Question

friendships_controller.rb

class FriendshipsController < ApplicationController

  # POST /friendships
  # POST /friendships.json
  def create

    #@friendship = Friendship.new(params[:friendship])
    @friendship = current_user.friendships.build(:friend_id => params[:friend_id])

    respond_to do |format|
      if @friendship.save
        format.html { redirect_to user_profile(current_user.username), notice: 'Friendship was successfully created.' }
        format.json { render json: @friendship, status: :created, location: @friendship }
      else
        format.html { redirect_to user_profile(current_user.username), notice: 'Friendship was not created.' }
        format.json { render json: @friendship.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /friendships/1
  # DELETE /friendships/1.json
  def destroy
    @friendship = Friendship.find(params[:id])
    @friendship.destroy

    respond_to do |format|
      format.html { redirect_to friendships_url }
      format.json { head :no_content }
    end
  end
end

when i go to http://localhost:3000/friendships?friend_id=1 i get

Unknown action

The action 'index' could not be found for FriendshipsController

I followed this tutorial : http://railscasts.com/episodes/163-self-referential-association

Answer 1

You probably configured the create as a POST not a GET.

  # POST /friendships
  # POST /friendships.json
  def create

This is also the case if you used scaffolding to create a skeleton of your controller. You could change this in the routes configuration. But be aware, that creating stuff via GET is no longer seen as completely conform to the REST paradigm.