A module to enrich JSON:API Serializers with configurable formats.

Add this line to your Gemfile:

gem 'jsonapi-serializer-formats'

Execute:

$ bundle install

After the module is included in your existing serializer, the format keyword is now available for you to use

class MovieSerializer
  include JSONAPI::Serializer
  include JSONAPI::Formats

  attributes :name

  format :detailed do
    attribute   :year
    attribute   :rating

    has_many :actors
  end
end

When no filter is specified, only the attributes declared at the root will be rendered.

hash = MovieSerializer.new(movie).serializable_hash

Output

{
  "data": {
    "id": "3",
    "type": "movie",
    "attributes": {
      "name": "pulp fiction"
    }
  }
}

When a format is specified during render, the attributes defined under that format will be included

hash = MovieSerializer.new(movie, { params: { format: :detailed }}).serializable_hash

Output

{
  "data": {
    "id": "3",
    "type": "movie",
    "attributes": {
      "name": "pulp fiction",
      "year": "1994",
      "rating": 5
    },
    "relationships": {
      "actors": {
        "data": [...]
      }
    }
  }
}

You can nest formats one into another. A nested format will only render if all of its parent formats have been enabled during rendering

class MovieSerializer
  include JSONAPI::Serializer
  include JSONAPI::Formats

  attributes :name

  format :detailed do
    attribute   :year

    format :admin do
      attribute :view_count
    end
  end
end

hash = MovieSerializer.new(movie, { params: { format: [:detailed, :admin] } }).serializable_hash

Renders

{
  "data": {
    "id": "3",
    "type": "movie",
    "attributes": {
      "name": "pulp fiction",
      "year": "1994",
      "view_count": 98776
    }
  }
}

MIT License

Copyright (c) 2021 Patrick R

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.