Rails - Scaffold - controller setup - unknownFormat - ruby-on-rails

Question

I have been using Rails scaffolds to build a Rails 4 app.
My current problem is set out below - which arrives when I try and render the articles new page in my app:
ActionController::UnknownFormat
It's referring to the create action in the articles controller (it extracts this error location):
#article = Article.new(article_params)
respond_to do |format|
if #article.save
format.json { render :show, status: :created, location: #article }
else
I have an articles controller with:
class ArticlesController < ApplicationController
before_action :set_article, only: [:show, :edit, :update, :destroy]
# respond_to :html
# GET /articles
# GET /articles.json
def index
#articles = Article.all
end
# GET /articles/1
# GET /articles/1.json
def show
end
# GET /articles/new
def new
#article = Article.new
end
# GET /articles/1/edit
def edit
end
# POST /articles
# POST /articles.json
def create
# before_action :authenticate_user!
# authorize #article
#article = Article.new(article_params)
respond_to do |format|
if #article.save
format.json { render :show, status: :created, location: #article }
else
format.html { render :new }
format.json { render json: #article.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /articles/1
# PATCH/PUT /articles/1.json
def update
before_action :authenticate_user!
authorize #article
respond_to do |format|
if #article.update(article_params)
format.json { render :show, status: :ok, location: #article }
else
format.html { render :edit }
format.json { render json: #article.errors, status: :unprocessable_entity }
end
end
end
# DELETE /articles/1
# DELETE /articles/1.json
def destroy
before_action :authenticate_user!
authorize #article
#article.destroy
respond_to do |format|
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_article
#article = Article.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def article_params
params[:article].permit(:body, :title, :image,
comment_attributes: [:opinion])
end
end
I have respond with html in the top line of the controller. I don't know why or what this does. I have read others problems which say you need to give it something to respond to, or use the responder gem. I don't want anything extraordinary - I just want the page to render.
Can anyone see what's wrong here?

Answer 1

It seems like you need a format.html so you can add this:
#article = Article.new(article_params)
respond_to do |format|
if #article.save
format.html { redirect_to(#article,
:notice => 'Article was successfully created.') }
format.json { render :show, status: :created, location: #article }
else
format.json { render :show, status: :created, location: #article }
end
end
I hope this help you.

Answer 2

If you aren't trying to do anything extraordinary, here's how I would clean up this controller:
class ArticlesController < ApplicationController
before_action :set_article, except: [:new, :create, :index]
def index
#articles = Article.all
end
def show
end
def new
#article = Article.new
end
def edit
end
def create
#article = Article.new(article_params)
if #article.save
redirect_to #article
else
render :new
end
end
def update
if #article.update_attributes(article_params)
redirect_to #article
else
render :edit
end
end
def destroy
if #article.destroy
redirect_to articles_path
else
redirect_to #article
end
end
private
def set_article
#article = Article.find(params[:id])
end
def article_params
params[:article].permit(:body, :title, :image,
comment_attributes: [:opinion])
end
end
Note that I stripped out your authorization, so add it back in when everything is working.