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AUTO: Fixes #2024: Fix doc per this document #2132

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Aug 10, 2021
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AUTO: Fixes #2024: Fix doc per this document #2132

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19 changes: 16 additions & 3 deletions docs/asciidoc/modules/ROOT/pages/virtual/graph-grouping.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,13 @@ This functionality is inspired by the work of https://twitter.com/kc1s[Martin Ju

Basically you can use any `+(entity)<-->(entity)+` graph for the grouping, support for graph projections is on the roadmap.

Here is an example using the dataset from `:play movies`.

.Example on movie graph
[source,cypher]
----
MATCH (n)
SET n.century = toInteger(coalesce(n.born,n.relased)/100) * 100;
SET n.century = toInteger(coalesce(n.born,n.released)/100) * 100;

CALL apoc.nodes.group(['Person','Movie'],['century']);
----
Expand Down Expand Up @@ -116,8 +118,20 @@ CALL apoc.nodes.group(['*'],['gender'],
[{`*`:'count', age:'min'}, {`*`:'count'} ])
----

image::
.Results
[opts="header", cols="4"]
|===
| nodes | relationships | node | relationship
| [{"identity":-45,"labels":["Person"],"properties":{"gender":"female","min_age":28,"count_*":2}}] | [{"identity":-68,"start":-45,"end":-44,"type":"MEMBER_OF","properties":{"count_*":3}},{"identity":-69,"start":-45,"end":-46,"type":"KNOWS","properties":{"count_*":2}}] | {"identity":-45,"labels":["Person"],"properties":{"gender":"female","min_age":28,"count_*":2}} | {"identity":-68,"start":-45,"end":-44,"type":"MEMBER_OF","properties":{"count_*":3}}
| [{"identity":-45,"labels":["Person"],"properties":{"gender":"female","min_age":28,"count_*":2}}] | [{"identity":-69,"start":-45,"end":-46,"type":"KNOWS","properties":{"count_*":2}}] | {"identity":-45,"labels":["Person"],"properties":{"gender":"female","min_age":28,"count_*":2}} | {"identity":-69,"start":-45,"end":-46,"type":"KNOWS","properties":{"count_*":2}}
| [{"identity":-46,"labels":["Person"],"properties":{"gender":"male","min_age":42,"count_*":1}}] | [{"identity":-70,"start":-46,"end":-44,"type":"MEMBER_OF","properties":{"count_*":1}}] | {"identity":-46,"labels":["Person"],"properties":{"gender":"male","min_age":42,"count_*":1}} | {"identity":-70,"start":-46,"end":-44,"type":"MEMBER_OF","properties":{"count_*":1}}
| [{"identity":-44,"labels":["Forum"],"properties":{"gender":null,"count_*":2}}] | [] | {"identity":-44,"labels":["Forum"],"properties":{"gender":null,"count_*":2}} | null
|===


Note that this query doesn't work in Neo4j Browser in "Graph" mode but only in "Table" mode (or also in cypher-shell) because,
since `Forum` does not have the `gender` property, in `node` result there will be a `"gender": null` property which is not supported and returns a `TypeError`.
Instead, the query below also works in "Graph" mode:

[source,cypher]
----
Expand All @@ -137,7 +151,6 @@ unwind range(1,1000) as id
create (u:User {id:id, age : id % 100, female: rand() < 0.5, name: "Name "+id, country:tld[toInteger(rand()*size(tld))]})
with collect(u) as users
unwind users as u
unwind range(1,10) as r
with u, users[toInteger(rand()*size(users))] as u2
where u <> u2
merge (u)-[:KNOWS]-(u2);
Expand Down