Question

我的应用程序有一个服务器和域模块，以便服务器具有多个域和域belongs_to服务器。

我正在尝试在服务器控制器中呈现部分：

  def get_domain_checkboxes
      @domains = Domain.find_by(:server_id => params[:id])  
      render :partial => 'servers/domain_checkboxes', :layout => nil
  end

部分'_domain_checkboxes.html.erb'包含：

<% @domains.each do |domain| %>
    domain.url
<% end %>

但是当我转到'servers / 3 / get_domain_checkboxes'路线时出现错误，跟踪说：

Started GET "/servers/3/get_domain_checkboxes" for ::1 at 2015-12-18 05:03:08 +0200
Processing by ServersController#get_domain_checkboxes as HTML
  Parameters: {"server_id"=>"3"}
  Domain Load (0.3ms)  SELECT  "domains".* FROM "domains" WHERE "domains"."server_id" IS NULL LIMIT 1
  Rendered servers/_domain_checkboxes.html.erb (1.4ms)
Completed 500 Internal Server Error in 9ms (ActiveRecord: 0.4ms)

ActionView::Template::Error (undefined method `each' for nil:NilClass):
    1: <% @domains.each do |domain| %>
    2:     hello
    3: <% end %>
  app/views/servers/_domain_checkboxes.html.erb:1:in `_app_views_servers__domain_checkboxes_html_erb___2806237560631891313_70206341448100'
  app/controllers/servers_controller.rb:71:in `get_domain_checkboxes'

过去一小时都在尝试。我可能缺少一些简单的东西吗？

编辑：

尝试了@domains = Domain.find_by(:server_id => params[:server_id])，但仍然收到错误：

Started GET "/servers/3/get_domain_checkboxes" for ::1 at 2015-12-18 05:09:43 +0200
Processing by ServersController#get_domain_checkboxes as HTML
  Parameters: {"server_id"=>"3"}
  Domain Load (0.1ms)  SELECT  "domains".* FROM "domains" WHERE "domains"."server_id" = ? LIMIT 1  [["server_id", 3]]
  Rendered servers/_domain_checkboxes.html.erb (1.6ms)
Completed 500 Internal Server Error in 3ms (ActiveRecord: 0.1ms)

ActionView::Template::Error (undefined method `each' for #<Domain:0x007fb465810738>):
    1: <% @domains.each do |domain| %>
    2:     hello
    3: <% end %>
  app/views/servers/_domain_checkboxes.html.erb:1:in `_app_views_servers__domain_checkboxes_html_erb___2806237560631891313_70206341448100'
  app/controllers/servers_controller.rb:71:in `get_domain_checkboxes'

Answer 1

您需要更改：

@domains = Domain.find_by(:server_id => params[:id])

到

@domains = Domain.where(:server_id => params[:server_id])

rails partial不接收变量

1 个答案: