Macro admin 

macro_rules! admin {
    (
        $(
            $key:ident : $($model:ident)::+ => $form:ident {
                title: $title:literal ,
                permissions: [ $($perm:literal),* $(,)? ]
                $(, edit_form: $edit_form_path:path)?
                $(, list_display: [ $([$display_col:literal, $display_label:literal]),* $(,)? ])?
                $(, list_filter: [ $([$filter_col:literal, $filter_label:literal $(, $entry_limit:literal)?]),* $(,)? ])?
                $(,)?
            }
        )*
    ) => { ... };
}