human
Solve the following python programming problem given the following code:
def contribute_to_class(self, cls, name) : 
    if (VERSION < (1, 7)) : 
        self.name = self.column = self.attname = name 
else : 
        self.set_attributes_from_name (name) 
self.model = cls 
    self.opts = cls._meta 
    cls._meta.add_field (self) 
    setattr (cls, name, self) 
    if (not cls._meta.abstract) : 
        if (VERSION >= (1, 9)) : 
            if isinstance (self.remote_field.model, six.string_types) : 
                def resolve_related_class(cls, model, field) : 
                    field.remote_field.model = model 
lazy_related_operation (resolve_related_class, cls, self.remote_field.model, field = self) 
else : 
            if isinstance (name.rel.to, six.string_types) : 
                def resolve_related_class(field, model, cls) : 
                    field.rel.to = model 
add_lazy_relation (cls, self, self.rel.to, resolve_related_class) 
if isinstance (self.through, six.string_types) : 
            if (VERSION >= (1, 9)) : 
                def resolve_related_class(cls, model, field) : 
                    self.through = model 
                    self.remote_field.through = model 
                    self.post_through_setup (cls) 
lazy_related_operation (resolve_related_class, cls, self.through, field = self) 
else : 
                def resolve_related_class(field, model, cls) : 
                    self.through = model 
                    _remote_field (self).through = model 
                    self.post_through_setup (cls) 
add_lazy_relation (cls, self, self.through, resolve_related_class) 
else : 
            self.post_through_setup (cls) 

    
    

    Fix the buggy line: if isinstance (name.rel.to, six.string_types) :
assistant
#Here is Python code to fix the buggy line: if isinstance (name.

if isinstance (self.rel.to, six.string_types) :