Deleting nested objects

Question

I have a profile, and this profile has many cursos (courses). I show all the courses a profile has on the show.html.erb of this profile.

<% for curso in @profile.cursos %>
<li><%=h curso.nome %> - <%=h curso.universidade %><br>
Ingresso em: <%=h curso.ano_ingresso %> - Encerra em: <%=h curso.ano_termino %> 
<li>
<%= button_to 'Delete', { :action => "destroy", :id => curso.id },:confirm => "Are you sure?", :method => :delete %>

This way, I'm able to show all the courses a profile has on it's page, but the button_to delete just doesn't work. I have tried many things already, but I think I'm lost. Any idea on how I can create a link or a button or anything to delete the courses?

Community · Accepted Answer · 2020-06-20 09:12:55Z

4

In your routes file

resources :profiles do
    resources :courses
end

Then you can just use link_to method

<%= link_to "Delete", profile_course_path(profile, course), :method => :delete %>

Make sure you are providing the correct variables profile and course

Then in your courses_controller.rb you need to get the profile.

before_filter :get_profile

def get_profile
    @profile = Profile.find(params[:profile_id]) if params[:profile_id]
end

def destroy
  @course = Corse.find(params[:id])
  @course.destroy
  redirect_to profile_courses_path(@profile)
end

That will take you back to the correct profile url with it's nested courses.

update

For new courses you can use the following link:

<%= link_to "New Course", new_profile_course_path(profile) %>

That will take you to the new action in the courses controller.

You should read up on nested forms here.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 19, 2011 at 1:38

Sam 山

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3 Comments

Luk Over a year ago

Thansk for the answer! I guess this will work, but when I click on the delete link now it directs me to the form to create a new course. I don't know if this is because I have on my routes match '/profiles/:id_profile/cursos', :to => 'cursos#new', but without this match I can't create any new course. Any idea?

Sam 山 Over a year ago

just use the routes I set up. Delete that route and check the code for updates with a new course. You want to use nested links.

Luk Over a year ago

Thanks, now I can create the course and I'm getting better the idea. Made some changes to the link <%= link_to "Delete", profile_curso_path(@profile, curso), :method => :delete %> it now directs me to the link with cursos/:curso_id, but says there is no route to it. I added mannually a route for the destroy with the match and it works, but following what you said, this is "wrong". Any ideia how I can solve?

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