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Now that everyone is talking about MVC, I notice that the business rules are not being addressed. In the old days of the 3-tier architecture, The business rules were in the middle layer. Where do they fall in the new MVC?
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A1: Business Logic goes to Model part in MVC . Role of Model is to contain data and business logic. Controller on the other hand is responsible to receive user input and decide what to do. A2: A Business Rule is part of Business Logic .
Business rules provide a simple interface to implement and maintain fast-changing and commonly used rules. They can be applied to main and quick create forms. Business rules work in model-driven apps, legacy web apps, Dynamics 365 for tablets, and Dynamics 365 for Outlook (online or offline mode).
Two common types of business rules are formula rules and decision table rules.
The reason you never see MVC address "Business Rules" is that MVC by and large is a presentation pattern. It's focused on how to structure your application. The Model, for example, can be thought of as a presentation model. The model of your application, which the view then renders.
However, in order to create the presentation model, you generally need to go to your domain models where all your business logic lives. At that point, MVC doesn't dictate where that code physically live. Is it on another tier? MVC doesn't care.
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