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138 lines
4.7 KiB
Python
138 lines
4.7 KiB
Python
from django.contrib.postgres.signals import (
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get_citext_oids, get_hstore_oids, register_type_handlers,
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)
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from django.db.migrations import AddIndex, RemoveIndex
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from django.db.migrations.operations.base import Operation
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from django.db.utils import NotSupportedError
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class CreateExtension(Operation):
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reversible = True
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def __init__(self, name):
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self.name = name
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def state_forwards(self, app_label, state):
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pass
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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if schema_editor.connection.vendor != 'postgresql':
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return
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schema_editor.execute("CREATE EXTENSION IF NOT EXISTS %s" % schema_editor.quote_name(self.name))
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# Clear cached, stale oids.
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get_hstore_oids.cache_clear()
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get_citext_oids.cache_clear()
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# Registering new type handlers cannot be done before the extension is
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# installed, otherwise a subsequent data migration would use the same
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# connection.
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register_type_handlers(schema_editor.connection)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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schema_editor.execute("DROP EXTENSION %s" % schema_editor.quote_name(self.name))
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# Clear cached, stale oids.
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get_hstore_oids.cache_clear()
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get_citext_oids.cache_clear()
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def describe(self):
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return "Creates extension %s" % self.name
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class BtreeGinExtension(CreateExtension):
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def __init__(self):
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self.name = 'btree_gin'
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class BtreeGistExtension(CreateExtension):
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def __init__(self):
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self.name = 'btree_gist'
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class CITextExtension(CreateExtension):
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def __init__(self):
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self.name = 'citext'
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class CryptoExtension(CreateExtension):
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def __init__(self):
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self.name = 'pgcrypto'
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class HStoreExtension(CreateExtension):
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def __init__(self):
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self.name = 'hstore'
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class TrigramExtension(CreateExtension):
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def __init__(self):
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self.name = 'pg_trgm'
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class UnaccentExtension(CreateExtension):
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def __init__(self):
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self.name = 'unaccent'
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class NotInTransactionMixin:
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def _ensure_not_in_transaction(self, schema_editor):
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if schema_editor.connection.in_atomic_block:
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raise NotSupportedError(
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'The %s operation cannot be executed inside a transaction '
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'(set atomic = False on the migration).'
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% self.__class__.__name__
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)
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class AddIndexConcurrently(NotInTransactionMixin, AddIndex):
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"""Create an index using PostgreSQL's CREATE INDEX CONCURRENTLY syntax."""
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atomic = False
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def describe(self):
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return 'Concurrently create index %s on field(s) %s of model %s' % (
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self.index.name,
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', '.join(self.index.fields),
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self.model_name,
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)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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self._ensure_not_in_transaction(schema_editor)
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model = to_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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schema_editor.add_index(model, self.index, concurrently=True)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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self._ensure_not_in_transaction(schema_editor)
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model = from_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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schema_editor.remove_index(model, self.index, concurrently=True)
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class RemoveIndexConcurrently(NotInTransactionMixin, RemoveIndex):
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"""Remove an index using PostgreSQL's DROP INDEX CONCURRENTLY syntax."""
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atomic = False
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def describe(self):
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return 'Concurrently remove index %s from %s' % (self.name, self.model_name)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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self._ensure_not_in_transaction(schema_editor)
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model = from_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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from_model_state = from_state.models[app_label, self.model_name_lower]
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index = from_model_state.get_index_by_name(self.name)
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schema_editor.remove_index(model, index, concurrently=True)
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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self._ensure_not_in_transaction(schema_editor)
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model = to_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, model):
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to_model_state = to_state.models[app_label, self.model_name_lower]
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index = to_model_state.get_index_by_name(self.name)
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schema_editor.add_index(model, index, concurrently=True)
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