def create

  @article = Article.new(article_params)

  if @article.save

    redirect_to @article

  else

    render 'new'

  end

end

def update

  @article = Article.find(params[:id])

  if @article.update(article_params)

    redirect_to @article

  else

    render 'edit'

  end

end

private

  def article_params

    params.require(:article).permit(:title, :text)

  end

<h1>Edit article</h1>

<%= form_with(model: @article, local: true) do |form| %>

  <% if @article.errors.any? %>

    <div id="error_explanation">

      <h2>

        <%= pluralize(@article.errors.count, "error") %> prohibited

        this article from being saved:

      </h2>

      <ul>

        <% @article.errors.full_messages.each do |msg| %>

          <li><%= msg %></li>

        <% end %>

      </ul>

    </div>

  <% end %>

  <p>

    <%= form.label :title %><br>

    <%= form.text_field :title %>

  </p>

  <p>

    <%= form.label :text %><br>

    <%= form.text_area :text %>

  </p>

  <p>

    <%= form.submit %>

  </p>

<% end %>

<%= link_to 'Back', articles_path %>

def new

  @article = Article.new

end

def edit

  @article = Article.find(params[:id])

end

def create

  @article = Article.new(article_params)

  if @article.save

    redirect_to @article

  else

    render 'new'

  end

end