334 lines
12 KiB
Python
334 lines
12 KiB
Python
from django.contrib.postgres.signals import (
|
|
get_citext_oids,
|
|
get_hstore_oids,
|
|
register_type_handlers,
|
|
)
|
|
from django.db import NotSupportedError, router
|
|
from django.db.migrations import AddConstraint, AddIndex, RemoveIndex
|
|
from django.db.migrations.operations.base import Operation
|
|
from django.db.models.constraints import CheckConstraint
|
|
|
|
|
|
class CreateExtension(Operation):
|
|
reversible = True
|
|
|
|
def __init__(self, name):
|
|
self.name = name
|
|
|
|
def state_forwards(self, app_label, state):
|
|
pass
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
if schema_editor.connection.vendor != "postgresql" or not router.allow_migrate(
|
|
schema_editor.connection.alias, app_label
|
|
):
|
|
return
|
|
if not self.extension_exists(schema_editor, self.name):
|
|
schema_editor.execute(
|
|
"CREATE EXTENSION IF NOT EXISTS %s"
|
|
% schema_editor.quote_name(self.name)
|
|
)
|
|
# Clear cached, stale oids.
|
|
get_hstore_oids.cache_clear()
|
|
get_citext_oids.cache_clear()
|
|
# Registering new type handlers cannot be done before the extension is
|
|
# installed, otherwise a subsequent data migration would use the same
|
|
# connection.
|
|
register_type_handlers(schema_editor.connection)
|
|
if hasattr(schema_editor.connection, "register_geometry_adapters"):
|
|
schema_editor.connection.register_geometry_adapters(
|
|
schema_editor.connection.connection, True
|
|
)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
if not router.allow_migrate(schema_editor.connection.alias, app_label):
|
|
return
|
|
if self.extension_exists(schema_editor, self.name):
|
|
schema_editor.execute(
|
|
"DROP EXTENSION IF EXISTS %s" % schema_editor.quote_name(self.name)
|
|
)
|
|
# Clear cached, stale oids.
|
|
get_hstore_oids.cache_clear()
|
|
get_citext_oids.cache_clear()
|
|
|
|
def extension_exists(self, schema_editor, extension):
|
|
with schema_editor.connection.cursor() as cursor:
|
|
cursor.execute(
|
|
"SELECT 1 FROM pg_extension WHERE extname = %s",
|
|
[extension],
|
|
)
|
|
return bool(cursor.fetchone())
|
|
|
|
def describe(self):
|
|
return "Creates extension %s" % self.name
|
|
|
|
@property
|
|
def migration_name_fragment(self):
|
|
return "create_extension_%s" % self.name
|
|
|
|
|
|
class BloomExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "bloom"
|
|
|
|
|
|
class BtreeGinExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "btree_gin"
|
|
|
|
|
|
class BtreeGistExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "btree_gist"
|
|
|
|
|
|
class CITextExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "citext"
|
|
|
|
|
|
class CryptoExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "pgcrypto"
|
|
|
|
|
|
class HStoreExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "hstore"
|
|
|
|
|
|
class TrigramExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "pg_trgm"
|
|
|
|
|
|
class UnaccentExtension(CreateExtension):
|
|
def __init__(self):
|
|
self.name = "unaccent"
|
|
|
|
|
|
class NotInTransactionMixin:
|
|
def _ensure_not_in_transaction(self, schema_editor):
|
|
if schema_editor.connection.in_atomic_block:
|
|
raise NotSupportedError(
|
|
"The %s operation cannot be executed inside a transaction "
|
|
"(set atomic = False on the migration)." % self.__class__.__name__
|
|
)
|
|
|
|
|
|
class AddIndexConcurrently(NotInTransactionMixin, AddIndex):
|
|
"""Create an index using PostgreSQL's CREATE INDEX CONCURRENTLY syntax."""
|
|
|
|
atomic = False
|
|
|
|
def describe(self):
|
|
return "Concurrently create index %s on field(s) %s of model %s" % (
|
|
self.index.name,
|
|
", ".join(self.index.fields),
|
|
self.model_name,
|
|
)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
self._ensure_not_in_transaction(schema_editor)
|
|
model = to_state.apps.get_model(app_label, self.model_name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
|
schema_editor.add_index(model, self.index, concurrently=True)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
self._ensure_not_in_transaction(schema_editor)
|
|
model = from_state.apps.get_model(app_label, self.model_name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
|
schema_editor.remove_index(model, self.index, concurrently=True)
|
|
|
|
|
|
class RemoveIndexConcurrently(NotInTransactionMixin, RemoveIndex):
|
|
"""Remove an index using PostgreSQL's DROP INDEX CONCURRENTLY syntax."""
|
|
|
|
atomic = False
|
|
|
|
def describe(self):
|
|
return "Concurrently remove index %s from %s" % (self.name, self.model_name)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
self._ensure_not_in_transaction(schema_editor)
|
|
model = from_state.apps.get_model(app_label, self.model_name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
|
from_model_state = from_state.models[app_label, self.model_name_lower]
|
|
index = from_model_state.get_index_by_name(self.name)
|
|
schema_editor.remove_index(model, index, concurrently=True)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
self._ensure_not_in_transaction(schema_editor)
|
|
model = to_state.apps.get_model(app_label, self.model_name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
|
to_model_state = to_state.models[app_label, self.model_name_lower]
|
|
index = to_model_state.get_index_by_name(self.name)
|
|
schema_editor.add_index(model, index, concurrently=True)
|
|
|
|
|
|
class CollationOperation(Operation):
|
|
def __init__(self, name, locale, *, provider="libc", deterministic=True):
|
|
self.name = name
|
|
self.locale = locale
|
|
self.provider = provider
|
|
self.deterministic = deterministic
|
|
|
|
def state_forwards(self, app_label, state):
|
|
pass
|
|
|
|
def deconstruct(self):
|
|
kwargs = {"name": self.name, "locale": self.locale}
|
|
if self.provider and self.provider != "libc":
|
|
kwargs["provider"] = self.provider
|
|
if self.deterministic is False:
|
|
kwargs["deterministic"] = self.deterministic
|
|
return (
|
|
self.__class__.__qualname__,
|
|
[],
|
|
kwargs,
|
|
)
|
|
|
|
def create_collation(self, schema_editor):
|
|
args = {"locale": schema_editor.quote_name(self.locale)}
|
|
if self.provider != "libc":
|
|
args["provider"] = schema_editor.quote_name(self.provider)
|
|
if self.deterministic is False:
|
|
args["deterministic"] = "false"
|
|
schema_editor.execute(
|
|
"CREATE COLLATION %(name)s (%(args)s)"
|
|
% {
|
|
"name": schema_editor.quote_name(self.name),
|
|
"args": ", ".join(
|
|
f"{option}={value}" for option, value in args.items()
|
|
),
|
|
}
|
|
)
|
|
|
|
def remove_collation(self, schema_editor):
|
|
schema_editor.execute(
|
|
"DROP COLLATION %s" % schema_editor.quote_name(self.name),
|
|
)
|
|
|
|
|
|
class CreateCollation(CollationOperation):
|
|
"""Create a collation."""
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
if schema_editor.connection.vendor != "postgresql" or not router.allow_migrate(
|
|
schema_editor.connection.alias, app_label
|
|
):
|
|
return
|
|
self.create_collation(schema_editor)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
if not router.allow_migrate(schema_editor.connection.alias, app_label):
|
|
return
|
|
self.remove_collation(schema_editor)
|
|
|
|
def describe(self):
|
|
return f"Create collation {self.name}"
|
|
|
|
@property
|
|
def migration_name_fragment(self):
|
|
return "create_collation_%s" % self.name.lower()
|
|
|
|
|
|
class RemoveCollation(CollationOperation):
|
|
"""Remove a collation."""
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
if schema_editor.connection.vendor != "postgresql" or not router.allow_migrate(
|
|
schema_editor.connection.alias, app_label
|
|
):
|
|
return
|
|
self.remove_collation(schema_editor)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
if not router.allow_migrate(schema_editor.connection.alias, app_label):
|
|
return
|
|
self.create_collation(schema_editor)
|
|
|
|
def describe(self):
|
|
return f"Remove collation {self.name}"
|
|
|
|
@property
|
|
def migration_name_fragment(self):
|
|
return "remove_collation_%s" % self.name.lower()
|
|
|
|
|
|
class AddConstraintNotValid(AddConstraint):
|
|
"""
|
|
Add a table constraint without enforcing validation, using PostgreSQL's
|
|
NOT VALID syntax.
|
|
"""
|
|
|
|
def __init__(self, model_name, constraint):
|
|
if not isinstance(constraint, CheckConstraint):
|
|
raise TypeError(
|
|
"AddConstraintNotValid.constraint must be a check constraint."
|
|
)
|
|
super().__init__(model_name, constraint)
|
|
|
|
def describe(self):
|
|
return "Create not valid constraint %s on model %s" % (
|
|
self.constraint.name,
|
|
self.model_name,
|
|
)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
model = from_state.apps.get_model(app_label, self.model_name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
|
constraint_sql = self.constraint.create_sql(model, schema_editor)
|
|
if constraint_sql:
|
|
# Constraint.create_sql returns interpolated SQL which makes
|
|
# params=None a necessity to avoid escaping attempts on
|
|
# execution.
|
|
schema_editor.execute(str(constraint_sql) + " NOT VALID", params=None)
|
|
|
|
@property
|
|
def migration_name_fragment(self):
|
|
return super().migration_name_fragment + "_not_valid"
|
|
|
|
|
|
class ValidateConstraint(Operation):
|
|
"""Validate a table NOT VALID constraint."""
|
|
|
|
def __init__(self, model_name, name):
|
|
self.model_name = model_name
|
|
self.name = name
|
|
|
|
def describe(self):
|
|
return "Validate constraint %s on model %s" % (self.name, self.model_name)
|
|
|
|
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
|
model = from_state.apps.get_model(app_label, self.model_name)
|
|
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
|
schema_editor.execute(
|
|
"ALTER TABLE %s VALIDATE CONSTRAINT %s"
|
|
% (
|
|
schema_editor.quote_name(model._meta.db_table),
|
|
schema_editor.quote_name(self.name),
|
|
)
|
|
)
|
|
|
|
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
|
# PostgreSQL does not provide a way to make a constraint invalid.
|
|
pass
|
|
|
|
def state_forwards(self, app_label, state):
|
|
pass
|
|
|
|
@property
|
|
def migration_name_fragment(self):
|
|
return "%s_validate_%s" % (self.model_name.lower(), self.name.lower())
|
|
|
|
def deconstruct(self):
|
|
return (
|
|
self.__class__.__name__,
|
|
[],
|
|
{
|
|
"model_name": self.model_name,
|
|
"name": self.name,
|
|
},
|
|
)
|