آرایه data به این صورت هست که باید ذخیره بشه.
مدل3 و ارتباطاتش ذخیره نمیشه
[data] => Array

(

    [Model1] => Array

        (

            [field1] => some info

            [field2] => some info

        )



    [Model2] => Array

        (

            [0] => Array

                (

                    [field1] => some info

                    [field2] => some info

                    [field3] => some info

                )

        )



    [Model3] => Array

        (

            [0] => Array

                (

                    [field1] => some info

                )

        )

)