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ormar/docs/api/models/helpers/related-names-validation.md
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<a name="models.helpers.related_names_validation"></a>
# models.helpers.related\_names\_validation
<a name="models.helpers.related_names_validation.validate_related_names_in_relations"></a>
#### 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`):