Filterable attributes

[ehannes]

From #113

Ok, now I know how this works.

First of all, Fortnox expects the request to look something like this:

https://api.fortnox.se/3/articles?articlenumber=1
Now to the gem. The find method calls find_all_by when you send it a hash.

def find_all_by( hash )
response_hash = get( "#{ self.class::URI }?#{ to_query( hash ) }" )
instantiate_collection_response( response_hash )
end

There are no use of any mappers or anything here (to_query simply turns articlenumber: 1 to &articlenumber=1). Since find_all_by simply turns whatever you give it to query parameters, it not only supports attributes, but filters, sorting, searching, limits & offsets as well as pagination. That is why we need to pass articlenumber and not article_number to the find-method. Whether we should change that or not is open for discussion :)

[d-Pixie]

We should change it :)

The correct implementation is that the to_query method actually uses the mapper and that we also drop any attributes sent in that are not tagged as "filterable" in the options (see the #121 PR).