class_docstr: A class for representing multivariate rational function fields. 
docstr: Returns a field associated with ``self``. 
code: def get_ring(self):
      """Returns a field associated with ``self``."""
      return self.field.to_ring().to_domain()
  
imports: from sympy.polys.domains.compositedomain import CompositeDomain
  from sympy.polys.domains.field import Field
  from sympy.polys.polyerrors import CoercionFailed, GeneratorsError
  from sympy.utilities import public
label_desc: Use image node_id 24 for calling the FractionField obj's underlying member method code with example usage: obj.get_ring() and returns: self