- refactor the FK merge a bit

- getting at attributes of FKs varies a bit on SQLA versions,
so implement an _fk_spec() called for all FK inspection
- to enable include_object() filters and allow the FK constraint
code to flow like that of indexes/uniques, change the approach
so that we deal with an _fk_constraint_sig() object again which
contains the real ForeignKeyConstraint() within; we need this
anyway for include_object, but also allows us to use the standard
"drop_constraint" call for rendering.
- enhance tests in test_autogen_fks to support real FK databases like
Postgresql, MySQL, add in InnoDB flags and ensure that FKs refer
to real primary key constraints for PG support
- implement and test include_object() support for FKs
- inspectors all have get_foreign_keys(), no need to check
- repair the drop_constraint call to quote the "type" and table
name correctly, run all constraint drops through drop_constraint()
for rendering
- fix up schema identifiers for foreign key autogens

1 files changed, 0 insertions, 1 deletions

diff --git a/alembic/ddl/mysql.py b/alembic/ddl/mysql.py
index aac8184..b93d29f 100644
--- a/alembic/ddl/mysql.py
+++ b/alembic/ddl/mysql.py
@@ -95,7 +95,6 @@ class MySQLImpl(DefaultImpl):
 
         # TODO: if SQLA 1.0, make use of "duplicates_index"
         # metadata
-
         removed = set()
         for idx in list(conn_indexes):
             # MySQL puts implicit indexes on FK columns, even if