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from psycopg2.extras import (
DateRange, DateTimeRange, DateTimeTZRange, NumericRange,
)
from django.apps import AppConfig
from django.db import connections
from django.db.backends.signals import connection_created
from django.db.migrations.writer import MigrationWriter
from django.db.models import CharField, TextField
from django.test.signals import setting_changed
from django.utils.translation import gettext_lazy as _
from .lookups import SearchLookup, TrigramSimilar, Unaccent
from .serializers import RangeSerializer
from .signals import register_type_handlers
RANGE_TYPES = (DateRange, DateTimeRange, DateTimeTZRange, NumericRange)
def uninstall_if_needed(setting, value, enter, **kwargs):
"""
Undo the effects of PostgresConfig.ready() when django.contrib.postgres
is "uninstalled" by override_settings().
"""
if not enter and setting == 'INSTALLED_APPS' and 'django.contrib.postgres' not in set(value):
connection_created.disconnect(register_type_handlers)
CharField._unregister_lookup(Unaccent)
TextField._unregister_lookup(Unaccent)
CharField._unregister_lookup(SearchLookup)
TextField._unregister_lookup(SearchLookup)
CharField._unregister_lookup(TrigramSimilar)
TextField._unregister_lookup(TrigramSimilar)
# Disconnect this receiver until the next time this app is installed
# and ready() connects it again to prevent unnecessary processing on
# each setting change.
setting_changed.disconnect(uninstall_if_needed)
MigrationWriter.unregister_serializer(RANGE_TYPES)
class PostgresConfig(AppConfig):
name = 'django.contrib.postgres'
verbose_name = _('PostgreSQL extensions')
def ready(self):
setting_changed.connect(uninstall_if_needed)
# Connections may already exist before we are called.
for conn in connections.all():
if conn.vendor == 'postgresql':
conn.introspection.data_types_reverse.update({
3802: 'django.contrib.postgres.fields.JSONField',
3904: 'django.contrib.postgres.fields.IntegerRangeField',
3906: 'django.contrib.postgres.fields.DecimalRangeField',
3910: 'django.contrib.postgres.fields.DateTimeRangeField',
3912: 'django.contrib.postgres.fields.DateRangeField',
3926: 'django.contrib.postgres.fields.BigIntegerRangeField',
})
if conn.connection is not None:
register_type_handlers(conn)
connection_created.connect(register_type_handlers)
CharField.register_lookup(Unaccent)
TextField.register_lookup(Unaccent)
CharField.register_lookup(SearchLookup)
TextField.register_lookup(SearchLookup)
CharField.register_lookup(TrigramSimilar)
TextField.register_lookup(TrigramSimilar)
MigrationWriter.register_serializer(RANGE_TYPES, RangeSerializer)
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