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240 lines
9.7 KiB
Python
240 lines
9.7 KiB
Python
5 years ago
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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.fields 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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# getattr() needed on PY36 and older (replace with attribute access).
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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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"""Do you really want to merge these migrations?"""
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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 now, as valid Python")
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if default:
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print(
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"You can accept the default '{}' by pressing 'Enter' or you "
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"can provide another value.".format(default)
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)
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print("The datetime and django.utils.timezone modules are available, so you can do e.g. timezone.now")
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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' (with no 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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"You are trying to add a non-nullable field '%s' to %s without a default; "
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"we can't do that (the database needs something to populate existing rows).\n"
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"Please select a fix:" % (field_name, model_name),
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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 let me add a default 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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"You are trying to change the nullable field '%s' on %s to non-nullable "
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"without a default; we can't do that (the database needs something to "
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"populate existing rows).\n"
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"Please select a fix:" % (field_name, model_name),
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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, and let me handle existing rows with NULL myself "
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"(e.g. because you added a RunPython or RunSQL operation to handle "
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"NULL values in a previous data migration)"),
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"Quit, and let me add a default 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 = "Did you rename %s.%s 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 = "Did you rename the %s.%s model 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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"Do you want to merge these migration branches? [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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"You are trying to add the field '{}' with 'auto_now_add=True' "
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"to {} without a default; the database needs something to "
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"populate existing rows.\n".format(field_name, model_name),
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[
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"Provide a one-off default now (will be set on all "
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"existing rows)",
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"Quit, and let me add a default 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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