Question

我正在尝试

select_tag "employee_compensation_benefits_selection", options_from_collection_for_select(@employees, "id", "entity.name", "1")

但是entity.name不会工作会抛出一个未定义的方法`entity.name'。 “entity”属于另一个模型。通过entity_id

class Employee < ActiveRecord::Base

  include UUIDHelper

  belongs_to :entity
  has_one :status
  has_many :restdays
  has_one :regular_work_period

  validates_presence_of :entity

end

require 'file_size_validator'
class Entity < ActiveRecord::Base

  include UUIDHelper

  has_one :access, autosave: true
  has_one :employee, autosave: true
  has_many :contact_detail, autosave: true
  has_many :file_set
  has_many :link_set

  mount_uploader :logo, AvatarUploader
  validates_presence_of :name
  validates :name, uniqueness: true
  validates_length_of :description, maximum: 256

  validates :logo,
        :file_size => {
            :maximum => 25.megabytes.to_i
        }
end

Answer 1

您可以向员工添加一个可以调用的方法，例如：

class Employee < ActiveRecord::Base
  ...

  def entity_name
    self.entity.name
  end
end

然后：

select_tag "employee_compensation_benefits_selection", options_from_collection_for_select(@employees, "id", "entity_name", "1")

或者您可以使用lambda而不是添加方法：

select_tag "employee_compensation_benefits_selection", options_from_collection_for_select(@employees, "id", lambda { |employee| employee.entity.name }, "1")

Answer 2

您可以将其添加到您的员工模型中：

def entity_name
  self.entity.name
end

或者您可以将这样的委托添加到您的Employee模型中：

delegate :name, :to => :entity, :prefix => true

然后你可以这样做：

select_tag "employee_compensation_benefits_selection", options_from_collection_for_select(@employees, "id", "entity_name", "1")

Answer 3

＆＃39;实体＆＃39; model是指一个表名＆＃39; entity＆＃39;在数据库上（除非你覆盖了表名的默认值）。使用＆＃34; entities.name＆＃34;代替。如果您加入结果@employees = Employer.joins（：entity），这将有效。

Rails select_tag将无法访问belongs_to relation

3 个答案: