MVC 4 Code First ForeignKeyAttribute on property … on type … is not valid

Question

I keep getting this error and I do not know why.

The ForeignKeyAttribute on property \'Ward\' on type \'BioSheet.Models.BioSheetModel\' is not valid. The foreign key

Answer 1

[ForeignKey("WardId")] indicates that the property to use as a foreign key to the Ward table should be the WardId property on the BioSheetModel class.

You're getting the error because you haven't defined a WardId property on the BioSheetModel class.

Add

public int WardId {get; set;}

for a non-nullable/required relationship, or

public int? WardId {get; set;}

for a nullable/optional relationship.