Question

When I click the ‘New Schedule Status’ button on the ‘Project’ show page, but the route that the error shows me is plural, when it should be singular. Here’s my code:

# project.rb
class Project < ActiveRecord::Base
  has_one :schedule_status
end

# schedule_status.rb
class ScheduleStatus < ActiveRecord::Base
  belongs_to :project
end

# schedule_statuses_controller.rb
def new
  @project = Project.find(params[:project_id])
  @schedule_status = @project.build_schedule_status
end

# routes.rb
resources :projects do
  resource :schedule_status
end

# _form.html.erb
<%= form_for [@project, @schedule_status] do |f| %>
  ...

The error informs me that my form_for line is incorrect. It seems like my instance variables are setup correctly, but the error is:

undefined method `project_schedule_statuses_path` for ...

Any idea why the route it’s attempting to access is plural?

Answer 1

This is a bug. form_for looks for the plural version of the object. However since you’ve declared a singular resource :schedule_status, the path helper method is never created.

To get around this you should use :url parameter for form_for.

Look at this question/answer for more clarity.