/// <summary>
/// Initializes a new instance of the <see cref="UserRole" /> class.
/// </summary>
/// <param name="id">A system-generated unique identifier for a UserRole (required).</param>
/// <param name="effectiveDate">The date on which the user was given the related role. (required).</param>
/// <param name="expiryDate">The date on which a role previously assigned to a user was removed from that user..</param>
/// <param name="role">A foreign key reference to the system-generated unique identifier for a Role.</param>
public UserRole(ObjectId id, DateTime effectiveDate, DateTime?expiryDate = null, Role role = null)
{
Id = id;
EffectiveDate = effectiveDate;
ExpiryDate = expiryDate;
Role = role;
}