ActionStore

Store different kinds of actions (Like, Follow, Star, Block, etc.) in a single table via ActiveRecord Polymorphic Associations.

• Like Posts/Comment/Reply ...
• Watch/Subscribe to Posts
• Follow Users
• Favorite Posts
• Read Notifications/Messages

And more and more.

中文介绍和使用说明

Basic table struct

Column	Description
action_type	The type of action [like, watch, follow, star, favorite]
action_option	Secondary option for storing your custom status, or null if unneeded.
target_type, target_id	Polymorphic Association for different Target models [User, Post, Comment]

Uniqueness

version: ">= 0.4.0"

The have database unique index on fields: [action_type, target_type, target_id, user_type, user_id] for keep uniqueness for same action from user to target.

Usage

gem 'action-store'

and run bundle install

Generate Migrations:

$ rails g action_store:install
create  config/initializers/action_store.rb
migration 20170208024704_create_actions.rb from action_store

and run rails db:migrate.

Define Actions

Use action_store to define actions:

app/models/user.rb

class User < ActiveRecord::Base
  action_store <action_type>, <target>, opts
end

Convention Over Configuration:

action, target	Target Model	Target counter_cache_field	User counter_cache_field	Target has_many	User has_many
action_store :like, :post	Post			has_many :like_by_user_actions, has_many :like_by_users	has_many :like_post_actions, has_many :like_posts
action_store :like, :post, counter_cache: true	Post	likes_count		has_many :like_by_user_actions, has_many :like_by_users	has_many :like_post_actions, has_many :like_posts
action_store :star, :project, class_name: 'Repository'	Repository	stars_count	star_projects_count	has_many :star_by_user_actions, has_many :star_by_users
action_store :follow, :user	User	follows_count	follow_users_count	has_many :follow_by_user_actions, has_many :follow_by_users	has_many :follow_user_actions, has_many :follow_users
action_store :follow, :user, counter_cache: 'followers_count', user_counter_cache: 'following_count'	User	followers_count	following_count	has_many :follow_by_user_actions, has_many :follow_by_users	has_many :follow_user_actions, has_many :follow_users

for example:

# app/models/action.rb
class User < ActiveRecord::Base
  action_store :like, :post, counter_cache: true
  action_store :star, :post, counter_cache: true, user_counter_cache: true
  action_store :follow, :post
  action_store :like, :comment, counter_cache: true
  action_store :follow, :user, counter_cache: 'followers_count', user_counter_cache: 'following_count'
end

Counter Cache

Add counter_cache field to target and user tables.

add_column :users, :star_posts_count, :integer, default: 0
add_column :users, :followers_count, :integer, default: 0
add_column :users, :following_count, :integer, default: 0

add_column :posts, :likes_count, :integer, default: 0
add_column :posts, :stars_count, :integer, default: 0

add_column :comments, :likes_count, :integer, default: 0

Example usage:

@user likes @post

irb> User.create_action(:like, target: @post, user: @user)
true
irb> @user.create_action(:like, target: @post)
true
irb> @post.reload.likes_count
1

@user1 unlikes @user2

irb> User.destroy_action(:follow, target: @post, user: @user)
true
irb> @user.destroy_action(:like, target: @post)
true
irb> @post.reload.likes_count
0

Check if @user1 likes @post

irb> action = User.find_action(:follow, target: @post, user: @user)
irb> action = @user.find_action(:like, target: @post)
irb> action.present?
true

Other following use cases:

# @user1 -> follow @user2
irb> @user1.create_action(:follow, target: @user2)
irb> @user1.reload.following_count
=> 1
irb> @user2.reload.followers_count_
=> 1
irb> @user1.follow_user?(@user2)
=> true

# @user2 -> follow @user1
irb> @user2.create_action(:follow, target: @user1)
irb> @user2.follow_user?(@user1)
=> true

# @user1 -> follow @user3
irb> @user1.create_action(:follow, target: @user3)

# @user1 -> unfollow @user3
irb> @user1.destroy_action(:follow, target: @user3)

Subscribe cases:

Sometimes, you may need use action_option option.

For example, user to subscribe a issue (like GitHub Issue) on issue create, and they wants keep in subscribe list on unsubscribe for makesure next comment will not subscribe this issue again.

So, in this case, we should not use @user.unsubscribe_issue method to destroy action record, we need set a value on action_option to mark this subscribe is ignore.

irb> User.create_action(:subscribe, target: @issue, user: @user)
irb> @user.subscribe_issue?(@issue)
=> true

irb> User.create_action(:subscribe, target: @issue, user: @user, action_option: "ignore")
irb> @user.subscribe_issue?(@issue)
=> true

irb> action = User.find_action(:subscribe, target: @issue, user: @user)
irb> action.action_option
=> "ignore"

irb> @issue.subscribe_by_user_actions.count
=> 1
irb> @issue.subscribe_by_user_actions.where(action_option: nil).count
=> 0

Built-in relations and methods

When you call action_store, ActionStore will define many-to-many relations for User and Target models.

For example:

class User < ActiveRecord::Base
  action_store :like, :post
  action_store :block, :user
end

Defines many-to-many relations:

• For User model: <action>_<target>s (like_posts)
• For Target model: <action>_by_users (like_by_users)

# for User model
has_many :like_post_actions
has_many :like_posts, through: :like_post_actions
## as user
has_many :block_user_actions
has_many :block_users, through: :block_user_actions
## as target
has_many :block_by_user_actions
has_many :block_by_users, through: :block_by_user_actions

# for Target model
has_many :like_by_user_actions
has_many :like_by_users, through: :like_user_actions

And User model will now have methods:

• @user.create_action(:like, target: @post)
• @user.destroy_action(:like, target: @post)
• @user.find_action(:like, target: @post)
• @user.like_post(@post)
• @user.like_post?(@post)
• @user.unlike_post(@post)
• @user.block_user(@user1)
• @user.unblock_user(@user1)
• @user.like_post_ids
• @user.block_user_ids
• @user.block_by_user_ids