[Rails] Form validation Rails 5.1.4

Hello,

I've read the rails introduction and followed the examples. It was quite understandable. But the form validation didn't work as expected.

My form begins with

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

  <% if @article.errors.any? %>

...

and in the class is the validation rule:

validates :title, length: { minimum: 5 }

...

part of the controller:

def update

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

if @article.update(article_params)

redirect_to @article

else

render :edit

end

end

the problem is:

if the title is too short (for example) I can push the update-button but nothing happens. There is no reload of the page at all, no errors are shown. Is the title is long enough, the submit-button works correctly. Do I change the form_with to (scope: :article, ...) then the errors are shown.

I use Rails 5.1.4 

Thx for a response

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