Lite::Query

Lite::Query is a library for using the query pattern to separate complex query logic from classes such as controllers and models.

Installation

Add this line to your application’s Gemfile:

gem 'lite-query'

And then execute:

$ bundle

Or install it yourself as:

$ gem install lite-query

Table of Contents

• Setup
• Usage

Setup

Generators

rails g query NAME will generate the following file in your application root:

app/queries/[NAME]_query.rb

If a ApplicationQuery file in the app/queries directory is available, the generator will create file that inherit from ApplicationQuery if not it will fallback to Lite::Query::Base.

Query

You will need to fill this class with the required call method as shown below:

class AgeQuery < Lite::Query::Base

  def call
    return relation unless args[:age]

    relation.where('age > ?', args[:age])
  end

end

Usage

There are multiple ways to access the query call:

Instance

relation = User.limit(1)
query = AgeQuery.new(relation, age: 10)
query.call #=> SELECT * FROM users WHERE age = 10 LIMIT 1

Class

AgeQuery.call(User, age: 20) #=> SELECT * FROM users WHERE age = 10

Scope

class User < ApplicationRecord

  scope :min_age, ->(age) { MinAgeQuery.new(self, age: age) }

end

Development

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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/drexed/lite-query. 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.

License

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

Code of Conduct

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