Ruby on Rails关联导致错误

Question

关联结果时出现问题。让我带你走过:

我有两张表。仪表板、图表。

图表表有一个dashboard_id字段，因为仪表板有许多图表。

我想在仪表板控制器中获取仪表板和所有相关的图表。以下是目前为止的内容:

class Dashboards < ActiveRecord::Base
     has_many :charts
     ....
end
class Charts < ActiveRecord::Base
     has_one :dashboard
     ....
end

控制器

class DashboardsController < ApplicationController
     def show 
         #an ID is passed but for testing...
         @dashboard = Dashboards.includes(:charts)
     end
end

<<p> 视图/strong>

/仪表板/show.html.erb

<%=@dashboard.inspect%>

结果

uninitialized constant Dashboards::Chart

谁能告诉我我做错了什么?它看起来很干净，我花了几个小时研究这个。我是不是忽略了什么?

Answer 1

首先，模型类名称应该使用单数(例如Dashboard, Chart等)。同时将Chart仪表板关联更改为:

class Chart < ActiveRecord::Base
  belongs_to :dashboard
  ....
end

现在在控制器中(通常使用复数形式)，这应该可以工作:

class DashboardsController < ApplicationController
  def show 
    #an ID is passed but for testing...
    @dashboard = Dashboard.includes(:charts)
  end
end