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POWhat is the difference between an MVC Model object, a domain object and a DTO
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copied!<p>What is the difference between a MVC Model object, a domain object and a DTO?</p> <p>My understanding is:</p> <p>MVC Model object:</p> <p>Models the data to be displayed by a corresponding view. As such may not map directly on to a domain object, i.e. may include data from one or more domain objects.</p> <ol> <li>Client side</li> <li>May contain business logic, e.g. validation, calculated properties, etc</li> <li>No persistence related methods</li> </ol> <p>Domain object:</p> <p>Object that models a real world object in the problem domain like Reservation, Customer, ORder, etc. Used to persists data.</p> <ol> <li>Server side</li> <li>No business logic</li> </ol> <p>DTO (Data Transfer Object):</p> <p>An object used to transfer data between layers when the layers are in separate processes, e.g. from a DB to a client app. Allows a single transaction across the wire rather than multiple calls. A DTO contains just data and accessor methods, no logic. The data is for a particular DB transaction so may not may directly on to a domain object, i.e. may include data from one or more domain objects.</p> <ol> <li>Used on both sides as passed between layers</li> <li>No business logic</li> <li>No persistence related methods</li> </ol> <p>So to the questions:</p> <p>(1) Is my understanding correct? Am I missing some key points?</p> <p>(2) Are there any reasons not to use Domain objects as the MVC Model assuming that the Model objects do not require extra business logic?</p> <p>(3) Are there any reasons not to use DTOs as the MVC Model assuming that the Model objects do not require extra business logic?</p> <p>Thanks.</p> <p>Tim</p>

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