Empty lang field when multilang_shop = true

[Rubens Cury]

Hi,

 

I'm developing a custom BO PS Module and I was experiencing a problem getting empty lang fields from the renderForm() controller method.

 

According this PS Doc http://doc.prestashop.com/display/PS15/Diving+into+PrestaShop+Core+development we should use one of those types of model for "many stores and/or languages"

 

In order to have an object in many languages:

'multilang' => true

In order to have an object depending on the current store

'multishop' => true

In order to have an object which depends on the current store, and in many languages:

'multilang_shop' => true

 

Indeed, what I just noticed is that right after I changed my class definition from 'multilang_shop' => true to 'multilang' => true, all my lang fields started to work out returning their correspondent values instead of empty values as previously. 

 

My question is how and why the definition 'multilang_shop' => true could prevent the lang fields to work properly? Or, any idea about what I would be doing wrong? 

 

Thank you all

Rubens Cury