[patch] PostgreSQL index introspection fails on tables that have dropped columns
|Reported by:||Chris Chamberlin <dja@…>||Owned by:||adrian|
|Component:||Database layer (models, ORM)||Version:||master|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
When building models from an existing PostgreSQL database, python manage.py inspectdb fails if the table being inspected has had columns that were created and then dropped before inspection.
Traceback (most recent call last): File "manage.py", line 11, in ? execute_manager(settings) File "/usr/lib/python2.3/site-packages/django/core/management.py", line 1250 , in execute_manager execute_from_command_line(action_mapping) File "/usr/lib/python2.3/site-packages/django/core/management.py", line 1179 , in execute_from_command_line for line in action_mapping[action](): File "/usr/lib/python2.3/site-packages/django/core/management.py", line 716, in inspectdb indexes = introspection_module.get_indexes(cursor, table_name) File "/usr/lib/python2.3/site-packages/django/db/backends/postgresql/introsp ection.py", line 67, in get_indexes col_name = desc[int(row)-1] IndexError: tuple index out of range
The problem is that when a column is dropped, PostgreSQL doesn't actually remove it from the pg_catalog.pg_attribute table, which the pg_catalog.pg_index.indkey column references; instead, it just renames them to something like "...pg.dropped.4...". The pgsql driver then leaves that column out of its column list, but this means you can't index into an array of columns using the indkey field.
I'll attach a patch that fixes get_indexes() by joining in the indexed column names in the main query. This is tested with PostgreSQL 7.4.8; I don't have access to 8.x. Also, I assume django/db/backends/postgresql_psycopg2/introspection.py should get the same patch.
Change History (3)
Changed 10 years ago by Chris Chamberlin <dja@…>
comment:1 Changed 10 years ago by anonymous
- Summary changed from PostgreSQL index introspection fails on tables that have dropped columns to [patch] PostgreSQL index introspection fails on tables that have dropped columns