Nested form sends :id instead of friendly_id in POST request

Question

routes.rb:

resources :courses, path: '' do
  resources :students do
    resources :awards
  end
end

students/show.html.erb

<%= form_for [@course, @student, @award] do |f| %>

  <div class="field">
    <%= f.label :ticket %><br>
    <%= f.text_field :ticket %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>

<% end %>

models/student.rb

belongs_to :course
has_many :awards, dependent: :destroy

extend FriendlyId
friendly_id :uuid, use: [ :slugged, :finders ]

controllers/students_controller.rb

before_action :set_course

def show
  @student = @course.students.find_by_uuid! params[:id]
  @award = @student.awards.build
  @awards = @student.awards.load.where.not('id' => nil) # exclude empty row
end

private

  def set_course
    @course = Course.find_by_title!(params[:course_id])
  end

  def student_params
    params.require(:student).permit(:email, :uuid, :grade_point_average, :course_id)
  end

controllers/awards_controller.rb

before_action :set_variables

def create
  @award = @student.awards.build award_params
  if @award.save
    redirect_to course_student_path(@course, @student.uuid)
  else
    redirect_to course_student_path(@course, @student.uuid)
  end
end

private

  def set_variables
    @course = Course.find_by_title! params[:course_id]
    @student = @course.students.find_by_uuid! params[:student_id]
  end

  def award_params
    params.require(:award).permit(:ticket, :student_id)
  end

Now, I would expect my POST request sent from the form to look like this:

POST "/3344-2334/students/hh36-f4t4-545t/awards"

But this is what the server is getting

POST "/3344-2334/students/5/awards"

From which I receive an error:

ActiveRecord::RecordNotFound in AwardsController#create

Because it gets the :id (5) instead of the friendly_id :uuid (hh36-f4t4-545t).

Why is the parent (courses) getting a friendly_id :title but the child (students) getting the unfriendly :id? I am new to Rails and completely lost.

Answer 1

You can override the default returned param for the student model to give you the uuid instead of the id. Try put this in your student model.

def to_param
 uuid
end

you can also take a look at this, it may help you understand how friendlyId works.