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I had this problem a couple days ago and Telerik's support was a huge help. It stemmed from the fact that I was trying to query a view. View's have no primary key and this caused a problem for the ORM. If you are using the Domain Model approach, find the table or view in the domain model. Select the column(s) that you would like to be part of the primary key and in the properties for that column set the Identity field equal to true.
If it is a table you may want to make sure you specified primary keys on the table inside the database. Hope that helps.
Hi Steve, This is not an issue in the product. When the Identity Mechanism of a specific type is not explicitly set, the default setting is used which is HIGHLOW key generator.
When the HIGHLOW key generator mechanism is being used, OpenAccess requires the voakeygen table to be present in the database as that is the table where it preserves the last used id values for each table that has this identity mechanism. When you first initialize a context or create a Database object as an entry point to OpenAccess, the runtime collects all of the metadata required in order to operate correctly with a certain persistent model. If there are problems with the metadata, OpenAccess throws exception regardless of whether you have accessed the exact entity that causes the invalid metadata or not. Sincerely yours, Damyan Bogoev the Telerik team. Just a note on the documentation - I ran into this and did a search on the help file and it came back with a list of various identity mechanisms (hilow, guid, etc) and the documentation referred to an option 'None' which just isn't available in the properties pane.
I'm doing a lot of queries off of views from my db and I was hoping to just tell it to use 'None' but couldn't, anyway, just set one of the columns to be the identity field and now all is happy. But I'd recommend updating the docs with this info. Hi Michael, Thank you for the feedback.
We understand that this error can be very frustrating. For that reason we have created a that will help you identify all of those cases, and a validation action that can fix them for you. I am not sure if we can actually make this process more automated, as in the absence of a primary key column if would be risky for OpenAccess ORM to try guessing the best option - it is much better to leave that choice to you. As for the specific case of the database views, we do plan to improve the process of reading them from the database so that we can have an idea what should the identity be. However, I cannot yet provide you with a time frame for releasing that feature.
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What we have done recently for Q3 2012 (already live) is to change the that a persistent type doesn't have a primary key to an error, which means that even on the Visual Designer surface you know that the model will have serious problems during runtime. I hope that helps.
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Kind regards, Ivailo the Telerik team.