How to handle request from $_POST where no Symfony form is defined on the request, without searching form classname?

Question

How can I handle request data from the $_POST data itself. I mean if I try to handle the form like this: $form->handleRequest($request);, Symfony would try to get the data from $_POST['form_classname'], but I want to fill my form class straight from base $_POST variables.

Actually I want to handle the information from the outer site. And I have to develop something like an API. But without authorization, tokens, etc...

So I decided to build the form with some properties I need. After validation the form might do some logic.

Here is an example of $_POST I have to handle

Function=TransResponse&RESULT=0&RC=00&AUTHCODE=745113

As you can see, there is no form name in request. The $form->handleRequest($request); works only if the request was like an

[form_name][Function]=TransResponse&[form_name][RESULT]=0&[form_name][RC]=00&[form_name][AUTHCODE]=745113

But I can't change the request format.

Answer 1

Just put in your form class

/** @inheritdoc */
function getBlockPrefix() {
    return '';
}

Here is the information about this method Documentation