如何在rails中定义has_and_belongs_to关联

Question

我正在观看这个视频http://railscasts.com/episodes/258-token-fields-revised，我也成功地实现了这一点。但现在我使用命名空间。我有lends_controller在文件夹员工在资产文件夹。这是我的贷款控制器模型

class Employee::Asset::Lend
  include Mongoid::Document
  include Mongoid::Timestamps
  field :name, type: String
  field :text, type: String
  field :date
  field :asset_tokens
  field :user_id, type: String
  has_and_belongs_to_many :assets
  belongs_to :tags
def asset_tokens=(tokens)
 self.asset_ids = Asset.ids_from_tokens(tokens)
 end
end

现在我有另一个模型资产。这里我必须定义有和属于这个借出模型我还做了这个

class Asset
  include Mongoid::Document
  field :name, type: String
  field :description, type: String
  field :serial_number, type: String
  field :status, type: Integer
  field :tag_tokens
  field :quantity, type: Integer
  validates_presence_of :name 
  validates :serial_number,:uniqueness => true
  has_and_belongs_to_many :employee_asset_lends
  has_and_belongs_to_many :tags
  def self.tokens(query)
   assets = where(name: /#{Regexp.escape(query)}/i)

  end

借阅控制器的形式是

<%= f.label :asset_tokens, "Assets" %>
  <%= f.text_field :asset_tokens, data: {load: @employee_asset_lend.assets}%><br>
  <%= f.input :date,:input_html => { :class => "dp1"},:label=> "Lend Date"%>

inside coffescript file for lend.js.coffee

jQuery ->
  $('#employee_asset_lend_asset_tokens').tokenInput '/assets.json'
    theme: 'facebook'
    prePopulate: $('#employee_asset_lend_asset_tokens').data('load')

但它给出了错误uninitialized constant EmployeeAssetLend from asset views.从借出视图，它给出错误像undefined method all_of' for Employee::Asset:Module '

Answer 1

请查看创建HABTM-has_and_belongs_to_many关联的正确方法获取更多详细信息