Rails - 有很多：通过，多个模型混乱

Question

我正在处理 4 个模型。我有一个帐户、位置、标签和标签模型。我已将其设置如下

class Tag < ActiveRecord::Base

  # belongs_to :shelter
  has_many :taggings, :dependent => :destroy
  has_many :locations, :through => :taggings
  has_many :accounts, :through => :taggings

end

class Tagging < ActiveRecord::Base

  belongs_to :location
  belongs_to :tag
  belongs_to :shelter

end

class Account < ActiveRecord::Base
  has_many :taggings, :dependent => :destroy
  has_many :tags, :through => :taggings, :dependent => :destroy
end

class Location < ActiveRecord::Base
  has_many :taggings, :dependent => :destroy
  has_many :tags, :through => :taggings, :dependent => :destroy
end

create_table :taggings, :force => true do |t|
  t.references :account
  t.references :location
  t.references :tag
  t.timestamps
end

我遇到的问题是当我创建位置页面上的表单时。我希望能够标记一个位置，但将其与帐户关联，并且正在努力解决如何正确执行表单和控制器逻辑的逻辑

在我的表单 /location/1/tags 嵌套表单中。但在控制器中我似乎无法弄清楚如何正确添加标签。这是我的 TagsController

def create
    @tag = Tag.find_or_create_by_name(params[:tag][:name])
    @location = @current_account.locations.find(params[:location_id])
    @location.tags << @tag
end

它正在工作，但创建了多行。我希望能够创建标签，然后将位置、帐户、标签分配给标签。

Answer 1

怎么样

@tag = Tag.find_or_create_by_name(params[:tag][:name])
@location = @current_account.locations.find(params[:location_id])
@tagging = Tagging.create(:tag => @tag, :location => @location, :shelter => @current_account)