/// <param name="targetClass">Class to which this FK points to</param>
/// <param name="fieldName">Property of this class, to where the FK points to</param>
/// <exception cref="ArgumentNullException">For the params className and fieldName</exception>
public ForeignKey(Type targetClass, string fieldName)
{
TargetClass = targetClass ?? throw new ArgumentNullException(nameof(targetClass));
TargetField = TargetClass.GetProperties().Where(x => x.Name == fieldName).First();
}