Litetags

Fast & simple Rails ActiveRecord model tagging using native SQLite functionality. This is a port of @hopsoft's tag_columns gem, which is uses native PostgreSQL functionality.

This gem makes it easy to:

• Assign categories to your database records.
• Assign multiple groups to user records
• Assign categories to blog posts et al.
• etc...

Install the gem and add to the application's Gemfile by executing:

$ bundle add litetags

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install litetags

# db/migrate/TIMESTAMP_add_groups_to_user.rb
class AddGroupsToUser < ActiveRecord::Migration[5.0]
  def change
    add_column :users, :groups, :json, null: false, default: []
    add_check_constraint :users, "JSON_TYPE(groups) = 'array'", name: 'user_groups_is_array'
  end
end

# app/models/user.rb
class User < ApplicationRecord
  include Litetags
  tag_columns :groups
end

user = User.find(1)

# assigning tags
user.groups << :reader
user.groups << :writer
user.save

# checking tags
is_writer            = user.has_group?(:writer)
is_reader_or_writer  = user.has_any_groups?(:reader, :writer)
is_reader_and_writer = user.has_all_groups?(:reader, :writer)

# finding tagged records
assigned                = User.with_groups
unassigned              = User.without_groups
writers                 = User.with_any_groups(:writer)
non_writers             = User.without_any_groups(:writer)
readers_or_writers      = User.with_any_groups(:reader, :writer)
readers_and_writers     = User.with_all_groups(:reader, :writer)
non_readers_and_writers = User.without_all_groups(:reader, :writer)

# find unique tags across all users
User.unique_groups

# find unique tags for users with the last name 'Smith'
User.unique_groups(last_name: "Smith")

After checking out the repo, run bin/setup to install dependencies. Then, run rake test 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 the created tag, and push the .gem file to rubygems.org.

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

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

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