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POObjectContext.SaveChanges() violates primary key, throws UpdateException?
 

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    <p>Paraphrasing from <a href="http://msdn.microsoft.com/en-us/library/dd283139.aspx" rel="nofollow noreferrer">this MSDN documentation</a> ...</p> <blockquote> <p>An INSERT statement is generated by the Entity Framework and executed on the data source when SaveChanges is called on the ObjectContext. </p> <p>If the INSERT operation succeeds, server-generated values are written back to the ObjectStateEntry. When AcceptChanges is called automatically at the end of the SaveChanges execution, a permanent EntityKey is computed by using the new server-generated values.</p> </blockquote> <p>This does not seem to be occurring in my code. When I call <code>ObjectContext.SaveChanges()</code>, an <code>UpdateException</code> is thrown with <code>InnerException.Message</code> value:</p> <blockquote> <p><strong>"duplicate key value violates unique constraint student_term_data_pkey"</strong></p> </blockquote> <p>Here is the offending code:</p> <pre><code>using (DataAccessLayerEntities context = new DataAccessLayerEntities()) { StudentTermData mostCurrent = new StudentTermData() { // Foreign keys: StudentId = studentId, TermId = currentTerm.Id, // Non-nullable properties: SponsorCode = string.Empty, AdmissionNumber = string.Empty, Expiration = string.Empty }; context.StudentTermDatas.AddObject(mostCurrent); context.SaveChanges(); // UpdateException occurs here. } </code></pre> <p>I have verified that <code>StudentTermData.Id</code> is marked as an EntityKey in my Entity data model. Does anyone have any ideas or suggestions?</p>
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    1. COCan you should the DDL for StudentTermData, in particular the Id field, is it actually being generated on the server?
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      1. USIan Mercer
    2. COAny reason you are using the Id fields and adding the StudentTermData to the objectContext manually instead of simply doing `mostCurrent.Students.Add(student)` and `mostCurrent.Term = currentTerm` after creating an instance of it? (Assuming you can use a single objectContext to load them and apply them)
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    3. COThe student ID is obtained as-is from the SelectedValue of a ComboBox, which isn't bound to a collection of Students, so that's why I don't use mostCurrent.Students.Add(student). Also, the term is passed as an argument to the function after being loaded by a separate ObjectContext.
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