305 lines
12 KiB
Python
305 lines
12 KiB
Python
import datetime
|
|
import importlib
|
|
import os
|
|
import sys
|
|
|
|
from django.apps import apps
|
|
from django.db.models import NOT_PROVIDED
|
|
from django.utils import timezone
|
|
from django.utils.version import get_docs_version
|
|
|
|
from .loader import MigrationLoader
|
|
|
|
|
|
class MigrationQuestioner:
|
|
"""
|
|
Give 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, _ = MigrationLoader.migrations_module(app_config.label)
|
|
if migrations_import_path is None:
|
|
# It's an application with migrations disabled.
|
|
return self.defaults.get("ask_initial", False)
|
|
try:
|
|
migrations_module = importlib.import_module(migrations_import_path)
|
|
except ImportError:
|
|
return self.defaults.get("ask_initial", False)
|
|
else:
|
|
if getattr(migrations_module, "__file__", None):
|
|
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_not_null_alteration(self, field_name, model_name):
|
|
"""Changing a NULL field to NOT NULL."""
|
|
# 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):
|
|
"""Should these migrations really be merged?"""
|
|
return self.defaults.get("ask_merge", False)
|
|
|
|
def ask_auto_now_add_addition(self, field_name, model_name):
|
|
"""Adding an auto_now_add field to a model."""
|
|
# None means quit
|
|
return None
|
|
|
|
def ask_unique_callable_default_addition(self, field_name, model_name):
|
|
"""Adding a unique field with a callable default."""
|
|
# None means continue.
|
|
return None
|
|
|
|
|
|
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 not result 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)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
if 0 < value <= len(choices):
|
|
return value
|
|
result = input("Please select a valid option: ")
|
|
|
|
def _ask_default(self, default=''):
|
|
"""
|
|
Prompt for a default value.
|
|
|
|
The ``default`` argument allows providing a custom default value (as a
|
|
string) which will be shown to the user and used as the return value
|
|
if the user doesn't provide any other input.
|
|
"""
|
|
print('Please enter the default value as valid Python.')
|
|
if default:
|
|
print(
|
|
f"Accept the default '{default}' by pressing 'Enter' or "
|
|
f"provide another value."
|
|
)
|
|
print(
|
|
'The datetime and django.utils.timezone modules are available, so '
|
|
'it is possible to provide e.g. timezone.now as a value.'
|
|
)
|
|
print("Type 'exit' to exit this prompt")
|
|
while True:
|
|
if default:
|
|
prompt = "[default: {}] >>> ".format(default)
|
|
else:
|
|
prompt = ">>> "
|
|
code = input(prompt)
|
|
if not code and default:
|
|
code = default
|
|
if not code:
|
|
print("Please enter some code, or 'exit' (without quotes) to exit.")
|
|
elif code == "exit":
|
|
sys.exit(1)
|
|
else:
|
|
try:
|
|
return eval(code, {}, {'datetime': datetime, 'timezone': timezone})
|
|
except (SyntaxError, NameError) as e:
|
|
print("Invalid input: %s" % e)
|
|
|
|
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(
|
|
f"It is impossible to add a non-nullable field '{field_name}' "
|
|
f"to {model_name} without specifying a default. This is "
|
|
f"because the database needs something to populate existing "
|
|
f"rows.\n"
|
|
f"Please select a fix:",
|
|
[
|
|
("Provide a one-off default now (will be set on all existing "
|
|
"rows with a null value for this column)"),
|
|
'Quit and manually define a default value in models.py.',
|
|
]
|
|
)
|
|
if choice == 2:
|
|
sys.exit(3)
|
|
else:
|
|
return self._ask_default()
|
|
return None
|
|
|
|
def ask_not_null_alteration(self, field_name, model_name):
|
|
"""Changing a NULL field to NOT NULL."""
|
|
if not self.dry_run:
|
|
choice = self._choice_input(
|
|
f"It is impossible to change a nullable field '{field_name}' "
|
|
f"on {model_name} to non-nullable without providing a "
|
|
f"default. This is because the database needs something to "
|
|
f"populate existing rows.\n"
|
|
f"Please select a fix:",
|
|
[
|
|
("Provide a one-off default now (will be set on all existing "
|
|
"rows with a null value for this column)"),
|
|
'Ignore for now. Existing rows that contain NULL values '
|
|
'will have to be handled manually, for example with a '
|
|
'RunPython or RunSQL operation.',
|
|
'Quit and manually define a default value in models.py.',
|
|
]
|
|
)
|
|
if choice == 2:
|
|
return NOT_PROVIDED
|
|
elif choice == 3:
|
|
sys.exit(3)
|
|
else:
|
|
return self._ask_default()
|
|
return None
|
|
|
|
def ask_rename(self, model_name, old_name, new_name, field_instance):
|
|
"""Was this field really renamed?"""
|
|
msg = 'Was %s.%s renamed to %s.%s (a %s)? [y/N]'
|
|
return self._boolean_input(msg % (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?"""
|
|
msg = 'Was the model %s.%s renamed to %s? [y/N]'
|
|
return self._boolean_input(msg % (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" +
|
|
'Should these migration branches be merged? [y/N]',
|
|
False,
|
|
)
|
|
|
|
def ask_auto_now_add_addition(self, field_name, model_name):
|
|
"""Adding an auto_now_add field to a model."""
|
|
if not self.dry_run:
|
|
choice = self._choice_input(
|
|
f"It is impossible to add the field '{field_name}' with "
|
|
f"'auto_now_add=True' to {model_name} without providing a "
|
|
f"default. This is because the database needs something to "
|
|
f"populate existing rows.\n",
|
|
[
|
|
'Provide a one-off default now which will be set on all '
|
|
'existing rows',
|
|
'Quit and manually define a default value in models.py.',
|
|
]
|
|
)
|
|
if choice == 2:
|
|
sys.exit(3)
|
|
else:
|
|
return self._ask_default(default='timezone.now')
|
|
return None
|
|
|
|
def ask_unique_callable_default_addition(self, field_name, model_name):
|
|
"""Adding a unique field with a callable default."""
|
|
if not self.dry_run:
|
|
version = get_docs_version()
|
|
choice = self._choice_input(
|
|
f'Callable default on unique field {model_name}.{field_name} '
|
|
f'will not generate unique values upon migrating.\n'
|
|
f'Please choose how to proceed:\n',
|
|
[
|
|
f'Continue making this migration as the first step in '
|
|
f'writing a manual migration to generate unique values '
|
|
f'described here: '
|
|
f'https://docs.djangoproject.com/en/{version}/howto/'
|
|
f'writing-migrations/#migrations-that-add-unique-fields.',
|
|
'Quit and edit field options in models.py.',
|
|
],
|
|
)
|
|
if choice == 2:
|
|
sys.exit(3)
|
|
return None
|
|
|
|
|
|
class NonInteractiveMigrationQuestioner(MigrationQuestioner):
|
|
def __init__(
|
|
self, defaults=None, specified_apps=None, dry_run=None, verbosity=1,
|
|
log=None,
|
|
):
|
|
self.verbosity = verbosity
|
|
self.log = log
|
|
super().__init__(
|
|
defaults=defaults, specified_apps=specified_apps, dry_run=dry_run,
|
|
)
|
|
|
|
def log_lack_of_migration(self, field_name, model_name, reason):
|
|
if self.verbosity > 0:
|
|
self.log(
|
|
f"Field '{field_name}' on model '{model_name}' not migrated: "
|
|
f"{reason}."
|
|
)
|
|
|
|
def ask_not_null_addition(self, field_name, model_name):
|
|
# We can't ask the user, so act like the user aborted.
|
|
self.log_lack_of_migration(
|
|
field_name,
|
|
model_name,
|
|
'it is impossible to add a non-nullable field without specifying '
|
|
'a default',
|
|
)
|
|
sys.exit(3)
|
|
|
|
def ask_not_null_alteration(self, field_name, model_name):
|
|
# We can't ask the user, so set as not provided.
|
|
self.log(
|
|
f"Field '{field_name}' on model '{model_name}' given a default of "
|
|
f"NOT PROVIDED and must be corrected."
|
|
)
|
|
return NOT_PROVIDED
|
|
|
|
def ask_auto_now_add_addition(self, field_name, model_name):
|
|
# We can't ask the user, so act like the user aborted.
|
|
self.log_lack_of_migration(
|
|
field_name,
|
|
model_name,
|
|
"it is impossible to add a field with 'auto_now_add=True' without "
|
|
"specifying a default",
|
|
)
|
|
sys.exit(3)
|