How to deserialize parameters with relationships using ActiveModelSerializers? - ruby-on-rails

Question

I used to code below to deserialize the JSON API data send from client,
def action_record_params
ActiveModelSerializers::Deserialization.jsonapi_parse!(params)
end
When I pass the following data from the client, the deserializer cannot see relationships attributes.
Client send parameter
params = {"data": {"type": "action_record", "attributes": {"value": ""}}, "relationships": {"card": {"data": {"type": "card", "id": "#{card.id}"}}}}
Server deserialized data
{:value=>""}
How to deserialize parameters with relationships using ActiveModelSerializers?

Answer 1

Base on AMS documentation Deserialization section, which can be found below
https://github.com/rails-api/active_model_serializers/blob/master/docs/general/deserialization.md
The relationships can be extracted by via the option only: [:relatedModelName]. only is act as a whitelist in this case.
Sample Data
document = {
'data' => {
'id' => 1,
'type' => 'post',
'attributes' => {
'title' => 'Title 1',
'date' => '2015-12-20'
},
'relationships' => {
'author' => {
'data' => {
'type' => 'user',
'id' => '2'
}
},
'second_author' => {
'data' => nil
},
'comments' => {
'data' => [{
'type' => 'comment',
'id' => '3'
},{
'type' => 'comment',
'id' => '4'
}]
}
}
}
}
AMS deserialization with options
ActiveModelSerializers::Deserialization
.jsonapi_parse(document, only: [:title, :date, :author],
keys: { date: :published_at },
polymorphic: [:author])
Output hash
# {
# title: 'Title 1',
# published_at: '2015-12-20',
# author_id: '2',
# author_type: 'user'
# }