Can you explain what is meant by the term 'fat model' in the context of software development?

The term "Fat Model" in software development usually refers to an approach where all business logic and rules are contained within the data model, while controllers and views remain as simple as possible.

This means that the model includes not only properties and data access methods but also methods that implement processing logic, validation, calculations, and interaction with other objects.

Advantages of this approach:

• Centralization of business logic in one place.
• Simplified testing, as the logic is concentrated in the model.
• Controllers become thinner and simpler.

However, if the model becomes too large and complex, it can lead to maintenance difficulties, so it is important to maintain a balance and, if necessary, allocate service layers.