Question

I am able to render a form in HAML but I am not sure how to validate it.

Here is what I have so far:

  #disclosure-form-container
    = form_for([:mobile,@disclosure], :html => {:id => "disclosure-form", :remote => true}) do |f|
      %p
        =f.label :display_as, (t :select_disclosure_type)
        =f.select :display_as, options_from_collection_for_select(Disclosure.basics, :display_as, :name, f.object.display_as)
      %p
        =f.label :notes, (t :notes)
        =f.text_area :notes, :class => "#{validation_rules(:free_disclosure_notes)}", :rows => 5 , :id => "disclosure_notes_entry"
        = buttonset({:submit_label => (t "buttons.influencers.disclosures.create"),:submit_css_class => "call-to-action",:cancel_url => "#",:direction => :left_to_right})

This renders a form with two fields and a button to click submit. But what if people just enter submit without doing much? Where do I put the validation code and how do I validate this form?

Thanks!

Answer 1

A user enters data that should be saved in your model and then stored in your DB. So it’s naturally to implement validation on model-level. Rails allows you to create validation for models easy. Here you can read about it. In a few words: adding few lines to your model prevent it to be saved with inconsistent data.

But you can in addition to model-level validation use client-side validation: i.e., data will be checked before sending to server. This way user don’t have to submit form to find out that he forgot to fill some required field. But of course this can’t be any guaranty as it’s easy to bypass. Here more about client-side validation.

So, as you see, Haml can’t help you with validations. It’s a great tool, but not for this purpose.