小编jkt*_*ess的帖子

我有时间表模型,运行模型和运动员模型.

class Timesheet < ActiveRecord::Base
  has_many :runs, :dependent => :destroy
  accepts_nested_attributes_for :runs
end


class Run < ActiveRecord::Base
  belongs_to :timesheet
  belongs_to :athlete
end

class Athlete < ActiveRecord::Base
  has_many :runs
end

运行嵌套在Timesheets下,我想在创建Timesheet的同一表单上创建一些运行,如此railscast中所示

class TimesheetsController < ApplicationController
  def new
    @timesheet = Timesheet.new
    3.times { @timesheet.runs.build }
  end

在我的时间表表单上,我遇到了我的collection_select问题(运动员名称的下拉列表填充了运行表中的:athlete_id字段).

<% form_for(@timesheet) do |f| %>
  <%= f.error_messages %>
  <%= f.label "Date" %>
  <%= f.text_field :date %>

  <% f.fields_for :runs do |builder| %>
    <%= collection_select(:run, :athlete_id, Athlete.all(:order => 'name'), :id, :name, { :prompt => …