Filtering

Gem for comfort filtering of ActiveRecord queries.

Installation

Add this line to your application's Gemfile:

gem 'filtering'

And then execute:

$ bundle

Or install it yourself as:

$ gem install filtering

Usage

All you need to do is inherit custom filter service from Filtering::Base and define params for filtering.

Example filter service

class Filters::UsersFilter < Filtering::Base
  def initialize(params, args)
    super(params, args)
  end

  private

  # Required methods

  def relation
    User.all
  end

  def plain_acessible_params
    %i[city age]
  end

  def complex_acessible_params
    %i[name]
  end

  # Complex filters

  def filter_by_name(name)
    results.where('name ILIKE ? or name_auto ILIKE ?', "%#{name}%", "%#{name}%")
  end
end

There are private methods:

relation is an ActiveRecord initial relation which must be filtered

plain_acessible_params array of params for an auto-filtering by where, so if you have %i[city age] will be called User.where(city: city).where(age: age)

complex_acessible_params array of params for filters with custom logic. If you have some params in that method you have to create methods for those custom filters with format: filter_by_{param}

Calling

Controller usage example:

def index
  render json: Filters::UsersFilter.new(params, page: params[:page], order: :asc).call
end

If you don't use Kaminari just delete page from initializer

License

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

Code of Conduct

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