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item_id
2006 Apr 10
4
Many To Many''s Join table attributes + migrations
...the above problem.
Say I have the following conceptual relationships:
ITEMS <<--->> CARTS
i.e., each item can belong to one or more categories. So really we have
ITEMS <<--> ITEMS_CARTS <-->> CARTS
where the join table, items_carts, has the dual primary keys
{items_id, carts_id}.
However, in reality people can and will buy more than one of each
item and so items_carts needs an additional attribute: quantity.
My question is how might the above be defined as a migration? In
WebObjects when modelling the above entities (akin to migrations) you
simply set th...