ruby-on-rails – 嵌套模型表单中的Collection_select

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 => 'Select Athlete' } ) %>
  <% end %>

<%= f.submit 'Create' %>

<% end %>

是否可以使用如上所示的collection_select填充Run的：athlete_id字段,在Timesheet的嵌套表单中,或者我错过了什么？

解决方法

看起来你没有在表单构建器上创建集合选择,尝试这样的事情：

<% f.fields_for :runs do |r| %>
  <%= r.collection_select(:athlete_id,{ :prompt => 'Select Athlete' } ) %>
<% end %>