finding Mutual Friends

Hi , Thanks again for this awesome library.

Here is the raw Query in Gremlin to get mutual friends.

g.V(FirstUserId).both("Friend").where(both("Friend").is(eq(SecondUserId)))

The closest query I was able to write is below but it always return all the friends of first user as I was not able to write equivalent statement of .is(eq(SecondUserId)

await _g.V(FirstUserId).Both<Friend>()
                   .Where(l => l.Both<Friend>().V(SecondUserId)).Dedup().OfType<User>();

Thank you

reference links

1. https://groups.google.com/forum/#!topic/gremlin-users/Saw7hvOPrcM
2. https://stackoverflow.com/questions/36516914/get-a-list-of-common-friends-between-more-than-2-users-in-graph-database

[danielcweber]

Then more like…

var mutualFriends = await _g.V(_marko.Id)
    .Both<Knows>()
    .OfType<Person>()
    .Fold()
    .As((__, markosFriends) => __.V(friend1.Id, friend2.Id)
        .Both<Knows>()
        .OfType<Person>()
        .Dedup()
        .Where(otherFriend => markosFriends.Value.Contains(otherFriend)));

?

[danielcweber]

How about

var mutualFriends = await _g.V(_marko.Id)
    .Both<Knows>()
    .OfType<Person>()
    .Fold()
    .As((__, markosFriends) => __.V(_peter.Id)
        .Both<Knows>()
        .OfType<Person>()
        .Where(petersFriend => markosFriends.Value.Contains(petersFriend))
        .Fold()
        .As((__, markosAndPetersFriends) => __.V(_josh.Id)
            .Both<Knows>()
            .OfType<Person>()
            .Where(joshsFriend => markosAndPetersFriends.Value.Contains(joshsFriend ))));

A great place to start learning Gremlin is the official documentation. You need to be familiar with Gremlin concepts to make the most of ExRam.Gremlinq. The sample graph in ExRam.Gremlinq.Samples is directly taken from the official docs.