如何使用連接表創建多模型tag_cloud？

Question

我有一個連接表

create_table "combine_tags", force: true do |t| 
    t.integer "user_id" 
    t.integer "habit_id" 
    t.integer "valuation_id" 
    t.integer "goal_id" 
    t.integer "quantified_id" 
end 

，其目的是使多個車型tag_cloud工作。我把這個在application_controller

def tag_cloud 
    @tags = CombineTag.tag_counts_on(:tags) 
end 

我tag_cloud看起來是這樣的：

<% tag_cloud(@tags, %w(css1 css2 css3 css4)) do |tag, css_class| %> 
    <%= link_to tag.name, tag_path(tag), :class => css_class %> 
<% end %> 

# or this depending on which works: 

<% tag_cloud CombineTag.tag_counts, %w[s m l] do |tag, css_class| %> 
    <%= link_to tag.name, tag_path(tag.name), class: css_class %> 
<% end %> 

我在_form所有型號的這一行：<%= f.text_field :tag_list %>

combine_tags_helper

種

module CombineTagsHelper 
    include ActsAsTaggableOn::TagsHelper 
end 

模式

class CombineTag < ActiveRecord::Base 
    belongs_to :habit 
    belongs_to :goal 
    belongs_to :quantified 
    belongs_to :valuation 
    belongs_to :user 
    acts_as_taggable 
end 

class Habit < ActiveRecord::Base # Same goes for other models 
    has_many :combine_tags 
    acts_as_taggable 
end 

請讓我知道如果你需要進一步的解釋或code幫你幫我:)

• acts-as-taggable-on @ github

Answer 1

在我看來，你可以使用polimorphing。請參閱Active Record Associations

在你的情況，型號可能是下一個：

class Tag < ActiveRecord::Base 
    belongs_to :taggable, polymorphic: true 
.... 

class Habit < ActiveRecord::Base 
    has_many :tags, as: :taggable 
.... 

class Goal < ActiveRecord::Base 
    has_many :tags, as: :taggable 
.... 

而且在遷移：

create_table :tags , force: true do |t| 
    t.references :taggable, polymorphic: true, index: true 
    t.timestamps null: false  
end 

這之後您可以：

@tags = Tag.include(:taggable) 
@tags.each do |tag| 
    type = tag.taggable_type # string, some of 'habit', 'goal' etc 
    id = tag.taggable_id # id of 'habit', 'goal' etc 
end