I'm trying to make a simple rails app where users can create any number of playlists. I am very new to rails and am wondering if I should be nesting the resources like this:
Rails.application.routes.draw do
resources :users do
resources :playlists
end
Doing it that way yields this when I rake routes:
Prefix Verb URI Pattern Controller#Action
user_playlists GET /users/:user_id/playlists(.:format) playlists#index
POST /users/:user_id/playlists(.:format) playlists#create
new_user_playlist GET /users/:user_id/playlists/new(.:format) playlists#new
edit_user_playlist GET /users/:user_id/playlists/:id/edit(.:format) playlists#edit
user_playlist GET /users/:user_id/playlists/:id(.:format) playlists#show
PATCH /users/:user_id/playlists/:id(.:format) playlists#update
PUT /users/:user_id/playlists/:id(.:format) playlists#update
DELETE /users/:user_id/playlists/:id(.:format) playlists#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
root GET / default_pages#home
signup GET /signup(.:format) users#new
signin GET /signin(.:format) users#signin
I can successfully get to /users/1/playlists in which I have this link (inside index.html.erb of playlists):
<%= link_to 'New Playlist', new_user_playlist_path(params[:user_id])%>
But clicking it gives me this error:
undefined method `playlists' for nil:NilClass
Extracted source (around line #18):
16 # GET /playlists/new
17 def new
18 @playlist = @user.playlists.new
19 end
20 # GET /playlists/1/edit
This is what my playlist_controller looks like:
class PlaylistsController < ApplicationController
before_action :set_playlist, only: [:show, :edit, :update, :destroy]
:set_user
# GET /playlists
# GET /playlists.json
def index
@playlists = Playlist.all
end
# GET /playlists/1
# GET /playlists/1.json
def show
end
# GET /playlists/new
def new
@playlist = @user.playlists.new
end
# GET /playlists/1/edit
def edit
end
# POST /playlists
# POST /playlists.json
def create
@playlist = @user.playlists.new(playlist_params)
respond_to do |format|
if @playlist.save
format.html { redirect_to @user.playlist, notice: 'Playlist was successfully created.' }
format.json { render :show, status: :created, location: @playlist }
else
format.html { render :new }
#format.json { render json: @playlist.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /playlists/1
# PATCH/PUT /playlists/1.json
def update
respond_to do |format|
if @playlist.update(playlist_params)
format.html { redirect_to @playlist, notice: 'Playlist was successfully updated.' }
format.json { render :show, status: :ok, location: @playlist }
else
format.html { render :edit }
format.json { render json: @playlist.errors, status: :unprocessable_entity }
end
end
end
# DELETE /playlists/1
# DELETE /playlists/1.json
def destroy
@playlist.destroy
respond_to do |format|
format.html { redirect_to playlists_url, notice: 'Playlist was successfully destroyed.' }
format.json { head :no_content }
end
end
private
def set_user
@user = User.find_by(params[:user_id])
end
# Use callbacks to share common setup or constraints between actions.
def set_playlist
@playlist = Playlist.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def playlist_params
params.require(:playlist).permit(:user_id, :title, :img)
end
end
My thought is that since the expected URL is supposed to look something like users/1/playlists/1, that I need to pass two variables, one for the user_id and one for a playlist id (of some sort) but I don't know exactly where/how...Can anyone help me out?
Thanks
