Ember form validation

I'm kind of new to Ember and I'm on something that should be quite simple. Just trying to validate a form actually. Using ember-forms and ember-validations.

Here is the part of the structure, I'll be quite exhaustive so you can get to the point but there is really not a lot of code:

 /app
   /controllers
     /admin
       /create-user.js
   /models
     /admin
       /create-user.js
   /routes
     /admin
       /create-user.js
   /templates
     /admin
       /create-user.js

First, I'm not sure it's the good structure, especially about the model.

The model:

import DS from 'ember-data';

export default DS.Model.extend({
  entity: DS.attr()
});

The controller:

import Ember from 'ember';
import EmberValidations from 'ember-validations';

export default Ember.Controller.extend(EmberValidations, {
  validations: {
    entity: {
      presence: true,
      length: { minimum: 5 }
    }
  },
  actions: {
    createUser() {
      console.log("create");
    }
  }
});

The route:

import Ember from 'ember';

export default Ember.Route.extend({
});

The template:

<h3>Create User</h3>

<div class="row">
  <div class="col-sm-6">
    {{#em-form action="createUser" model=create-user}}
      {{em-input
        label="Name / Entity"
        property="entity"
        placeholder="The name of the user or the entity"}}

    {{/em-form}}
  </div>
</div>

I know I'm missing something and I'm pretty sure it has to do with the model (I tried a lot of thing such as model=admin/create-user in the template).

EDIT: there's no error or whatever in the console, the validation is just not called.

Thx for your help!