Cypher query doesn't behave as expected with multiple match blocks? - neo4j

Question

I've got the following query:
MATCH (u:User) WHERE u.username = "ben"
OPTIONAL MATCH (u)-[:HAS]->(pl)
//MATCH (u)-[r1:IS_AT|PREFERS|DESIRES|VALUES]->()<-[]-(fp:FitnessProgram) WHERE NOT (fp)-[:LIMITED_BY]-(pl)
//WITH u, pl, fp, coalesce(r1.importance, 0.5) AS importance
//WITH u, pl, fp, collect({name: fp.name, importance: importance}) AS fpTraits
//WITH u, pl, reduce(s = 0, t IN fpTraits | s + t.importance) AS fpScore order by fpScore
MATCH (u)-[r2:IS_AT|PREFERS|DESIRES|VALUES]->()<-[]-(ns:NutritionalSupplement) WHERE NOT (ns)-[:LIMITED_BY]-(pl)
WITH u, ns, coalesce(r2.importance, 0.5) AS importance
WITH u, ns, collect({name: ns.name, importance: importance}) AS nsTraits
WITH u, ns, reduce(s = 0, t IN nsTraits | s + t.importance) AS nsScore order by nsScore desc limit 5
return u, ns.name, nsScore
As it is, with the 4 lines commented out, it works correctly and gives me the top 5 nutritional supplements as expected.
If I commented out the bottom block and uncomment the top block, that one works as expected too.
If I have both uncommented like below, neither block works and I get a bunch of dupes and the scores are all crazy... seems like the two matches get combined in some way I'm not understanding yet (I'm new to Neo4j)?
MATCH (u:User) WHERE u.username = "ben"
OPTIONAL MATCH (u)-[:HAS]->(pl)
MATCH (u)-[r1:IS_AT|PREFERS|DESIRES|VALUES]->()<-[]-(fp:FitnessProgram) WHERE NOT (fp)-[:LIMITED_BY]-(pl)
WITH u, pl, fp, coalesce(r1.importance, 0.5) AS importance
WITH u, pl, fp, collect({name: fp.name, importance: importance}) AS fpTraits
WITH u, pl, fp, reduce(s = 0, t IN fpTraits | s + t.importance) AS fpScore order by fpScore desc limit 5
MATCH (u)-[r2:IS_AT|PREFERS|DESIRES|VALUES]->()<-[]-(ns:NutritionalSupplement) WHERE NOT (ns)-[:LIMITED_BY]-(pl)
WITH u, fp, fpScore, ns, coalesce(r2.importance, 0.5) AS importance
WITH u, fp, fpScore, ns, collect({name: ns.name, importance: importance}) AS nsTraits
WITH u, fp, fpScore, ns, reduce(s = 0, t IN nsTraits | s + t.importance) AS nsScore order by nsScore desc limit 5
return u, fp.name, fpScore, ns.name, nsScore

Answer 1

What values of fp do you expect to have in the last block? It's not a part of the last query, so I don't think it can be in your WITH statements
You do not need to keep declaring fp in your WITH statements:
MATCH (u)-[r2:IS_AT|PREFERS|DESIRES|VALUES]->()<-[]-(ns:NutritionalSupplement)
WHERE NOT (ns)-[:LIMITED_BY]-(pl)
WITH u, ns, coalesce(r2.importance, 0.5) AS importance
WITH u, ns, collect({name: ns.name, importance: importance}) AS nsTraits
WITH u ns, reduce(s = 0, t IN nsTraits | s + t.importance) AS nsScore order by nsScore desc limit 5
return u, fp.name, fpScore, ns.name, nsScore