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I can't figure out how to do a post request for this. Spring Data JPA- Foreign Keys- Composite Keys

 
Ranch Hand
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I have a Student class



A StudentIdentity class.  



And the post method in the controller class.  



I've tried it several different ways in Postman and I get a 400 Bad Request error.  


Does anyone have an idea how you would do this given the class has foreign and composite keys?  
 
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I think you can first try to remove the school attribute in your studentIdentity id.
Your student identity can include some unique attributes related to the students, such as id number.
But the school is a relationship to the student.

 
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