Filter for rails controller based on JsonAPI spec: /books?filter[library_id]=1,2&filter[author_id][eq]=12&filter[created_at][gt]=2021-02-02

Add this line to your application's Gemfile:

gem 'json_api_filter'

And then execute:

$ bundle

Or install it yourself as:

$ gem install json_api_filter

To filter this request /books?filter[library_id]=1,2&filter[author_id]=12&search=Lord of the ring&include=users,users.posts

class Book < ApplicationController

  include JsonApiFilter
  permitted_filters  %i[library_id author_id]
  permitted_searches :user_search
  permitted_inclusions %i[users users.posts]

  def index
    @books = json_api_filter(Book, params)
    inclusions = json_api_inclusions(params) # returns [:users, :'users.posts']

    # then use `inclusions` in the serialiser
    BookSerializer.new(@books, include: inclusions).serializable_hash.to_json
  end
end

• permitted_filters let you define allowed attributes to filter on (mandatory)
• permitted_searches let you define the allowed search method defined in you model what will be called if you pass search params in your request (can be a pg_search scope)
• permitted_inclusions let you define the allowed inclusions
• json_api_filter(scope, params) return an active record relation (Book:: in this example)

If an endpoint does not support the include parameter, it MUST respond with 400 Bad Request to any requests that include it.

class Book < ApplicationController

  include JsonApiFilter
  permitted_filters  %i[library_id author_id]
  permitted_searches :user_search
  
  rescue_from JsonApiFilter::MissingPermittedInclusionError, with: :render_400

  def index
    @books = json_api_filter(Book, params)
    inclusions = json_api_inclusions(params) # raises JsonApiFilter::MissingPermittedInclusionError
  end
  
  private
  
  def render_400(exception)
    render json: exception, status: 400
  end
end

If a server is unable to identify a relationship path or does not support inclusion of resources from a path, it MUST respond with 400 Bad Request. This request should return a 400 status:

/books?filter[library_id]=1,2&filter[author_id]=12&search=Lord of the ring&include=users,users.posts, users.addresses

class Book < ApplicationController

  include JsonApiFilter
  permitted_filters  %i[library_id author_id]
  permitted_searches :user_search
  permitted_inclusions %i[users users.posts]

  rescue_from JsonApiFilter::UnknownInclusionsError, with: :render_400

  def index
    @books = json_api_filter(Book, params)
    inclusions = json_api_inclusions(params) # raises JsonApiFilter::UnknownInclusionsError
  end

  private

  def render_400(exception)
    render json: exception, status: 400
  end
end

0.2.x version is not compatible with 0.1 In your controller, you will have to replace all occurrences of attr_filter as bellow :

def index 
  @books = Book.all.where(attr_filter(params))
end

def index
  @books = json_api_filter(Book, params)
end

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/Blaked84/json_api_filter. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the JsonApiFilter project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.