Question

I have my models setup as follows:

 class User
 has_many :memberships, :dependent => :destroy
 has_many :groups, :through => :memberships

 Class Group
 has_many :memberships, :dependent => :destroy
 has_many :users, :through => :memberships

 Class Membership
 attr_accessible :user_id, :group_id
 belongs_to :user
 belongs_to :group

My MembershipController#create

def create
  @membership = current_user.memberships.build(:group_id => params[:group_id])
  if @membership.save
    flash[:notice] = "You have joined this group."
    redirect_to :back
  else
    flash[:error] = "Unable to join."
    redirect_to :back
  end
end

I have resources :memberships in my routes so that it can find the create action.

Finally in my Group#show action I want a user to be able to join a group. So I created this form_tag

<%= form_tag(membership_path) do %>
    <%= hidden_field_tag @group.id %>
    <%= submit_tag "Join Group"%>
<% end %>

This returns the following error:

Routing Error

No route matches [POST] "/memberships/1"

I have run a rake routes to try and understand what I am missing here:

memberships GET /memberships(.:format) {:action=>”index”, :controller=>”memberships”}
POST/memberships(.:format) {:action=>”create”, controller=>”memberships”}
new_membership GET /memberships/new(.:format) {:action=>”new”,controller=>”memberships”}
edit_membership GET /memberships/:id/edit(.:format){:action=>”edit”, controller=>”memberships”}

membership GET /memberships/:id(.:format) {:action=>”show”, :controller=>”memberships”}
PUT /memberships/:id(.:format){:action=>”update”, :controller=>”memberships”}
DELETE /memberships/:id(.:format) {:action=>”destroy”, :controller=>”memberships”}

Anyone see the error of my ways?

Answer 1

Don’t you want to be posting to memberships_path rather than membership_path? It looks like the error is indicating it can’t find a POST route for a membership due to the fact that there is actually no route for :membership for POST, :only memberships.