private void CheckKeyNotInUse(Key key)
{
var foreignKey = Model?.FindReferencingForeignKeys(key).FirstOrDefault();
if (foreignKey != null)
{
throw new InvalidOperationException(Strings.KeyInUse(Property.Format(key.Properties), Name, foreignKey.DeclaringEntityType.Name));
}
}
public virtual IEnumerable <ForeignKey> FindReferencingForeignKeys() => Model.FindReferencingForeignKeys(this);
public void Can_get_referencing_foreign_keys()
{
var model = new Model();
var entityType1 = model.AddEntityType(typeof(Customer));
var entityType2 = model.AddEntityType(typeof(Order));
var keyProperty = entityType1.AddProperty("Id", typeof(int));
var fkProperty = entityType2.AddProperty("CustomerId", typeof(int?));
var foreignKey = entityType2.GetOrAddForeignKey(fkProperty, entityType1.AddKey(keyProperty), entityType1);
var referencingForeignKeys = model.FindReferencingForeignKeys(entityType1);
Assert.Same(foreignKey, referencingForeignKeys.Single());
Assert.Same(foreignKey, entityType1.FindReferencingForeignKeys().Single());
}