<form id="myForm" name="myForm">
            <div class="form-group">
                <label for="id_usu">id</label>
                <input class="form-control" type="number" id="id_usu" name="id_usu" placeholder="ID usuario" ng-model="user.id">
            </div>
            <div class="form-group">
                <label for="foto">Foto</label>
                <input class="form-control" type="file" id="foto" name="foto" placeholder="Foto" file-model="user.foto">
                <p ng-if='user.foto'>
                    The name of your file is {{ user.foto.name }} and the size is of {{ user.foto.size }} bytes.
                </p>
            </div>
            <div class="form-group">
                <label for="email">Mail</label>
                <input class="form-control" type="text" id="email" name="email" placeholder="Email usuario" ng-model="user.email" required>
            </div>
            <div class="form-group">
                <label for="username">Nombre</label>
                <input class="form-control" type="text" min="1" max="150" id="username" name="username" placeholder="Nombre usuario" ng-model="user.username">
            </div>
            <div class="form-group">
                <label for="password">Password</label>
                <input class="form-control" type="password" min="1" max="150" id="password" name="password" placeholder="Contraseña" ng-model="user.password" required>
            </div>
            <div class="col-lg-12 form-group">
                <input class="btn btn-primary" type="submit" value="Añadir Usuario" ng-class="{'disabled': myForm.$invalid}" ng-click="newUser(user)">
            </div>
        </form>

newUser : function(user){
                        var usuarioForm = new FormData(document.getElementById("myForm"));

                        global = $http.post(path+'users', usuarioForm );
                        return global;}

$usuario = new Usuario();
    $form = $this->createForm(new NuevoUsuarioFormType('...Usuario'), $usuario);
    $json_data = json_decode($request->getContent(),true);
    $form->bind($json_data);

var config = {
                            headers : {
                                   'Content-Type': undefined
                               },
                            transformRequest: angular.identity
                        };

                        global = $http.post(path+'users', usuarioForm,config);
                        return global;

$foto = $request->files->get('foto');
    $pass = $request->request->get('password');