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    copied!<p>I see that your new action does have the <code>business_area_id: '2'</code> parameter but, in your controller's new action you aren't instantiating the business_area. It should look like this:</p> <pre><code>class BusinessFlowsController &lt; ApplicationController def new @business_area = BusinessArea.find params[:business_area_id] @business_flow = BusinessFlow.new # not needed here since this isn't being created yet # @business_flow.business_area_id = params[:business_area_id] end ... rest of code ... end </code></pre> <p>Now that you instantiated the <code>business_area</code>, the <code>form_for</code> should be able to correctly build the nested path which should include the <code>business_area_id</code>. Now your business_flows controller's create action should look like this:</p> <pre><code>def create @business_area = BusinessArea.find params[:business_area_id] @business_flow = @business_area.business_flows.build(business_flow_params) # assigning the parent id happens automatically in the build method # @business_flow.business_area_id = params[:business_area_id] @business_flow.updated_by = current_user.login @business_flow.created_by = current_user.login @business_flow.playground_id = current_user.current_playground_id @business_flow.owner_id = current_user.id ... rest of code ... end </code></pre> <p>To make sure the form's action includes the <code>business_area_id</code> check the rendered html. The form's attributes should look like:</p> <p><code>action="/business_areas/&lt;:business_area_id&gt;/business_flows" method="post"</code> </p> <p>where <code>&lt;:business_area_id&gt;</code> is the integer id of the parent, in your case <code>2</code>.</p>
 

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