Use with PostgreSQL throws Integrity Error

[ChrisFreeman]

When I tried migrating a working setup from sqlite3 to PostgreSQL, I hit the following error:

IntegrityError at /cart/ insert or update on table "shop_simplevariations_cartitemoption" violates foreign key constraint "cartitem_id_refs_id_16df55fa"
DETAIL:  Key (cartitem_id)=(60) is not present in table "shop_cartitem".

Exception Value:    

insert or update on table "shop_simplevariations_cartitemoption" violates foreign key constraint "cartitem_id_refs_id_16df55fa"
DETAIL:  Key (cartitem_id)=(60) is not present in table "shop_cartitem".

It is though it trying to modify the cart item before the item becomes a CartItem.

Removing the OptionGroup from the shop product allowed adding the item successfully to the cart. Unfortunately, With only one price option.