Question

Having a problem associating my results. Let me walk you though it:

I have 2 tables. dashboards, charts.

The charts table has a dashboard_id field as a dashboard has many charts.

So what I want in the dashboard controller is to grab the dashboard and all associated charts. Here is what I have so far:

Models

class Dashboards < ActiveRecord::Base
     has_many :charts
     ....
end

class Charts < ActiveRecord::Base
     has_one :dashboard
     ....
end

Contoller

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

View

/dashboards/show.html.erb

<%=@dashboard.inspect%>

Result

uninitialized constant Dashboards::Chart

Can someone tell me what I’m doing wrong? It looks pretty clean to me and I have spent a few hours researching this. Am I overlooking something?

Answer 1

Firstly, model class names should use the singular (e.g. Dashboard, Chart, etc). Also change the Chart dashboard association to:

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

Now in your controller (which generally uses the plural as you have it), this should work:

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