diff options
Diffstat (limited to 'alembic')
| -rw-r--r-- | alembic/ddl/mysql.py | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/alembic/ddl/mysql.py b/alembic/ddl/mysql.py index 8be4543..7956185 100644 --- a/alembic/ddl/mysql.py +++ b/alembic/ddl/mysql.py @@ -9,6 +9,7 @@ from .base import ColumnNullable, ColumnName, ColumnDefault, \ ColumnType, AlterColumn, format_column_name, \ format_server_default from .base import alter_table +from ..autogenerate import compare class MySQLImpl(DefaultImpl): @@ -123,6 +124,39 @@ class MySQLImpl(DefaultImpl): if idx.name in removed: metadata_indexes.remove(idx) + # then dedupe unique indexes vs. constraints, since MySQL + # doesn't really have unique constraints as a separate construct. + # but look in the metadata and try to maintain constructs + # that already seem to be defined one way or the other + # on that side. See #276 + metadata_uq_names = set([ + cons.name for cons in metadata_unique_constraints + if cons.name is not None]) + + unnamed_metadata_uqs = set([ + compare._uq_constraint_sig(cons).sig + for cons in metadata_unique_constraints + if cons.name is None + ]) + + metadata_ix_names = set([ + cons.name for cons in metadata_indexes if cons.unique]) + conn_uq_names = dict( + (cons.name, cons) for cons in conn_unique_constraints + ) + conn_ix_names = dict( + (cons.name, cons) for cons in conn_indexes if cons.unique + ) + + for overlap in set(conn_uq_names).intersection(conn_ix_names): + if overlap not in metadata_uq_names: + if compare._uq_constraint_sig(conn_uq_names[overlap]).sig \ + not in unnamed_metadata_uqs: + + conn_unique_constraints.discard(conn_uq_names[overlap]) + elif overlap not in metadata_ix_names: + conn_indexes.discard(conn_ix_names[overlap]) + class MySQLAlterDefault(AlterColumn): |