action-store: A Ruby repository from debbbbie

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]

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
@user1.create_action(:follow, target: @user2)
@user1.reload.following_count => 1
@user2.reload.followers_count_ => 1
@user1.follow_user?(@user2) => true
# @user2 -> follow @user1
@user2.create_action(:follow, target: @user1)
@user2.follow_user?(@user1) => true
# @user1 -> follow @user3
@user1.create_action(:follow, target: @user3)
# @user1 -> unfollow @user3
 @user1.destroy_action(:follow, target: @user3)

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

debbbbie/action-store