How to get the closest nodes in Cypher? - neo4j

Question

Based on the model here, I am trying to find the closest meeting room based on the proximity of the rooms in this model. I wanted to the results like this,
+-------+----------+--+
| Room | Distance | |
+-------+----------+--+
| room1 | 3 | |
| room2 | 3 | |
| room3 | 4 | |
| room4 | 4 | |
+-------+----------+--+
My model:
I have tried this query:
MATCH (p:Person {name:"test"})-[r*2..]->(f:Floor)<-[:ROOM_LOCATED_IN_FLOOR]-(r:Room)
RETURN p, f, r
which just gives the meeting rooms the person is located. But I wanted to traverse through other rooms in different floors.

Answer 1

Here a sample data for testing:
CREATE (p:Person)
CREATE (d:Desk)
CREATE (f1:Floor)
CREATE (f2:Floor)
CREATE (r1:Room {name : 'room1'})
CREATE (r2:Room {name : 'room2'})
CREATE (r3:Room {name : 'room3'})
CREATE (r4:Room {name : 'room4'})
CREATE (p)-[:SEATED_AT]->(d)-[:LOCATED_IN]->(f1)-[:HAS_NEXT]->(f2)
CREATE (f1)<-[:PART_OF]-(r1)
CREATE (f1)<-[:PART_OF]-(r2)
CREATE (f2)<-[:PART_OF]-(r3)
CREATE (f2)<-[:PART_OF]-(r4)
Then, you can get the desired result with size() and relationships() functions:
MATCH p = (:Person)-[*]-(r:Room)
RETURN r.name as Room, size( relationships(p) ) as Distance
ORDER BY Distance
The output will be:
╒═══════╤══════════╕
│"Room" │"Distance"│
╞═══════╪══════════╡
│"room1"│3 │
├───────┼──────────┤
│"room2"│3 │
├───────┼──────────┤
│"room3"│4 │
├───────┼──────────┤
│"room4"│4 │
└───────┴──────────┘