Symfony2 validation form without class - forms

Question

I'm trying to make a search form without an entity.
Controller:
public function SearchFormAction() {
$collectionConstraint = new Collection(array(
'size' => new MinLength(3),
));
$searchform = $this->createFormBuilder(null, array(
'validation_constraint' => $collectionConstraint,
))
->add('min_range')
->add('max_range')
->add('bedrooms')
->add('bathrooms')
->add('size')
->add('user')
->getForm()
;
return $this->render("RealBundle:User:search.html.twig", array(
'searchform' => $searchform->createView(),
));
}
View:
<div id="dialog" title="Advanced Search">
<form action="{{ path('searchresults') }}" method="post" {{ form_enctype(searchform) }} id="frmSearch">
<fieldset>
<h3>Properties</h3>
<div class="form-search-item">
{{ form_label(searchform.min_range, 'Price Range') }} {{ form_widget(searchform.min_range) }} to {{ form_widget(searchform.max_range) }}
{{ form_widget(searchform.min_range) }}
</div>
<div class="form-search-item">
{{ form_label(searchform.bedrooms, 'Bedrooms') }}: {{ form_widget(searchform.bedrooms) }}
</div>
<div class="form-search-item">
{{ form_label(searchform.bedrooms, 'Bathrooms') }}: {{ form_widget(searchform.bathrooms) }}
</div>
<div class="form-search-item">
{{ form_label(searchform.bedrooms, 'Size') }}: {{ form_widget(searchform.size) }}
</div>
<h3>User</h3>
<div class="form-search-item">
{{ form_label(searchform.user, 'User') }}: {{ form_widget(searchform.user) }}
</div>
{{ form_rest(searchform) }}
<input type="submit" value="Search">
</fieldset>
</form>
I've try with another validations like MinLength, MaxLenght, Type and nothing works for me, what am I doing wrong?
I want to validate, range, bedrooms, bathrooms, size as integers, and a minLenght for user.
Tnx and sorry for my english.

Answer 1

Your validation seems to be working in my test. But you're missing the error messages in the template.
You need
{{ form_errors(form) }}
to render global errors, and then for each field you can display its errors, eg
{{ form_errors(form.size) }}
Then as if by magic you should see your error messages. Although not having seen your controller I can't be sure you're binding and calling isValid.
If you're still having problems then please post your controller too.