Thanks all for your reply. I understand the method you mentioned, but it doesn't work for this case (Comment is an associated class with Blog). Here is the code of _form.html.erb in views/comments folder:
1 2 <%= form_with(model: [@article, @article.comments.build], local: true) do |form| %> 3 <% if @article.errors.any? %> 4 <div id="error_explanation"> 5 <h2> 6 <%= pluralize(@article.errors.count, "error") %> prohibited this article from being saved: 7 </h2> 8 <ul> 9 <% @article.errors.full_messages.each do |msg| %> 10 <li> <%= msg %> </li> 11 <% end %> 12 </ul> 13 <% end %> 14 15 <p> 16 <%= form.label :commenter %><br> 17 <%= form.text_field :commenter %> 18 </p> 19 <p> 20 <%= form.label :body %><br> 21 <%= form.text_area :body %> 22 </p> 23 <p> 24 <%= form.submit %> 25 </p> 26 <% end %> ~ ~ Please let me know if you need more information. Thanks and Regards, Jason On Thu, Dec 27, 2018 at 6:06 AM fugee ohu <fugee...@gmail.com> wrote: > if @object.errors.any? > > On Wednesday, December 26, 2018 at 5:58:32 AM UTC-5, jason cao wrote: >> >> Hi, >> >> How can I show error messages if a comment is invalid? E.g. when a >> comment body is empty. I add validation in the model class, and the >> validation itself works, but it won't show any error message. Can you >> please help? Many thanks! >> >> Regards, >> Jason >> > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rubyonrails-talk+unsubscr...@googlegroups.com. > To post to this group, send email to rubyonrails-talk@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/22f1eb0d-6af1-440a-8aff-e4c539bf1a37%40googlegroups.com > <https://groups.google.com/d/msgid/rubyonrails-talk/22f1eb0d-6af1-440a-8aff-e4c539bf1a37%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CALeWamRkNJhcxniBGLYQXOnUWh61FOAwNkak4eVg%3DBE%3D5Y%3DVTw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
