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POEntity Framework, TPT Inheritance and Multi-Language support
 

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    <p>I have this DB Structure:</p> <p><strong>Service</strong></p> <ul> <li>Id int PK</li> <li>CategoryId FK</li> <li>SomeOtherFields</li> </ul> <p><strong>LocalizedService</strong></p> <ul> <li>LocalizedServiceId PK</li> <li>LanguageId FK</li> <li>Name</li> <li>Description</li> </ul> <p>As you can see, I have a base table called Service, and a LocalizedService table in which I'm writing multilingual data, such as name and description which should be translated in different languages. I have linked both tables in EF designer using TPT inheritance. Service is a base class of LocalizedService. The problem is that, TPT requires both tables to have primary key, which wouldn't be a problem if I was working on 1 language, but I should translate service rows across 3 different languages. So only LocalizedServiceId shouldn't be unique, but a combination of LocalizedServiceId + LanguageId should be unique because I can not insert more than one language row into LocalizedService. For example, take a look at LocalizedService rows bellow:</p> <ul> <li>1, 1, SomeService, NULL &lt;-- Inserted</li> <li>2, 1, AnotherService, NULL &lt;-- Inserted</li> <li>2, 2, RussianTranslationService, NULL &lt;-- can not insert because LocalizedServiceId with value 2 already exists in the table.</li> </ul> <p>That's not a problem on DB side, I can create PK for multiple fields (for example, LocalizedServiceId and LanguageId both will be Primary Key), but in this case, EF designer throws errors saying: "Error 13 Error 75: Key usage is not valid. uPay.Data.Entities.LocalizedServiceRecord cannot define keys because one of its base classes (uPay.Data.Entities.ServiceRecord) defines keys. D:\Projects\uPay\uPay.Data.Entities\Entities.edmx 1531 9 uPay.Data.Entities". I really need a solution on this problem ASAP, your help will be very appreciated. </p>
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