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from django.contrib.postgres.signals import (
get_citext_oids, get_hstore_oids, register_type_handlers,
)
from django.db.migrations.operations.base import Operation
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':
return
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)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
schema_editor.execute("DROP EXTENSION %s" % schema_editor.quote_name(self.name))
# Clear cached, stale oids.
get_hstore_oids.cache_clear()
get_citext_oids.cache_clear()
def describe(self):
return "Creates extension %s" % self.name
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'