# models.helpers.related\_names\_validation #### validate\_related\_names\_in\_relations ```python validate_related_names_in_relations(model_fields: Dict, new_model: Type["Model"]) -> None ``` Performs a validation of relation_names in relation fields. If multiple fields are leading to the same related model only one can have empty related_name param (populated by default as model.name.lower()+'s'). Also related_names have to be unique for given related model. **Raises**: - `ModelDefinitionError`: if validation of related_names fail **Arguments**: - `model_fields (Dict[str, ormar.Field])`: dictionary of declared ormar model fields - `new_model (Model class)`: