如何使用连接 table 制作多模型 tag_cloud?

How to make a multi model tag_cloud with a join table?

我有一个加入table

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

其目的是使一个 tag_cloud 适用于多个模型。我把这个放在 application_controller

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

型号

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

如果您需要进一步解释或code请告诉我,以帮助您帮助我:)

在我看来,您可以使用 polimorphing。请参阅 Active Record Associations

在您的情况下,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

在此之后您可以:

@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