Simple_form错误 - ActiveRecord :: Relation：Class未定义的方法`model_name'

问题描述

每当我使用除.find之外的任何其他内容（params [：] id]，错误未定义的方法`model_name'为ActiveRecord :: Relation：Class

我的代码在

Controller：

  def edit 
 @office = Office.where（id =？AND company_id =？， params [：id]，@ company.id）
 end 
  

查看：

 <％= simple_form_for @office，：url => settings_office_path，：html => {：class =>office_form } do | f |％> 
< h1>编辑<％= @ office.office_name％>详情< / h1> 
<％= render：partial =>'form' ：locals => {：f => f}％> 
<％end％> 
  

我输出了@office的类，它是ActiveRecord :: Relation。如果我只是使用

  @ office = Office.find（params [：id]）
  

输出是Office。

我认为这是问题，但不知道如何解决它。任何想法？

解决方案

表单期望一个记录位于 @office 实例变量，其中 - 方法不会返回单个记录，而是返回一个关系，一次查询就可以是多个记录。

正确的方法是：

  @office = Office.where（：company_id => @或者更好，如果你有更好的选择，或者更好，如果你有更好的选择，定义关系：
 
 
  @office = @ company.offices.find（params [：id]）
 
 code> 
 
I am trying to add some more conditional logic to my edit action by passing params into a where.
Whenever I use anything other than .find(params[:id], the error undefined method `model_name' for ActiveRecord::Relation:Class
My code is below
Controller:
def edit
   @office = Office.where("id = ? AND company_id = ?", params[:id], @company.id )
end
View:
<%= simple_form_for @office, :url => settings_office_path, :html => { :class => "office_form" } do |f| %>
  <h1>Edit <%= @office.office_name %> Details</h1>
  <%= render :partial => 'form', :locals => { :f => f } %>
<% end %>
I outputted the class for @office which is ActiveRecord::Relation.  If I just use 
@office = Office.find(params[:id])
the output is Office.
I think this is the problem but don't know how to fix it. Any ideas?
 解决方案 
The form expects a single record to be in the @office instance variable, the where-method doesn't return a single record but a relation, which can be multiple records, once queried.
The correct way is:
@office = Office.where(:company_id => @company.id).find(params[:id])
Or even better, if you've defined the relation:
@office = @company.offices.find(params[:id])
                        
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