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venv/Lib/site-packages/django/contrib/postgres/apps.py

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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, OrderBy, TextField
+from django.db.models.functions import Collate
+from django.db.models.indexes import IndexExpression
+from django.test.signals import setting_changed
+from django.utils.translation import gettext_lazy as _
+
+from .indexes import OpClass
+from .lookups import SearchLookup, TrigramSimilar, TrigramWordSimilar, 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)
+        CharField._unregister_lookup(TrigramWordSimilar)
+        TextField._unregister_lookup(TrigramWordSimilar)
+        # 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({
+                    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)
+        CharField.register_lookup(TrigramWordSimilar)
+        TextField.register_lookup(TrigramWordSimilar)
+        MigrationWriter.register_serializer(RANGE_TYPES, RangeSerializer)
+        IndexExpression.register_wrappers(OrderBy, OpClass, Collate)