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
rails g lite:query:install
will generate the following file:
../app/queries/application_query.rb
class ApplicationQuery < Lite::Query::Base
end
Use rails g query NAME
will generate the following file: ../app/queries/[name]_query.rb
You will then need to fill this class with the required execute
method as shown below:
class AgeQuery < ApplicationQuery
# NOTE: this method is required
def execute
return relation unless args[:age]
relation.where('age > ?', args[:age])
end
private
def default_relation
User.all
end
end
Usage
There are multiple ways to access the query call:
relation = User.limit(1)
query = AgeQuery.new(relation)
query.call
# - or -
query = AgeQuery.new(age: 10)
query.exectue
# - or -
AgeQuery.call(relation, age: 20)
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/[USERNAME]/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.