articles_controller.rb

# POST /articles
def create
  @article = Article.new(article_params)

  if @article.save
    redirect_to @article, notice: 'Article was successfully created.'
  else
    render :new
  end
end

# PATCH/PUT /articles/1
def update
  if @article.update(article_params)
    redirect_to @article, notice: 'Article was successfully updated.'
  else
    render :edit
  end
end