diff options
Diffstat (limited to 'lib/sqlalchemy/orm/mapper.py')
| -rw-r--r-- | lib/sqlalchemy/orm/mapper.py | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py index 011e7d2ef..7d1fc7643 100644 --- a/lib/sqlalchemy/orm/mapper.py +++ b/lib/sqlalchemy/orm/mapper.py @@ -1368,17 +1368,17 @@ class Mapper( # that of the inheriting (unless concrete or explicit) self.primary_key = self.inherits.primary_key else: - # determine primary key from argument or persist_selectable pks - - # reduce to the minimal set of columns + # determine primary key from argument or persist_selectable pks if self._primary_key_argument: - primary_key = sql_util.reduce_columns( - [ - self.persist_selectable.corresponding_column(c) - for c in self._primary_key_argument - ], - ignore_nonexistent_tables=True, - ) + primary_key = [ + self.persist_selectable.corresponding_column(c) + for c in self._primary_key_argument + ] else: + # if heuristically determined PKs, reduce to the minimal set + # of columns by eliminating FK->PK pairs for a multi-table + # expression. May over-reduce for some kinds of UNIONs + # / CTEs; use explicit PK argument for these special cases primary_key = sql_util.reduce_columns( self._pks_by_table[self.persist_selectable], ignore_nonexistent_tables=True, |