Question

我收到此错误：

ActiveRecord :: AssociationTypeMismatch（设计（＃2199041060）预期，得到字符串（＃2151988680））

我正在尝试创建一个事件，用户可以为事件输入一些信息，同时选择一个设计。每次我单击“创建”按钮时都会发生错误。

以下是我的模特：

class Design < ActiveRecord::Base  
  belongs_to  :event        # User creates an Event and selects only one Design
  belongs_to  :user         # User could also create a Design 
end

class Event < ActiveRecord::Base
  belongs_to  :user     # A user can create as many events
  has_one     :design   # User can only select one design for this event
end

这是我的事件控制器

def create
  @event = Event.new(params[:event])
  @user = current_user
  @designs = Design.all

  if @event.save
    flash[:success] = "Event created"
    @user.events << @event 
    redirect_to events_path
  end
end

这是我的活动视图：

<%= form_for @event, :url => {:action => 'create', :id => @event.id } do |e| %>
<p>Enter a title for this event: <%= e.text_field :title %> </p>

<p>Select a design:</p> 
 <ul class = "list">
    <% @designs.each do |design| %>
        <li><%= e.radio_button :design, design.id %> <%= design.name %></li>
    <% end %>
 </ul>
    <%= e.submit "Create" %>
<% end %>

Answer 1

在您的视图中，将：design更改为：design_id。

Answer 2

<%= e.radio_button :design, design.id %>

你实际上并没有将整个设计对象传递给你的事件模型 - 只是id，所以这实际上应该反过来使用：

<%= e.radio_button :design_id, design.id %>

编辑：并添加到您的活动模型：

def design_id=(the_id)
  return unless the_id
  the_design = Design.find_by_id(the_id)
  self.design = the_design if the_design
end

关联类型不匹配

2 个答案: