在过去的几周里,我遇到了一个找不到答案的问题。我觉得这可能很简单,但它让我发疯了,所以我希望能得到一点指导。。。
我正在将1个表单中的数据插入到2个模型中。一种模型称为场馆,另一种模型则称为活动。这是一个一对多的协会,多个活动属于场馆,场馆有多个活动。
型号:
class Venue < ActiveRecord::Base
has_many :events
accepts_nested_attributes_for :events
end
class Event < ActiveRecord::Base
belongs_to :venue
scope :upcoming, where('date >= ?', Date.today)
end
控制器:
class EventsController < ApplicationController
def new
@venue = Venue.new
end
def create
@venue = Venue.new(params[:venue])
if @venue.save
render :inline => "Success"
else
render('new')
end
end
end
形式:
<%= form_for(@venue, :url =>{:action => 'create'}) do |f| %>
Artist ID<br />
<%= fields_for :event do |event_fields| %>
<%= event_fields.text_field :artist_id %><br/><br />
<% end %>
Venue City<br />
<%= f.text_field(:city) %> <br /><br />
Venue Name<br />
<%= f.text_field(:name) %><br/><br/>
<div class="actions">
<%= submit_tag "Save", :class => "btn primary" %>
</div>
<% end %>
日志输出:
Started POST "/events" for 127.0.0.1 at 2012-02-17 19:57:24 -0500
Processing by EventsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"p3llx5KsYn6gyjP9g2qwzXr+0rjh3h/o34h/iqvqjRo=", "event"=>{"artist_id"=>"124"}, "venue"=>{"city"=>" Boston", "name"=>"Bostons Fa'v"}, "commit"=>"Save"}
(0.2ms) BEGIN
SQL (0.8ms) INSERT INTO "venues" ("address_1", "address_2", "capacity", "city", "country", "created_at", "created_by", "name", "state", "updated_at", "url", "zip") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) RETURNING "id" [["address_1", nil], ["address_2", nil], ["capacity", nil], ["city", " Boston"], ["country", nil], ["created_at", Sat, 18 Feb 2012 00:57:24 UTC +00:00], ["created_by", nil], ["name", "Bostons Fa'v"], ["state", nil], ["updated_at", Sat, 18 Feb 2012 00:57:24 UTC +00:00], ["url", nil], ["zip", nil]]
(0.4ms) COMMIT
Rendered inline template (0.2ms)
Completed 200 OK in 5ms (Views: 0.6ms | ActiveRecord: 1.4ms)
正如你所看到的,它没有失败,但它只是向1模型提交。我的理解是,通过添加"accepts_nested_attributes_for:events",Venue模型知道然后转到我的events表,用我提供的事件数据创建一个新事件(在本例中仅为artist_id),然后自动将我的场所表中的id字段插入Venue_id。
我在这里想得越多,就越觉得我可能会错过一步。。。。如果有人有时间的话,我会很高兴听到你对此的思考过程。
感谢
我认为表单中有语法错误。fields_for是f的一个方法,它需要一个复数符号。将块的迭代器设为单数也是一种很好的做法,当您的方法只需要一个参数时,不要使用括号:
<%= form_for(@venue, :url =>{:action => 'create'}) do |f| %>
Artist ID<br />
<%= f.fields_for :events do |event_field| %>
<%= event_field.text_field :artist_id %><br/><br />
<% end %>
Venue City<br />
<%= f.text_field :city %> <br /><br />
Venue Name<br />
<%= f.text_field :name %><br/><br/>
<div class="actions">
<%= submit_tag "Save", :class => "btn primary" %>
</div>
<% end %>
参见Ryan Bate的Railscasts:中的嵌套表单示例
<%= form_for @survey do |f| %>
<%= f.error_messages %>
<p>
<%= f.label :name %><br />
<%= f.text_field :name %>
</p>
<% f.fields_for :questions do |builder| %>
<p>
<%= builder.label :content, "Question" %><br />
<%= builder.text_area :content, :rows => 3 %>
</p>
<% end %>
<p><%= f.submit "Submit" %></p>
<% end %>
Venue
模型需要指定哪些属性是可批量分配的,包括Event
属性。
attr_accessible :event_attributes, :address_1, :address_2, :capacity # ...