for (old_field, new_field) in fields:
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# Skip self-referential fields as these are renamed above.
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if new_field.model == new_field.related_model or not new_field.remote_field.through._meta.auto_created:
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continue
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# Rename the M2M table that's based on this model's name.
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old_m2m_model = old_field.remote_field.through
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new_m2m_model = new_field.remote_field.through
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schema_editor.alter_db_table(
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new_m2m_model,
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old_m2m_model._meta.db_table,
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new_m2m_model._meta.db_table,
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)
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# Rename the column in the M2M table that's based on this
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# model's name.
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schema_editor.alter_field(
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new_m2m_model,
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old_m2m_model._meta.get_field(old_model._meta.model_name),
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new_m2m_model._meta.get_field(new_model._meta.model_name),
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)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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self.new_name_lower, self.old_name_lower = self.old_name_lower, self.new_name_lower
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self.new_name, self.old_name = self.old_name, self.new_name
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self.database_forwards(app_label, schema_editor, from_state, to_state)
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self.new_name_lower, self.old_name_lower = self.old_name_lower, self.new_name_lower
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self.new_name, self.old_name = self.old_name, self.new_name
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def references_model(self, name, app_label=None):
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return (
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name.lower() == self.old_name_lower or
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name.lower() == self.new_name_lower
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)
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def describe(self):
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return "Rename model %s to %s" % (self.old_name, self.new_name)
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def reduce(self, operation, in_between, app_label=None):
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if (isinstance(operation, RenameModel) and
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self.new_name_lower == operation.old_name_lower):
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return [
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RenameModel(
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self.old_name,
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operation.new_name,
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),
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]
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# Skip `ModelOperation.reduce` as we want to run `references_model`
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# against self.new_name.
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return (
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super(ModelOperation, self).reduce(operation, in_between, app_label=app_label) or
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not operation.references_model(self.new_name, app_label)
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)
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class AlterModelTable(ModelOperation):
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"""
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Renames a model's table
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"""
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def __init__(self, name, table):
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self.table = table
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super(AlterModelTable, self).__init__(name)
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def deconstruct(self):
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kwargs = {
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'name': self.name,
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'table': self.table,
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}
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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state.models[app_label, self.name_lower].options["db_table"] = self.table
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state.reload_model(app_label, self.name_lower)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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new_model = to_state.apps.get_model(app_label, self.name)
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if self.allow_migrate_model(schema_editor.connection.alias, new_model):
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old_model = from_state.apps.get_model(app_label, self.name)
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schema_editor.alter_db_table(
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new_model,
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old_model._meta.db_table,
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new_model._meta.db_table,
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)
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# Rename M2M fields whose name is based on this model's db_table
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for (old_field, new_field) in zip(old_model._meta.local_many_to_many, new_model._meta.local_many_to_many):
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if new_field.remote_field.through._meta.auto_created:
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schema_editor.alter_db_table(
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new_field.remote_field.through,
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old_field.remote_field.through._meta.db_table,
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new_field.remote_field.through._meta.db_table,
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)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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return self.database_forwards(app_label, schema_editor, from_state, to_state)
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def references_model(self, name, app_label=None):
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return name.lower() == self.name_lower
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def describe(self):
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return "Rename table for %s to %s" % (self.name, self.table)
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def reduce(self, operation, in_between, app_label=None):
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if isinstance(operation, (AlterModelTable, DeleteModel)) and self.name_lower == operation.name_lower:
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return [operation]
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return super(AlterModelTable, self).reduce(operation, in_between, app_label=app_label)
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class ModelOptionOperation(ModelOperation):
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def reduce(self, operation, in_between, app_label=None):
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if isinstance(operation, (self.__class__, DeleteModel)) and self.name_lower == operation.name_lower:
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return [operation]
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return super(ModelOptionOperation, self).reduce(operation, in_between, app_label=app_label)
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class FieldRelatedOptionOperation(ModelOptionOperation):
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def reduce(self, operation, in_between, app_label=None):
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if (isinstance(operation, FieldOperation) and
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self.name_lower == operation.model_name_lower and
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not self.references_field(operation.model_name, operation.name)):
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return [operation, self]
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return super(FieldRelatedOptionOperation, self).reduce(operation, in_between, app_label=app_label)
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class AlterUniqueTogether(FieldRelatedOptionOperation):
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"""
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Changes the value of unique_together to the target one.
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Input value of unique_together must be a set of tuples.
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"""
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option_name = "unique_together"
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def __init__(self, name, unique_together):
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unique_together = normalize_together(unique_together)
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self.unique_together = set(tuple(cons) for cons in unique_together)
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super(AlterUniqueTogether, self).__init__(name)
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def deconstruct(self):
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kwargs = {
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'name': self.name,
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'unique_together': self.unique_together,
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}
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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model_state = state.models[app_label, self.name_lower]
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model_state.options[self.option_name] = self.unique_together
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state.reload_model(app_label, self.name_lower)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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new_model = to_state.apps.get_model(app_label, self.name)
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if self.allow_migrate_model(schema_editor.connection.alias, new_model):
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old_model = from_state.apps.get_model(app_label, self.name)
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schema_editor.alter_unique_together(
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new_model,
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getattr(old_model._meta, self.option_name, set()),
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getattr(new_model._meta, self.option_name, set()),
|
|
)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
return self.database_forwards(app_label, schema_editor, from_state, to_state)
|
|
|
|
def references_model(self, name, app_label=None):
|
|
return name.lower() == self.name_lower
|
|
|
|
def references_field(self, model_name, name, app_label=None):
|
|
return (
|
|
self.references_model(model_name, app_label) and
|
|
(
|
|
not self.unique_together or
|
|
any((name in together) for together in self.unique_together)
|
|
)
|
|
)
|
|
|
|
def describe(self):
|
|
return "Alter %s for %s (%s constraint(s))" % (self.option_name, self.name, len(self.unique_together or ''))
|
|
|
|
|
|
class AlterIndexTogether(FieldRelatedOptionOperation):
|
|
"""
|
|
Changes the value of index_together to the target one.
|
|
Input value of index_together must be a set of tuples.
|
|
"""
|
|
option_name = "index_together"
|
|
|
|
def __init__(self, name, index_together):
|
|
index_together = normalize_together(index_together)
|
|
self.index_together = set(tuple(cons) for cons in index_together)
|
|
super(AlterIndexTogether, self).__init__(name)
|
|
|
|
def deconstruct(self):
|
|
kwargs = {
|
|
'name': self.name,
|
|
'index_together': self.index_together,
|
|
}
|
|
return (
|
|
self.__class__.__name__,
|
|
[],
|
|
kwargs
|
|
)
|
|
|
|
def state_forwards(self, app_label, state):
|
|
model_state = state.models[app_label, self.name_lower]
|
|
model_state.options[self.option_name] = self.index_together
|
|
state.reload_model(app_label, self.name_lower)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
new_model = to_state.apps.get_model(app_label, self.name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, new_model):
|
|
old_model = from_state.apps.get_model(app_label, self.name)
|
|
schema_editor.alter_index_together(
|
|
new_model,
|
|
getattr(old_model._meta, self.option_name, set()),
|
|
getattr(new_model._meta, self.option_name, set()),
|
|
)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
return self.database_forwards(app_label, schema_editor, from_state, to_state)
|
|
|
|
def references_model(self, name, app_label=None):
|
|
return name.lower() == self.name_lower
|
|
|
|
def references_field(self, model_name, name, app_label=None):
|
|
return (
|
|
self.references_model(model_name, app_label) and
|
|
(
|
|
not self.index_together or
|
|
any((name in together) for together in self.index_together)
|
|
)
|
|
)
|
|
|
|
def describe(self):
|
|
return "Alter %s for %s (%s constraint(s))" % (self.option_name, self.name, len(self.index_together or ''))
|
|
|
|
|
|
class AlterOrderWithRespectTo(FieldRelatedOptionOperation):
|
|
"""
|
|
Represents a change with the order_with_respect_to option.
|
|
"""
|
|
|
|
def __init__(self, name, order_with_respect_to):
|
|
self.order_with_respect_to = order_with_respect_to
|
|
super(AlterOrderWithRespectTo, self).__init__(name)
|
|
|
|
def deconstruct(self):
|
|
kwargs = {
|
|
'name': self.name,
|
|
'order_with_respect_to': self.order_with_respect_to,
|
|
}
|
|
return (
|
|
self.__class__.__name__,
|
|
[],
|
|
kwargs
|
|
)
|
|
|
|
def state_forwards(self, app_label, state):
|
|
model_state = state.models[app_label, self.name_lower]
|
|
model_state.options['order_with_respect_to'] = self.order_with_respect_to
|
|
state.reload_model(app_label, self.name_lower)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
to_model = to_state.apps.get_model(app_label, self.name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
|
|
from_model = from_state.apps.get_model(app_label, self.name)
|
|
# Remove a field if we need to
|
|
if from_model._meta.order_with_respect_to and not to_model._meta.order_with_respect_to:
|
|
schema_editor.remove_field(from_model, from_model._meta.get_field("_order"))
|
|
# Add a field if we need to (altering the column is untouched as
|
|
# it's likely a rename)
|
|
elif to_model._meta.order_with_respect_to and not from_model._meta.order_with_respect_to:
|
|
field = to_model._meta.get_field("_order")
|
|
if not field.has_default():
|
|
field.default = 0
|
|
schema_editor.add_field(
|
|
from_model,
|
|
field,
|
|
)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
self.database_forwards(app_label, schema_editor, from_state, to_state)
|
|
|
|
def references_model(self, name, app_label=None):
|
|
return name.lower() == self.name_lower
|
|
|
|
def references_field(self, model_name, name, app_label=None):
|
|
return (
|
|
self.references_model(model_name, app_label) and
|
|
(
|
|
self.order_with_respect_to is None or
|
|
name == self.order_with_respect_to
|
|
)
|
|
)
|
|
|
|
def describe(self):
|
|
return "Set order_with_respect_to on %s to %s" % (self.name, self.order_with_respect_to)
|
|
|
|
|
|
class AlterModelOptions(ModelOptionOperation):
|
|
"""
|
|
Sets new model options that don't directly affect the database schema
|
|
(like verbose_name, permissions, ordering). Python code in migrations
|
|
may still need them.
|
|
"""
|
|
|
|
# Model options we want to compare and preserve in an AlterModelOptions op
|
|
ALTER_OPTION_KEYS = [
|
|
"get_latest_by",
|
|
"managed",
|
|
"ordering",
|
|
"permissions",
|
|
"default_permissions",
|
|
"select_on_save",
|
|
"verbose_name",
|
|
"verbose_name_plural",
|
|
]
|
|
|
|
def __init__(self, name, options):
|
|
self.options = options
|
|
super(AlterModelOptions, self).__init__(name)
|
|
|
|
def deconstruct(self):
|
|
kwargs = {
|
|
'name': self.name,
|
|
'options': self.options,
|
|
}
|
|
return (
|
|
self.__class__.__name__,
|
|
[],
|
|
kwargs
|
|
)
|
|
|
|
def state_forwards(self, app_label, state):
|
|
model_state = state.models[app_label, self.name_lower]
|
|
model_state.options = dict(model_state.options)
|
|
model_state.options.update(self.options)
|
|
for key in self.ALTER_OPTION_KEYS:
|
|
if key not in self.options and key in model_state.options:
|
|
del model_state.options[key]
|
|
state.reload_model(app_label, self.name_lower)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
pass
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
pass
|
|
|
|
def references_model(self, name, app_label=None):
|
|
return name.lower() == self.name_lower
|
|
|
|
def describe(self):
|
|
return "Change Meta options on %s" % (self.name, )
|
|
|
|
|
|
class AlterModelManagers(ModelOptionOperation):
|
|
"""
|
|
Alters the model's managers
|
|
"""
|
|
|
|
serialization_expand_args = ['managers']
|
|
|
|
def __init__(self, name, managers):
|
|
self.managers = managers
|
|
super(AlterModelManagers, self).__init__(name)
|
|
|
|
def deconstruct(self):
|
|
return (
|
|
self.__class__.__name__,
|
|
[self.name, self.managers],
|
|
{}
|
|
)
|
|
|
|
def state_forwards(self, app_label, state):
|
|
model_state = state.models[app_label, self.name_lower]
|
|
model_state.managers = list(self.managers)
|
|
state.reload_model(app_label, self.name_lower)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
pass
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
pass
|
|
|
|
def references_model(self, name, app_label=None):
|
|
return name.lower() == self.name_lower
|
|
|
|
def describe(self):
|
|
return "Change managers on %s" % (self.name, )
|