def METHOD_NAME(self):
    r"""
    Add :class:`VectorSpaces` to the super categories of ``self`` if
    the base ring is a field.
    EXAMPLES::
        sage: Modules(QQ).Filtered().is_subcategory(VectorSpaces(QQ))
        True
        sage: Modules(ZZ).Filtered().extra_super_categories()
        []
    This makes sure that ``Modules(QQ).Filtered()`` returns an
    instance of :class:`FilteredModules` and not a join category of
    an instance of this class and of ``VectorSpaces(QQ)``::
        sage: type(Modules(QQ).Filtered())
        <class 'sage.categories.vector_spaces.VectorSpaces.Filtered_with_category'>
    .. TODO::
        Get rid of this workaround once there is a more systematic
        approach for the alias ``Modules(QQ)`` -> ``VectorSpaces(QQ)``.
        Probably the latter should be a category with axiom, and
        covariant constructions should play well with axioms.
    """
    from sage.categories.modules import Modules
    from sage.categories.fields import Fields
    base_ring = self.base_ring()
    if base_ring in Fields():
        return [Modules(base_ring)]
    else:
        return []