Support array data for updating to-many relationships

[nikajukic]

I've noticed that array data in a request body isn't supported and it's actually a part of the JSON:API specification.

https://jsonapi.org/format/#crud-updating-to-many-relationships

Example body:

PATCH /articles/1/relationships/tags HTTP/1.1
Content-Type: application/vnd.api+json
Accept: application/vnd.api+json

{
  "data": [
    { "type": "tags", "id": "2" },
    { "type": "tags", "id": "3" }
  ]
}

params

:data=>[{:id=>"2", :type=>"tags"}, {:id=>"3", :type=>"tags"}]

It currently breaks with when I call params.from_jsonapi with

TypeError: no implicit conversion of Symbol into Integer
...lib/jsonapi_parameters/translator.rb:37:in `dig`

I would expect it to be parsed to:

tag_ids: [2, 3]

Thank you for this gem! 👍

[choosen]

Thank you very much for contribution.
We review your previous PR, which is nicely described.

We can take care of that as it's important feature and are adding it to backlog,
but you are also welcome to post your solution to it 😄

[nikajukic]

Thanks! 😄

I'm not promising anything, but I'll try to propose a solution soon 😄