code: func (i *ImageDefinition) GetSizingOk() (string, bool) {
  	if i == nil || i.Sizing == nil {
  		return "", false
  	}
  	return *i.Sizing, true
  }
docs: // GetSizingOk returns a tuple with the Sizing field if it's non-nil, zero value otherwise
  // and a boolean to check if the value has been set.