我的嵌套属性有什么问题?

时间:2016-12-15 06:16:41

标签: ruby-on-rails ruby nested-attributes

我尝试在周计划中添加许多小时,所以我编码:     #应用程序/模型/ week_plan.rb     类WeekPlan< ApplicationRecord       has_many:小时       accepts_nested_attributes_for:小时     端

# app/model/hour.rb
class Hour < ApplicationRecord
  belongs_to :weekplan
end

# app/controllres/weekplan_controller.rb
class WeekplansController < ApplicationController

  def new
    @weekplan = WeekPlan.new
    7.times { @weekplan.hours.build }
  end

  private
    def set_weekplan
      @weekplan = WeekPlan.find(params[:id])
    end

    def weekplan_params
      params.require(:weekplan).permit(hours_attributes: [ :date_start ])
    end
end

最终, app / views / weekplans / new.html.rb

<h1>New Plan</h1>

<%= form_for @weekplan do |f| %>
  <%= f.fields_for :hours do |hour| %>
    <p>
        <%= f.label :user_id %><br>
        <%= f.select :user_id, User.all.collect { |p| [ p.name, p.id ] }, include_blank: true %>
    </p>

    <p>
        <%= f.label :date %><br>
        <%= f.datetime_field :date %>
    </p>

    <p>
        <%= f.label :date_start %><br>
        <%= f.datetime_field :date_start %>
    </p>

    <p>
        <%= f.label :date_end %><br>
        <%= f.datetime_field :date_end %>
    </p>
  <% end %>
  <%= f.submit %>
<% end %>

但是,当我运行我的应用程序时,我收到错误:

(undefined method `user_id' for #<WeekPlan id: nil, created_at: nil, updated_at: nil>):

我无法理解,一个bug隐藏在哪里?

1 个答案:

答案 0 :(得分:4)

您应该在hour.label

中使用hour.selectfields_for :hours
f.fields_for :hours do |hour| %>       # <======= hour was not used, use it
    <p>
        <%= hour.label :user_id %><br> # <======= hour, not `f`
        <%= hour.select :user_id, User.all.collect { |p| [ p.name, p.id ] }, include_blank: true %>
        # same with all other nested object's fields

P.S。 Ruby数据的Ruby处理很糟糕:

User.all.collect { |p| [ p.name, p.id ]

使用db:

User.pluck(:name, :id)