Error in form for a model which belongs_to another

Hi everyone, be forewarned that I’m new to ruby and rails.

I’ve got two models Course and Lesson. Course has_many :lessons and Lesson belongs_to :course. Currently the models themselves just have attr_accessible with the :name and :description fields.

When I try to load the form to create a new lesson (url is localhost:3000/courses/(course_id)/lessons/new), I get an error which says: undefined method `lessons_path’ and it points to line 1 of the form partial for making new lessons. I’ve tried searching on the net for a couple days now and have tried several different things, but I can’t figure it out.

Here’s the code:

lessons_controller.rb (relevant methods only)

  • def new
    @course = Course.find(params[:course_id])
    @lesson = @course.lessons.new
    end
    def create
    @course = Course.find(params[:course_id])
    @lesson = @course.lessons.create(params[:lesson])
    if @lesson.save
    redirect_to course_path(@course), :notice => “Successfully created lesson.”
    else
    render :action => ‘new’, :error => “Something went wrong.”
    end
    end*

_form.html.erb

  • <%= form_for(@lesson) do |f| %>
    <%= f.error_messages %>

<%= f.label :name %>
<%= f.text_field :name %>

<%= f.label :description %>
<%= f.text_area :description %>
<%= f.submit "Submit" %>
<% end %>*

routes.rb

  • resources :courses do
    member do
    get ‘detail’
    end
    resources :lessons
    end*