I was writing a custom ‘find_or_create’ method on a model today, that I was planning to use from an association collection. I wanted it to pick up the association’s scope (the foreign key value). It turns out, it happens automatically.
Here’s an example:
What I really want, is for my member find-or-create to be scoped to the room
it’s on when I do
I figured it was possible, so I set a debugger breakpoint in
and checked out the available information. What I found is that the static method
is called inside of a
with_scope block, so
Member.scoped_methods has some
useful information. In this case, it’s an array with one element, the scoped
association relation (i.e. the thing returned by
room.members). It’s possible for
the array to contain hashes, too, and several elements, if there are several
nested scopes. So, any find-like or create-like calls that you make inside the
class method will automatically get the right scope.