ruby-on-rails - Rails select_tag 不会访问 belongs_to 关系

Question

我正在尝试做一个

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

但是 entity.name 不会工作抛出一个未定义的方法“entity.name”。 “实体”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

您可以向您的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")