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venv/Lib/site-packages/django/db/migrations/questioner.py
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245
venv/Lib/site-packages/django/db/migrations/questioner.py
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import datetime
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import importlib
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import os
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import sys
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from django.apps import apps
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from django.db.models import NOT_PROVIDED
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from django.utils import timezone
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from .loader import MigrationLoader
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class MigrationQuestioner:
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"""
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Give the autodetector responses to questions it might have.
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This base class has a built-in noninteractive mode, but the
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interactive subclass is what the command-line arguments will use.
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"""
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def __init__(self, defaults=None, specified_apps=None, dry_run=None):
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self.defaults = defaults or {}
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self.specified_apps = specified_apps or set()
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self.dry_run = dry_run
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def ask_initial(self, app_label):
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"""Should we create an initial migration for the app?"""
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# If it was specified on the command line, definitely true
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if app_label in self.specified_apps:
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return True
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# Otherwise, we look to see if it has a migrations module
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# without any Python files in it, apart from __init__.py.
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# Apps from the new app template will have these; the Python
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# file check will ensure we skip South ones.
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try:
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app_config = apps.get_app_config(app_label)
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except LookupError: # It's a fake app.
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return self.defaults.get("ask_initial", False)
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migrations_import_path, _ = MigrationLoader.migrations_module(app_config.label)
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if migrations_import_path is None:
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# It's an application with migrations disabled.
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return self.defaults.get("ask_initial", False)
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try:
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migrations_module = importlib.import_module(migrations_import_path)
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except ImportError:
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return self.defaults.get("ask_initial", False)
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else:
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if getattr(migrations_module, "__file__", None):
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filenames = os.listdir(os.path.dirname(migrations_module.__file__))
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elif hasattr(migrations_module, "__path__"):
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if len(migrations_module.__path__) > 1:
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return False
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filenames = os.listdir(list(migrations_module.__path__)[0])
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return not any(x.endswith(".py") for x in filenames if x != "__init__.py")
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def ask_not_null_addition(self, field_name, model_name):
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"""Adding a NOT NULL field to a model."""
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# None means quit
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return None
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def ask_not_null_alteration(self, field_name, model_name):
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"""Changing a NULL field to NOT NULL."""
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# None means quit
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return None
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def ask_rename(self, model_name, old_name, new_name, field_instance):
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"""Was this field really renamed?"""
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return self.defaults.get("ask_rename", False)
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def ask_rename_model(self, old_model_state, new_model_state):
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"""Was this model really renamed?"""
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return self.defaults.get("ask_rename_model", False)
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def ask_merge(self, app_label):
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"""Should these migrations really be merged?"""
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return self.defaults.get("ask_merge", False)
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def ask_auto_now_add_addition(self, field_name, model_name):
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"""Adding an auto_now_add field to a model."""
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# None means quit
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return None
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class InteractiveMigrationQuestioner(MigrationQuestioner):
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def _boolean_input(self, question, default=None):
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result = input("%s " % question)
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if not result and default is not None:
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return default
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while not result or result[0].lower() not in "yn":
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result = input("Please answer yes or no: ")
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return result[0].lower() == "y"
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def _choice_input(self, question, choices):
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print(question)
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for i, choice in enumerate(choices):
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print(" %s) %s" % (i + 1, choice))
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result = input("Select an option: ")
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while True:
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try:
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value = int(result)
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except ValueError:
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pass
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else:
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if 0 < value <= len(choices):
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return value
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result = input("Please select a valid option: ")
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def _ask_default(self, default=''):
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"""
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Prompt for a default value.
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The ``default`` argument allows providing a custom default value (as a
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string) which will be shown to the user and used as the return value
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if the user doesn't provide any other input.
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"""
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print('Please enter the default value as valid Python.')
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if default:
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print(
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f"Accept the default '{default}' by pressing 'Enter' or "
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f"provide another value."
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)
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print(
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'The datetime and django.utils.timezone modules are available, so '
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'it is possible to provide e.g. timezone.now as a value.'
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)
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print("Type 'exit' to exit this prompt")
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while True:
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if default:
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prompt = "[default: {}] >>> ".format(default)
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else:
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prompt = ">>> "
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code = input(prompt)
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if not code and default:
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code = default
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if not code:
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print("Please enter some code, or 'exit' (without quotes) to exit.")
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elif code == "exit":
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sys.exit(1)
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else:
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try:
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return eval(code, {}, {'datetime': datetime, 'timezone': timezone})
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except (SyntaxError, NameError) as e:
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print("Invalid input: %s" % e)
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def ask_not_null_addition(self, field_name, model_name):
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"""Adding a NOT NULL field to a model."""
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if not self.dry_run:
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choice = self._choice_input(
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f"It is impossible to add a non-nullable field '{field_name}' "
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f"to {model_name} without specifying a default. This is "
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f"because the database needs something to populate existing "
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f"rows.\n"
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f"Please select a fix:",
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[
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("Provide a one-off default now (will be set on all existing "
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"rows with a null value for this column)"),
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'Quit and manually define a default value in models.py.',
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]
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)
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if choice == 2:
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sys.exit(3)
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else:
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return self._ask_default()
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return None
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def ask_not_null_alteration(self, field_name, model_name):
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"""Changing a NULL field to NOT NULL."""
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if not self.dry_run:
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choice = self._choice_input(
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f"It is impossible to change a nullable field '{field_name}' "
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f"on {model_name} to non-nullable without providing a "
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f"default. This is because the database needs something to "
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f"populate existing rows.\n"
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f"Please select a fix:",
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[
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("Provide a one-off default now (will be set on all existing "
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"rows with a null value for this column)"),
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'Ignore for now. Existing rows that contain NULL values '
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'will have to be handled manually, for example with a '
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'RunPython or RunSQL operation.',
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'Quit and manually define a default value in models.py.',
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]
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)
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if choice == 2:
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return NOT_PROVIDED
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elif choice == 3:
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sys.exit(3)
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else:
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return self._ask_default()
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return None
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def ask_rename(self, model_name, old_name, new_name, field_instance):
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"""Was this field really renamed?"""
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msg = 'Was %s.%s renamed to %s.%s (a %s)? [y/N]'
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return self._boolean_input(msg % (model_name, old_name, model_name, new_name,
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field_instance.__class__.__name__), False)
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def ask_rename_model(self, old_model_state, new_model_state):
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"""Was this model really renamed?"""
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msg = 'Was the model %s.%s renamed to %s? [y/N]'
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return self._boolean_input(msg % (old_model_state.app_label, old_model_state.name,
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new_model_state.name), False)
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def ask_merge(self, app_label):
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return self._boolean_input(
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"\nMerging will only work if the operations printed above do not conflict\n" +
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"with each other (working on different fields or models)\n" +
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'Should these migration branches be merged? [y/N]',
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False,
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)
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def ask_auto_now_add_addition(self, field_name, model_name):
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"""Adding an auto_now_add field to a model."""
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if not self.dry_run:
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choice = self._choice_input(
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f"It is impossible to add the field '{field_name}' with "
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f"'auto_now_add=True' to {model_name} without providing a "
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f"default. This is because the database needs something to "
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f"populate existing rows.\n",
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[
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'Provide a one-off default now which will be set on all '
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'existing rows',
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'Quit and manually define a default value in models.py.',
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]
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)
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if choice == 2:
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sys.exit(3)
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else:
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return self._ask_default(default='timezone.now')
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return None
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class NonInteractiveMigrationQuestioner(MigrationQuestioner):
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def ask_not_null_addition(self, field_name, model_name):
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# We can't ask the user, so act like the user aborted.
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sys.exit(3)
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def ask_not_null_alteration(self, field_name, model_name):
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# We can't ask the user, so set as not provided.
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return NOT_PROVIDED
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def ask_auto_now_add_addition(self, field_name, model_name):
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# We can't ask the user, so act like the user aborted.
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sys.exit(3)
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