158 lines
5.9 KiB
Python
158 lines
5.9 KiB
Python
from .base import Operation
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from django.db import models, router
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from django.db.migrations.state import ModelState
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class CreateModel(Operation):
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"""
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Create a model's table.
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"""
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def __init__(self, name, fields, options=None, bases=None):
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self.name = name
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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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def state_forwards(self, app_label, state):
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state.models[app_label, self.name.lower()] = ModelState(app_label, self.name, self.fields, self.options, self.bases)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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app_cache = to_state.render()
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model = app_cache.get_model(app_label, self.name)
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if router.allow_migrate(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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app_cache = from_state.render()
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model = app_cache.get_model(app_label, self.name)
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if router.allow_migrate(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 model %s" % (self.name, )
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class DeleteModel(Operation):
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"""
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Drops a model's table.
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"""
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def __init__(self, name):
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self.name = name
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def state_forwards(self, app_label, state):
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del state.models[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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app_cache = from_state.render()
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model = app_cache.get_model(app_label, self.name)
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if router.allow_migrate(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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app_cache = to_state.render()
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model = app_cache.get_model(app_label, self.name)
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if router.allow_migrate(schema_editor.connection.alias, model):
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schema_editor.create_model(model)
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def describe(self):
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return "Delete model %s" % (self.name, )
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class AlterModelTable(Operation):
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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.name = name
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self.table = table
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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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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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old_app_cache = from_state.render()
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new_app_cache = to_state.render()
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old_model = old_app_cache.get_model(app_label, self.name)
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new_model = new_app_cache.get_model(app_label, self.name)
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if router.allow_migrate(schema_editor.connection.alias, new_model):
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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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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 describe(self):
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return "Rename table for %s to %s" % (self.name, self.table)
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class AlterUniqueTogether(Operation):
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"""
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Changes the value of index_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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def __init__(self, name, unique_together):
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self.name = name
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self.unique_together = set(tuple(cons) for cons in unique_together)
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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["unique_together"] = self.unique_together
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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old_app_cache = from_state.render()
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new_app_cache = to_state.render()
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old_model = old_app_cache.get_model(app_label, self.name)
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new_model = new_app_cache.get_model(app_label, self.name)
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if router.allow_migrate(schema_editor.connection.alias, new_model):
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schema_editor.alter_unique_together(
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new_model,
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getattr(old_model._meta, "unique_together", set()),
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getattr(new_model._meta, "unique_together", set()),
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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 describe(self):
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return "Alter unique_together for %s (%s constraints)" % (self.name, len(self.unique_together))
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class AlterIndexTogether(Operation):
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"""
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Changes the value of index_together to the target one.
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Input value of index_together must be a set of tuples.
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"""
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def __init__(self, name, index_together):
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self.name = name
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self.index_together = set(tuple(cons) for cons in index_together)
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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["index_together"] = self.index_together
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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old_app_cache = from_state.render()
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new_app_cache = to_state.render()
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old_model = old_app_cache.get_model(app_label, self.name)
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new_model = new_app_cache.get_model(app_label, self.name)
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if router.allow_migrate(schema_editor.connection.alias, new_model):
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schema_editor.alter_index_together(
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new_model,
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getattr(old_model._meta, "index_together", set()),
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getattr(new_model._meta, "index_together", set()),
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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 describe(self):
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return "Alter index_together for %s (%s constraints)" % (self.name, len(self.index_together))
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