Pacecar adds scope methods and other common functionality to ActiveRecord classes via database column introspection.
Pacecar automatically includes the Pacecar::Helpers module into all ActiveRecord::Base classes.
To get all Pacecar functionality, you need to "include Pacecar" in your class.
class User < ActiveRecord::Base include Pacecar end
To get some subset (for example, only the state functionality), you can do something like "include Pacecar::State" to get only the module(s) you want.
class Post < ActiveRecord::Base include Pacecar::State end
Pacecar supports mysql, postgres and sqlite database drivers, and is compatible with Rails 4.x versions.
Just include in your Gemfile:
Assuming a database schema:
class CreateSchema < ActiveRecord::Migration def self.up create_table :users, force: true do |t| t.boolean :admin, default: false, null: false t.datetime :approved_at t.datetime :rejected_at t.string :first_name t.string :last_name t.text :description t.timestamps end create_table :posts, force: true do |t| t.string :owner_type t.integer :owner_id t.string :publication_state t.string :post_type t.timestamps end create_table :comments, force: true do |t| t.integer :user_id t.text :description t.integer :rating t.timestamps end end end
And some basic model declarations:
class User < ActiveRecord::Base include Pacecar has_many :posts, as: :owner has_many :comments has_many :articles end class Post < ActiveRecord::Base include Pacecar PUBLICATION_STATES = %w(Draft Submitted Rejected Accepted) TYPES = %w(Free Open Private Anonymous PostModern) belongs_to :owner, polymorphic: true has_state :publication_state has_state :post_type, with: TYPES has_polymorph :owner end class Comment < ActiveRecord::Base include Pacecar belongs_to :user end class Article < ActiveRecord::Base belongs_to :user end
Records where approved_at is not null, or where it is null:
Records where first_name is not null, or where it is null:
Records ordered by first_name (default to 'asc', can specify to override):
User.by_first_name User.by_first_name(:asc) User.by_first_name(:desc)
Records where an attribute matches exactly a term:
Records that are all admins or non-admins:
Records which have an owner_type of User:
Records which are in a particular state, or not in a state:
Query methods on instances to check state:
First x records:
Because these are all scope, you can combine them.
To get all users that have a first_name set, who are admins:
Pacecar is maintained and funded by thoughtbot, inc
Thank you to all the contributors!
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Pacecar is Copyright © 2008-2013 thoughtbot. It is free software, and may be redistributed under the terms specified in the MIT-LICENSE file.