django1/django/db/backends/postgresql/features.py

from django.db.backends.base.features import BaseDatabaseFeatures
from django.db.utils import InterfaceError
from django.utils.functional import cached_property


class DatabaseFeatures(BaseDatabaseFeatures):
    allows_group_by_selected_pks = True
    can_return_id_from_insert = True
    can_return_ids_from_bulk_insert = True
    has_real_datatype = True
    has_native_uuid_field = True
    has_native_duration_field = True
    can_defer_constraint_checks = True
    has_select_for_update = True
    has_select_for_update_nowait = True
    has_bulk_insert = True
    uses_savepoints = True
    can_release_savepoints = True
    supports_tablespaces = True
    supports_transactions = True
    can_introspect_autofield = True
    can_introspect_ip_address_field = True
    can_introspect_small_integer_field = True
    can_distinct_on_fields = True
    can_rollback_ddl = True
    supports_combined_alters = True
    nulls_order_largest = True
    closed_cursor_error_class = InterfaceError
    has_case_insensitive_like = False
    requires_sqlparse_for_splitting = False
    greatest_least_ignores_nulls = True
    can_clone_databases = True
    supports_temporal_subtraction = True
    supports_slicing_ordering_in_compound = True

    @cached_property
    def has_select_for_update_skip_locked(self):
        return self.connection.pg_version >= 90500

    @cached_property
    def has_jsonb_datatype(self):
        return self.connection.pg_version >= 90400

    @cached_property
    def has_jsonb_agg(self):
        return self.connection.pg_version >= 90500