MVC :: Working With Parent Child Entities?
Sep 22, 2010
i am working on POCO entities. i had a requirement to provide Edit feature for parent and respective Child records in single View.
Eg: Parent-Customer, Child-Order tables
when updating the parent entity by using => UpdateModel(CustomerIns);
and updating the child entity by using => TryUpdateModel(CustomerIns.Order, "Orders");
The Child Controls Names are like Orders[0].OrderID,Oders[0].OrderDate,etc
The Parent and Child Entities are updating when UpdateModel() is called but when saving Changes by calling Context.SaveChanges() i am getting exception like:
"The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable. When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another non-null value, or the unrelated object must be deleted."
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Apr 21, 2010
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Jun 12, 2010
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Jan 16, 2010
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}
public class OrderLine
{
public virtual string Product { get; set; } // Simplified
}
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[code]....
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[code]...
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[Code]....
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for example:
[Code]....
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[Code]....
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[Code]....
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