Hario

Hario provides ActiveRecord filtering for Rails APIs.

Installation

Add this line to your application's Gemfile:

gem 'hario'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hario

Usage

Setup

Add include Hario::Filterable to your AR model to add the search method, for instance (we'll use these classes as examples throughout):

def Brand < ActiveRecord::Base
  extend Hario::Filterable

  has_many :products
end

def Product < ActiveRecord::Base
  belongs_to :brand
  belongs_to :category, class_name: "ProductCategory"
end

def ProductCategory < ActiveRecord::Base
  has_many :products
end

Then in your BrandsController you can use the search method in your index action:

class BrandsController < ApplicationController
  respond_to :json

  def index
    @brands = Brand.search(params[:filters])

    respond_with(@brands)
  end
end

Filters

The format of params[:filters]'s keys is a dot-seperated chain of association(s) -> attribute -> operator, for instance if you wanted to return brands that have products of type "Shoe" you could add the filter:

{ 'products.category.name.equals' => 'Shoe' }

Which would result in the SQL query something like:

SELECT "brands".* FROM "brands"
INNER JOIN "products" ON "products"."brand_id" = "brands"."id"
INNER JOIN "product_categories" ON "product_categories"."id" = "products"."category_id"
WHERE "product_categories"."name" = 'Shoe'

The available operators are:

  • lt (less than)
  • gt (greater than)
  • lte (less than or equal)
  • gte (greater than or equal)
  • like (sql like)
  • equals

Todo

  • Migrate our application-specific tests across to the gem

Tests

To run tests:

rake test

Contributing

  1. Fork it ( https://github.com/meritec/hario/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request