hi there ! i am trying to adapt the endpoints example to work with something similar to Books having many Tags but Tags not being unique to a specific book (because there might also be Magazines and other Books that share the Tag). would this always require joining with a through table? what if I also want to have Magazines associated with the same Tags collection -- would that require a second table to join?

https://gist.github.com/ononotofu/cb268fd3c5d8b37da376 has some related implementation. is a polymorphic association appropriate without a "Books_Tags" table -- and i'd prefer to not have many similarly named joining tables created to create the relationship. it seems like there is probably a best practice for something that comes up this often, but i can't find the same relationship mocked up in an example in either bookshelf or endpoints. appreciate any help!