弃用NEIGHBORS（）后如何使用UNION_DISTINCT（）或INTERSECTION（）

Question

I am new to ArangoDB and am trying to reproduce the results of https://docs.arangodb.com/3.0/cookbook/Graph/ExampleActorsAndMovies.html It turns out that functions like NEIGHBORS() are deprecated in 3.0. There is a migration guide https://docs.arangodb.com/3.0/cookbook/AQL/MigratingEdgeFunctionsTo3.html with which I manage to get

db._query("RETURN NEIGHBORS(movies, actsIn, 'TheMatrix', 'any')").toArray();

to work again as

db._query("FOR x IN ANY 'movies/TheMatrix' actsIn RETURN x._key").toArray();

However, I am at a loss how to use UNION_DISTINCT or INTERSECTION as the RETURN statement sits inside the loop, not outside. Also, I cannot seem to find any documentation on given functions anywhere?

For instance: "All actors who acted in both "movie1" AND "movie2" ?" would have been queried as

db._query("RETURN INTERSECTION(NEIGHBORS(movies, actsIn, 'TheDevilsAdvocate', 'any'), NEIGHBORS(movies, actsIn, 'TheMatrix', 'any'))").toArray();

which reads naturally coming from an sql background. But how would one go about this using above-mentioned for loop?

Any help would be much appreciated.

Answer 1

You can find the documentation for these functions here: https://docs.arangodb.com/3.0/AQL/Functions/Array.html

Your AQL for the cookbook-example should look like these:

UNION_DISTINCT

db._query("FOR x IN UNION_DISTINCT ((FOR y IN ANY 'movies/TheMatrix' actsIn RETURN y), (FOR y IN ANY 'movies/TheDevilsAdvocate' actsIn RETURN y)) RETURN x._id").toArray()

INTERSECTION

db._query("FOR x IN INTERSECTION ((FOR y IN ANY 'movies/TheMatrix' actsIn RETURN y), (FOR y IN ANY 'movies/TheDevilsAdvocate' actsIn RETURN y)) RETURN x._id").toArray()