Fix a bug for checking JSONAPI::Relationship::ToOne authorization

[clemoberti]

I had an error when I wanted to fetch a relationship and managed to fix it like this.
I'm not sure if that is the most correct way to do it but it worked for me.
Thanks for your efforts!

[valscion]

Hi! Thanks for your PR :)

I had an error

Could you clarify a bit? I'd need to know what the exact error was so I could figure out what this code is fixing. Ideally, I'd like to get a spec case to avoid a similar error from happening in the future, so knowing what error this fixes is crucial 😄

[clemoberti]

Yes sure!
So let's say we have two JSONAPI::Resources like this:

module Api::V1
  class UserResource < BaseResource
    has_one :profile
  end
end


module Api::V1
  class ProfileResource < BaseResource
    has_one :user
  end
end

If I try to call the following endpoint:
localhost:3000/api/v1/profiles/XXXXXXXXX/relationships/user
or this one
localhost:3000/api/v1/profiles/XXXXXXXXX/user

I get the following exception:

"exception": "undefined method `user' for #<Api::V1::ProfileResource:0x00000006265ec0>",
                "backtrace": [
                    "/home/clement/.rvm/gems/ruby-2.4.1/bundler/gems/jsonapi-authorization-24bfed7949a3/lib/jsonapi/authorization/authorizing_processor.rb:75:in `public_send'",

I hope my example makes sense? Do not hesitate if you need me to clarify

[valscion]

Hmm, can you tell me what version of jsonapi-resources you are using? And what version of jsonapi-authorization?

[clemoberti]

I'm on both master branches:

• jsonapi-resources master@19f4d7b
• jsonapi-authorization master@24bfed7

[valscion]

OK, that makes sense. We do not yet support the upcoming jsonapi-resources v0.10 (see #64), so could you try downgrading jsonapi-resources to 0.9.0 and see if your error goes away?

[clemoberti]

Damn, sorry about that... Yes the errors goes away in the previous version!

[valscion]

Yess, great to hear that! I'm gonna close this issue, and add a link to #64 to notice that there will be trouble heading down this road :)