app/django/db/backends/postgresql_psycopg2/introspection.py
author Lennard de Rijk <ljvderijk@gmail.com>
Tue, 28 Jul 2009 11:23:11 +0200
changeset 2685 506cda0463e8
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Added columns to the manage project page that show the amount of evaluations. The total possible amount of evaluations that is shown is based on surveys which have at least one Record.

from django.db.backends.postgresql.introspection import DatabaseIntrospection as PostgresDatabaseIntrospection

class DatabaseIntrospection(PostgresDatabaseIntrospection):

    def get_relations(self, cursor, table_name):
        """
        Returns a dictionary of {field_index: (field_index_other_table, other_table)}
        representing all relationships to the given table. Indexes are 0-based.
        """
        cursor.execute("""
            SELECT con.conkey, con.confkey, c2.relname
            FROM pg_constraint con, pg_class c1, pg_class c2
            WHERE c1.oid = con.conrelid
                AND c2.oid = con.confrelid
                AND c1.relname = %s
                AND con.contype = 'f'""", [table_name])
        relations = {}
        for row in cursor.fetchall():
            # row[0] and row[1] are single-item lists, so grab the single item.
            relations[row[0][0] - 1] = (row[1][0] - 1, row[2])
        return relations