Support relation by foreign id

[xslim]

Currently relations are supported by searching relationName in representation

This hack allows building relations by using relationName_id or relationName_ids, as many Ruby on Rails engines return.

[mattt]

Thanks for your pull request, @xslim. There's a lot in here other than the foreign ID stuff, so it's going to take some time for me to determine what I should take from this. Bear with me for a moment.

[xslim]

Sorry for a lot of commits, I'm trying to use the library in current app development, and I stuccoed with the problem of entities are not saved in DB. So some of the commits are fixing this issue.

[xslim]

Also I've made implementation for sending If-Modified-Since and working with 304 Not Modified… but this work is currently in my gist https://gist.github.com/3855430

If you have any comments how to improve the code for pull request - please tell me I'll do that.

[mattt]

No worries at all—thanks for your contributions.

As it were, I just added Last-Modified support myself, with 40bee2d. It takes a different approach from yours by managing Last-Modified in the same way as resource identifiers. Interested to hear any thoughts you have.

[xslim]

You developed Last-Modified for "per-resource request"

What I did in my gist, is developed Last-modified when requesting "array" of items.

The example implementation on rails side is

#AreasController
  def index
    @areas = parent.areas
    if stale?(last_modified: @areas.max(:updated_at))
      respond_with @areas
    end
  end

So I get the last modified area in database, and send this info to server. Server checks it against his DB and returns just :304 if nothing changed, or :200 with the list of areas if there were changes. This saves bandwidth.

[xslim]

https://github.com/xslim/AFIncrementalStore/commit/06041256e5c76190fba714f4b6d8a4c2aff8c180 prevents crashing when server sends 304 Not-Modified and empty data in success.

To make 304 a success response I also added this code in APIClient subclass

// 304 Not-Modified
[AFJSONRequestOperation addAcceptableStatusCodes:[NSIndexSet indexSetWithIndex:304]];

[xslim]

Should I change my pull request to reflect your latest commits?

[mattt]

As of e8c6472, AFIncrementalStore is no longer being actively maintained. Thank you for your contributions; my sincere apologies for any inconvenience this may have caused.