Renaming replace_table to replace_table_hack and documenting why it's a hack

We'd still prefer people use other solutions when possible!

This commit sponsored by Michał Masłowski.  Thank you!

mediagoblin/db/migration_tools.py

@@ -288,8 +288,9 @@ def inspect_table(metadata, table_name):
     return Table(table_name, metadata, autoload=True,
                  autoload_with=metadata.bind)
 
-def replace_table(db, old_table,replacement_table):
-    """A function to fully replace a current table with a new one for migrati-
+def replace_table_hack(db, old_table, replacement_table):
+    """
+    A function to fully replace a current table with a new one for migrati-
     -ons. This is necessary because some changes are made tricky in some situa-
     -tion, for example, dropping a boolean column in sqlite is impossible w/o
     this method
@@ -298,7 +299,12 @@ def replace_table(db, old_table,replacement_table):
                                     inspect_table
 
         :param replacement_table    A ref to the new table, gotten through
-                                    inspect_table"""
+                                    inspect_table
+
+    Users are encouraged to sqlalchemy-migrate replace table solutions, unless
+    that is not possible... in which case, this solution works,
+    at least for sqlite.
+    """
     surviving_columns = replacement_table.columns.keys()
     old_table_name = old_table.name
     for row in db.execute(select(

mediagoblin/db/migrations.py

@@ -27,8 +27,8 @@ from migrate.changeset.constraint import UniqueConstraint
 
 
 from mediagoblin.db.extratypes import JSONEncoded, MutationDict
-from mediagoblin.db.migration_tools import (RegisterMigration, inspect_table,
-        replace_table)
+from mediagoblin.db.migration_tools import (
+    RegisterMigration, inspect_table, replace_table_hack)
 from mediagoblin.db.models import (MediaEntry, Collection, MediaComment, User, 
         Privilege)
 
@@ -695,7 +695,7 @@ def create_moderation_tables(db):
         User_vR1.__table__.create(db.bind)
         db.commit()
         new_user_table = inspect_table(metadata, 'rename__users')
-        replace_table(db,user_table, new_user_table)
+        replace_table_hack(db, user_table, new_user_table)
     else:
         # If the db is not run using SQLite, this process is much simpler ~~~~~