/// <summary>
/// Creates a unique <paramref name="relation"/> between <paramref name="sourceKey"/> and <paramref name="targetKey"/>.
/// </summary>
/// <typeparam name="TVector"></typeparam>
/// <param name="query"></param>
/// <param name="sourceKey"></param>
/// <param name="targetKey"></param>
/// <param name="relation"></param>
/// <returns></returns>
public static ICypherFluentQuery Relate <TVector>(this ICypherFluentQuery query, string sourceKey, string targetKey, Relation relation) where TVector : Vector
{
query = query.CreateUnique(CreateUniquePattern <TVector>(sourceKey, "r", targetKey))
.WithParams(new { relation });
return(query);
}
