如何使用连接表制作多模型tag_cloud？

Question

我有一个联接表

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tag_cloud适用于多个模型.我把它放在application_controller中

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

我的tag_cloud看起来像这样:

<% 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 %>

我在所有模型的_form中都有这一行:<%= f.text_field :tag_list %>

combine_tags_helper

module CombineTagsHelper
  include ActsAsTaggableOn::TagsHelper
end

楷模

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

如果您需要进一步的解释或代码来帮助我,请告诉我:)

• @ github上的act-as-taggable-on

Answer 1

在我看来，你可以使用多态性。请参阅活动记录关联

在你的情况下，模型可能是下一个：

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
....

在迁移中：

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

之后您可以：

@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