diff options
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb index c179be828e..468f8d75d7 100644 --- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb @@ -796,8 +796,21 @@ module ActiveRecord # Returns just a table's primary key def primary_key(table) - pk_and_sequence = pk_and_sequence_for(table) - pk_and_sequence && pk_and_sequence.first + row = exec_query(<<-end_sql, 'SCHEMA', [[nil, table]]).rows.first + SELECT DISTINCT(attr.attname) + FROM pg_attribute attr, + pg_depend dep, + pg_namespace name, + pg_constraint cons + WHERE attr.attrelid = dep.refobjid + AND attr.attnum = dep.refobjsubid + AND attr.attrelid = cons.conrelid + AND attr.attnum = cons.conkey[1] + AND cons.contype = 'p' + AND dep.refobjid = $1::regclass + end_sql + + row && row.first end # Renames a table. |