1 def execute_safely(manager, statement):  argument
3         manager.execute(statement)
8 def delete_duplicates(manager, table, first_id, second_id):  argument
9     rows = manager.execute(
14         manager.execute('DELETE FROM %s '
22 def delete_invalid_foriegn_keys(manager, pivot_table, foreign_key_field,  argument
24     manager.execute(
31     deleted_count = manager._database.rowcount
47 def create_unique_index(manager, pivot_table, first_field, second_field):  argument
49     manager.execute('CREATE UNIQUE INDEX %s ON %s (%s, %s)' %
55     execute_safely(manager, 'DROP INDEX %s ON %s' %
59 def drop_unique_index(manager, pivot_table, first_field):  argument
61     manager.execute('DROP INDEX %s ON %s' % (index_name, pivot_table))
64     manager.execute('CREATE INDEX %s ON %s (%s)' %
72 def create_foreign_key_constraint(manager, table, field, destination_table):  argument
74     manager.execute('ALTER TABLE %s ADD CONSTRAINT %s FOREIGN KEY (%s) '
79 def drop_foreign_key_constraint(manager, table, field):  argument
81     manager.execute('ALTER TABLE %s DROP FOREIGN KEY %s' % (table, key_name))
84 def cleanup_m2m_pivot(manager, pivot_table, first_field, first_table,  argument
86     delete_duplicates(manager, pivot_table, first_field, second_field)
87     delete_invalid_foriegn_keys(manager, pivot_table, first_field, first_table)
88     delete_invalid_foriegn_keys(manager, pivot_table, second_field,
94         create_unique_index(manager, pivot_table, second_field, first_field)
96     create_foreign_key_constraint(manager, pivot_table, first_field,
98     create_foreign_key_constraint(manager, pivot_table, second_field,
102 def reverse_cleanup_m2m_pivot(manager, pivot_table, first_field, second_field,  argument
104     drop_foreign_key_constraint(manager, pivot_table, second_field)
105     drop_foreign_key_constraint(manager, pivot_table, first_field)
107         drop_unique_index(manager, pivot_table, second_field)
124 def migrate_up(manager):  argument
127         cleanup_m2m_pivot(manager, table, first_field, first_table,
131 def migrate_down(manager):  argument
134         reverse_cleanup_m2m_pivot(manager, table, first_field, second_field,