rails部分未收到變量

我的應用程序有一個服務器和域模塊，例如服務器has_many域和域belongs_to服務器。rails部分未收到變量

我試圖渲染服務器控制器部分：

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

局部「_domain_checkboxes.html.erb」載：

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

但是要當我得到一個錯誤'servers/3/get_domain_checkboxes'路線和跟蹤說：

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'

嘗試過去一小時。可能是我錯過的簡單東西？

編輯：

嘗試@domains = Domain.find_by(:server_id => params[:server_id])代替，但仍得到一個錯誤：

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'

來源

2015-12-18 Tom

你需要改變：

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

到

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

來源

2015-12-18 03:07:52 BroiSatse

仍然出現錯誤，雖然有點不同。查看編輯問題 – Tom

@Tom - 更新了答案。 – BroiSatse

工作！那爲什麼呢？ – Tom

rails部分未收到變量

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