code: def find_field_meta(obj, value):
      
      if "__" in value:
          value_list = value.split("__")
          child_obj = obj._meta.get_field(value_list[0]).rel.to
          return find_field_meta(child_obj, "__".join(value_list[1:]))
      return obj._meta.get_field(value)
docs: In a model, finds the attribute meta connected to the last object when
      a chain of  connected objects is given in a string separated with double
      underscores.