How can data validations be enforced in Mendix?

Data validations in Mendix are primarily enforced through validation rules defined in the domain model. This approach allows developers to create specific criteria that data must meet before it can be accepted into the system. These rules can be applied to various entity attributes, ensuring that the data adheres to the required formats, ranges, and logical conditions.

For instance, you might define a rule that ensures a certain attribute cannot be empty or must be a valid email format. By implementing these rules at the domain model level, validations are consistently enforced across the application, ensuring data integrity and reducing errors that may arise from invalid user input.

While other methods, such as using external validation services, can complement the validation process, the fundamental enforcement of data validations originates from the rules set in the domain model. This ensures that all data entering the system is subject to the same validations, irrespective of how it is input, whether through the user interface or external integrations.