Project

itemable

0.0
No commit activity in last 3 years
No release in over 3 years
itemablexiaohui-zhangxh/itemableHomepageDocumentationSource CodeBug TrackerWiki
Make your ActiveRecord model to be an item, has polymorphic children and parents.
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
 Popularity
Downloads
2,762
Stars
3
Forks
0
Watchers
1
 Releases
Current version
0.1.1
Total releases
1
First release
2017-04-07
Latest release
2017-04-07
 Development
Primary Language
Ruby
Licenses
MIT
Average date of last 50 commits
2017-04-07
Reverse Dependencies
0

 Dependencies

Development

sqlite3
>= 0

Runtime

rails
>= 4.2
 Project Readme

Itemable Build Status Gem Version

Make your ActiveRecord model as a item, it can be child or parent of self-modle or other-model

When will you need this gem?

Think about you are using PostgreSQL database, you just want to simplely store some unusually-query data into one table, put various files into one jsonb filed, record many have some child records, or parent records, such as a Car has many accessories: 4 Wheels, 3 Chairs, and a Wheel has one Tyre, 5 Screws. I don't care how to store them, just care about their relations, so now let's make this with Itemable:

  1. Setup Itemable
  2. Create Models Car, Wheel, Chair, Tyre, Screw
  3. Create relations to each model

Installation

Add this line to your application's Gemfile:

gem 'itemable'

And then execute below to create tables itemable_items and itemable_item_relations:

$ rails g itemable:migration
$ rake db:migrate

Usage

Create Car modle

$ rails g model car name

Update app/models/car.rb:

class Car < ActiveRecord::Base
    acts_as_itemable
    has_many_items :wheels, dependent: :destroy
    has_many_items :chairs, dependent: :destroy
end
  • acts_as_itemable makes Car has all feature of Itemable
  • has_many_items :wheels declares a car has many wheels
  • has_many_items :chairs declares a car has many chairs

Create Wheel model without db migration:

Add app/models/wheel.rb

class Wheel < ActiveRecord::Base
    acts_as_itemable sti: true
    belongs_to_item :car
    has_many_items :screws, dependent: :destroy
    has_one_item: :tyre, dependent: :destroy
end
  • acts_as_itemable sti: true, sti = true means Wheel is a single table inherited Model, will get records from table itemable_items
  • belongs_to_item :car declares wheel belongs to car
  • has_one_item: :tyre declares wheel has only one tyre

Add app/models/chair.rb

class Chair < ActiveRecord::Base
    acts_as_itemable sti: true
    belongs_to_item :car
end

Add app/models/tyre.rb

class Tyre < ActiveRecord::Base
    acts_as_itemable sti: true
    belongs_to_item :wheel
end

Add app/models/screw.rb

class Screw < ActiveRecord::Base
    acts_as_itemable sti: true
    belongs_to_item :wheel
end

Now everything is ready, let store/query data

car = Car.create
4.times do
    car.wheels << Wheel.create
end
3.times do
    car.chairs << Chair.create
end
wheel = Wheel.first
wheel.tyre = Tyre.create
5.times do
    wheel.screws << Screw.create
end

car.reload
car.item_children.count => 7
car.item_children.map(&:child)
=> [#<Wheel:0x007f86ba65f930 id: 16, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Wheel:0x007f86ba677fa8 id: 17, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Wheel:0x007f86ba685568 id: 18, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Wheel:0x007f86ba69c038 id: 19, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Chair:0x007f86ba6cd0e8 id: 20, type: "Chair", created_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00>,
 #<Chair:0x007f86ba6e4e28 id: 21, type: "Chair", created_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00>,
 #<Chair:0x007f86ba706c58 id: 22, type: "Chair", created_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00>]
car.wheels.count => 4
=> [#<Wheel:0x007f86c018b8e0 id: 16, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Wheel:0x007f86c018b750 id: 17, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Wheel:0x007f86c018b5c0 id: 18, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>,
 #<Wheel:0x007f86c018b430 id: 19, type: "Wheel", created_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:18 UTC +00:00>]
car.chairs.count => 3
=> [#<Chair:0x007f86be2baab0 id: 20, type: "Chair", created_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00>,
 #<Chair:0x007f86be2ba830 id: 21, type: "Chair", created_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00>,
 #<Chair:0x007f86be2ba538 id: 22, type: "Chair", created_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:22 UTC +00:00>]
wheels = car.wheels
wheels[0].item_children.count => 6
wheels[0].item_children.map(&:child)
=> [#<Tyre:0x007f86be44f290 id: 23, type: "Tyre", created_at: Fri, 07 Apr 2017 04:53:33 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:33 UTC +00:00>,
 #<Screw:0x007f86be46e0f0 id: 24, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86be47cf60 id: 25, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86be497d38 id: 26, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86be4a6ba8 id: 27, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86be4b59f0 id: 28, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>]
wheels[0].tyre
=> #<Tyre:0x007f86b8fb04c8 id: 23, type: "Tyre", created_at: Fri, 07 Apr 2017 04:53:33 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:33 UTC +00:00>
wheels[0].screws.count => 5
=> [#<Screw:0x007f86b833c750 id: 24, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86b833c570 id: 25, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86b833c3e0 id: 26, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86b833c250 id: 27, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>,
 #<Screw:0x007f86b833c0c0 id: 28, type: "Screw", created_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:53:49 UTC +00:00>]
wheels[1].tyre => nil
wheels[1].tyre = Tyre.create
=> #<Tyre:0x007f86bbb8e450 id: 29, type: "Tyre", created_at: Fri, 07 Apr 2017 04:58:05 UTC +00:00, updated_at: Fri, 07 Apr 2017 04:58:05 UTC +00:00>
wheels[1].item_children.count => 1

See, it's so easy to build model relations

Advanced Usage

acts_as_itemable has following options:

  • sti: true or false
  • children: true or false
    • true generates association item_children, then support has_many_items
    • false does nothing
  • child: true or false
    • true generates association item_child, then support has_one_item
    • false does nothing
  • parents: true or false
    • true generates association item_parents, then support belongs_to_items
    • false does nothing
  • parent: true or false
    • true generates association item_parents, then support belongs_to_item
    • false does nothing

options of has_many_items, has_one_item, belongs_to_items, belongs_to_item are the same to has_many or belongs_to

Test

rake

Contributing

Contribution directions go here.

License

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