[symfony-users] Is it possible to add values to fields: extension and mime_type after submit form and before $form->save() ?

[dziobacz]

I have table for uploaded images:

Image:
  actAs: { Timestampable: ~ }
  columns:
    description:
      type: string(200)
    name:
      type: string(250)
      notnull: true
    extension:
      type: string(10)
      notnull: true
    mime_type:
      type: string(250)
      notnull: true

I have form to upload images from which I have deleted fields:
extension and mime_type (because I don't know them before upload
image). In action I have:
if ($request->isMethod('post'))
{
      $this->form->bind(...);
      if ($this->form->isValid())
      {
           .........
          $form->save();
      }
}

Is it possible to add values to fields: extension and mime_type after
submit form and before $form->save() ??

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