Symfony2 - Twig : Set the default value in the dropdownlist

Question

I have a Form in my twig template. One of the form fields is a dropdownlist that is created from an Entity in my form builder.

I would like to set the default value

Answer 1

as @Elium1984 suggested

{{ form_widget(form.type, {value: twig_var ~ "" } ) }} 

or

{{ form_row(form.type, {value: twig_var ~ "" } ) }}