Rails嵌套表单在数据库中插入空属性

问题描述：

我搜索了很多，这个问题的常见原因是attr_ascessible：model_attributes没有被声明，但我似乎无法得到它的工作。Rails嵌套表单在数据库中插入空属性

查看下面的日志：裁判和：ticket_order值在params散列中，但随后在表中插入为null。 user_id和event_id的外键保存在新记录中，没有任何错误。关于大规模分配的警告让我接触到attr_ascessible声明，尝试了它的不同变化，但没有运气。我正在使用设计。

开发日志

Started POST "/events/1" for 127.0.0.1 at 2011-07-14 17:38:16 +0100 
    Processing by EventsController#update as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"ddddddjTdnaLKQgZncSDGYt63JA=", "event"=>{"relationship"=>{"event_id"=>"1", "referee"=>"9", "ticket_order"=>"1"}}, "commit"=>"Confirm Purchase", "id"=>"1"} 
    User Load (20.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = 8 LIMIT 1 
    Event Load (13.1ms) SELECT "events".* FROM "events" WHERE "events"."id" = 1 LIMIT 1 
    AREL (18.7ms) INSERT INTO "relationships" ("user_id", "event_id", "created_at", "updated_at", "referee", "ticket_order") VALUES (8, 1, '2011-07-14 16:38:16.963351', '2011-07-14 16:38:16.963351', NULL, NULL) 
WARNING: Can't mass-assign protected attributes: relationship 
[paperclip] Saving attachments. 
Redirected to http://localhost:3000/events/1 
Completed 302 Found in 588ms

活动

class Event < ActiveRecord::Base 
    attr_accessible :artist, :venue, :show_info, :date, :doors, :ticket_issue, :ticket_price, 
    :travel_cost, :accomodation_cost, :hire_cost, :image, :avatar_url, :relationships_attributes, :referee, :ticket_order 
    has_many :relationships 
    has_many :users, :through => :relationships 
    accepts_nested_attributes_for :relationships

活动控制器

def new 
    @event = Event.new 
    @users = Relationships.find(:all) 
    relationship = @event.relationships.build() 
    end 

    def create 
    @event = Event.new(params[:event]) 
    current_user.attend!(@event) 
    if @event.save 
     redirect_to @event, :notice => "Successfully created event." 
    else 
     render :action => 'new' 
    end 
    end

User.rb

def attending?(event) 
    relationships.find_by_event_id(event) 
end

Relationship.rb

class Relationship < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :event 
attr_accessible :event_id

表单视图

<%= semantic_form_for @event do |form| %>  
        <%= form.semantic_fields_for :relationship do |builder| %> 
         <%= builder.hidden_field :event_id, :value => @event.id %> 
         <%= builder.inputs do %> 
         <%= builder.input :referee, :as => :select, :collection => @event.users.all %> 
         <%= builder.input :ticket_order, :as => :number %> 
         <% end %> 
        <% end %>

也许这里以复数的关系：'形式.semantic_fields_for：relationship' – apneadiving

这是一个问题，不一定是答案：在参数中，“关系”应该是复数？它将映射成看起来像多对多的关联，并且这些关联被复数化并期望列表，不是？ – jaydel

@Seho Cahill：请不要忘记接受有效答案：这是过程的一部分 – apneadiving

答

是的，它必须是这个，替换：

form.semantic_fields_for :relationship

有：

form.semantic_fields_for :relationships

谢谢。似乎表单行为并不完全符合我的期望，但我会自己去解决这个问题。 –

...那太恼人了。我实际上有一个以字母s结尾的模型（即设置），并且我有fields_for：settings ...我最终不得不将其更改为fields_for：setting（这没有任何意义，因为没有Setting模型。） – you786

@ you786是的...应该遵循Rails约定来避免这种边缘情况 – apneadiving

Rails嵌套表单在数据库中插入空属性

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