146 lines
6.1 KiB
Python
146 lines
6.1 KiB
Python
from __future__ import unicode_literals
|
|
|
|
import importlib
|
|
import os
|
|
import sys
|
|
|
|
from django.apps import apps
|
|
from django.utils import datetime_safe, six
|
|
from django.utils.six.moves import input
|
|
|
|
from .loader import MIGRATIONS_MODULE_NAME
|
|
|
|
|
|
class MigrationQuestioner(object):
|
|
"""
|
|
Gives the autodetector responses to questions it might have.
|
|
This base class has a built-in noninteractive mode, but the
|
|
interactive subclass is what the command-line arguments will use.
|
|
"""
|
|
|
|
def __init__(self, defaults=None, specified_apps=None, dry_run=None):
|
|
self.defaults = defaults or {}
|
|
self.specified_apps = specified_apps or set()
|
|
self.dry_run = dry_run
|
|
|
|
def ask_initial(self, app_label):
|
|
"Should we create an initial migration for the app?"
|
|
# If it was specified on the command line, definitely true
|
|
if app_label in self.specified_apps:
|
|
return True
|
|
# Otherwise, we look to see if it has a migrations module
|
|
# without any Python files in it, apart from __init__.py.
|
|
# Apps from the new app template will have these; the python
|
|
# file check will ensure we skip South ones.
|
|
try:
|
|
app_config = apps.get_app_config(app_label)
|
|
except LookupError: # It's a fake app.
|
|
return self.defaults.get("ask_initial", False)
|
|
migrations_import_path = "%s.%s" % (app_config.name, MIGRATIONS_MODULE_NAME)
|
|
try:
|
|
migrations_module = importlib.import_module(migrations_import_path)
|
|
except ImportError:
|
|
return self.defaults.get("ask_initial", False)
|
|
else:
|
|
if hasattr(migrations_module, "__file__"):
|
|
filenames = os.listdir(os.path.dirname(migrations_module.__file__))
|
|
elif hasattr(migrations_module, "__path__"):
|
|
if len(migrations_module.__path__) > 1:
|
|
return False
|
|
filenames = os.listdir(list(migrations_module.__path__)[0])
|
|
return not any(x.endswith(".py") for x in filenames if x != "__init__.py")
|
|
|
|
def ask_not_null_addition(self, field_name, model_name):
|
|
"Adding a NOT NULL field to a model"
|
|
# None means quit
|
|
return None
|
|
|
|
def ask_rename(self, model_name, old_name, new_name, field_instance):
|
|
"Was this field really renamed?"
|
|
return self.defaults.get("ask_rename", False)
|
|
|
|
def ask_rename_model(self, old_model_state, new_model_state):
|
|
"Was this model really renamed?"
|
|
return self.defaults.get("ask_rename_model", False)
|
|
|
|
def ask_merge(self, app_label):
|
|
"Do you really want to merge these migrations?"
|
|
return self.defaults.get("ask_merge", False)
|
|
|
|
|
|
class InteractiveMigrationQuestioner(MigrationQuestioner):
|
|
|
|
def _boolean_input(self, question, default=None):
|
|
result = input("%s " % question)
|
|
if not result and default is not None:
|
|
return default
|
|
while len(result) < 1 or result[0].lower() not in "yn":
|
|
result = input("Please answer yes or no: ")
|
|
return result[0].lower() == "y"
|
|
|
|
def _choice_input(self, question, choices):
|
|
print(question)
|
|
for i, choice in enumerate(choices):
|
|
print(" %s) %s" % (i + 1, choice))
|
|
result = input("Select an option: ")
|
|
while True:
|
|
try:
|
|
value = int(result)
|
|
if 0 < value <= len(choices):
|
|
return value
|
|
except ValueError:
|
|
pass
|
|
result = input("Please select a valid option: ")
|
|
|
|
def ask_not_null_addition(self, field_name, model_name):
|
|
"Adding a NOT NULL field to a model"
|
|
if not self.dry_run:
|
|
choice = self._choice_input(
|
|
"You are trying to add a non-nullable field '%s' to %s without a default;\n" % (field_name, model_name) +
|
|
"we can't do that (the database needs something to populate existing rows).\n" +
|
|
"Please select a fix:",
|
|
[
|
|
"Provide a one-off default now (will be set on all existing rows)",
|
|
"Quit, and let me add a default in models.py",
|
|
]
|
|
)
|
|
if choice == 2:
|
|
sys.exit(3)
|
|
else:
|
|
print("Please enter the default value now, as valid Python")
|
|
print("The datetime module is available, so you can do e.g. datetime.date.today()")
|
|
while True:
|
|
if six.PY3:
|
|
# Six does not correctly abstract over the fact that
|
|
# py3 input returns a unicode string, while py2 raw_input
|
|
# returns a bytestring.
|
|
code = input(">>> ")
|
|
else:
|
|
code = input(">>> ").decode(sys.stdin.encoding)
|
|
if not code:
|
|
print("Please enter some code, or 'exit' (with no quotes) to exit.")
|
|
elif code == "exit":
|
|
sys.exit(1)
|
|
else:
|
|
try:
|
|
return eval(code, {}, {"datetime": datetime_safe})
|
|
except (SyntaxError, NameError) as e:
|
|
print("Invalid input: %s" % e)
|
|
return None
|
|
|
|
def ask_rename(self, model_name, old_name, new_name, field_instance):
|
|
"Was this field really renamed?"
|
|
return self._boolean_input("Did you rename %s.%s to %s.%s (a %s)? [y/N]" % (model_name, old_name, model_name, new_name, field_instance.__class__.__name__), False)
|
|
|
|
def ask_rename_model(self, old_model_state, new_model_state):
|
|
"Was this model really renamed?"
|
|
return self._boolean_input("Did you rename the %s.%s model to %s? [y/N]" % (old_model_state.app_label, old_model_state.name, new_model_state.name), False)
|
|
|
|
def ask_merge(self, app_label):
|
|
return self._boolean_input(
|
|
"\nMerging will only work if the operations printed above do not conflict\n" +
|
|
"with each other (working on different fields or models)\n" +
|
|
"Do you want to merge these migration branches? [y/N]",
|
|
False,
|
|
)
|