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Update Cypher syntax for PeopleService, tweak readme #2

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May 21, 2025
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Update Cypher syntax for PeopleService, tweak readme #2

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11 changes: 8 additions & 3 deletions README.adoc
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Expand Up @@ -4,7 +4,7 @@

This repository accompanies the link:https://graphacademy.neo4j.com/courses/app-java/[Building Neo4j Applications with Java course^] on link:https://graphacademy.neo4j.com/[Neo4j GraphAcademy^].

For a complete walkthrough of this repository, link:https://graphacademy.neo4j.com/courses/app-java/[enroll now^].
For a complete walkthrough of this repository, link:https://graphacademy.neo4j.com/courses/app-java/[enroll now^].

== Setup

Expand All @@ -16,22 +16,27 @@ sdk install java 17-open
sdk use java 17-open
sdk install maven
mvn verify
mvn compile exec:java
----

.Connection details to your neo4j database are in `src/main/resources/application.properties`
[source,properties]
----
APP_PORT=3000

NEO4J_URI=bolt://hostname-or-ip:7687
NEO4J_URI=bolt://<hostname-or-ip>:7687
NEO4J_USERNAME=neo4j
NEO4J_PASSWORD=<password>

JWT_SECRET=secret
SALT_ROUNDS=10
----

.Run the application
[source,shell]
----
mvn compile exec:java
----

== A Note on comments

You may spot a number of comments in this repository that look a little like this:
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39 changes: 23 additions & 16 deletions src/main/java/neoflix/services/PeopleService.java
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Expand Up @@ -76,17 +76,20 @@ public Map<String, Object> findById(String id) {

// Get a person from the database
var person = session.executeRead(tx -> {
String query = """
MATCH (p:Person {tmdbId: $id})
RETURN p {
.*,
actedCount: count { (p)-[:ACTED_IN]->() },
directedCount: count { (p)-[:DIRECTED]->() }
} AS person
""";
var res = tx.run(query, Values.parameters("id", id));
return res.single().get("person").asMap();
});
String query = """
MATCH (p:Person {tmdbId: $id})
WITH p,
count { (p)-[:ACTED_IN]->() } AS actedCount,
count { (p)-[:DIRECTED]->() } AS directedCount
RETURN p {
.*,
actedCount: actedCount,
directedCount: directedCount
} AS person
""";
var res = tx.run(query, Values.parameters("id", id));
return res.single().get("person").asMap();
});
return person;
}
}
Expand All @@ -108,13 +111,17 @@ public List<Map<String,Object>> getSimilarPeople(String id, Params params) {
// Get a list of similar people to the person by their id
var res = session.executeRead(tx -> tx.run("""
MATCH (:Person {tmdbId: $id})-[:ACTED_IN|DIRECTED]->(m)<-[r:ACTED_IN|DIRECTED]-(p)
WITH p,
count { (p)-[:ACTED_IN]->() } AS actedCount,
count { (p)-[:DIRECTED]->() } AS directedCount,
collect(m {.tmdbId, .title, type: type(r)}) AS inCommon
RETURN p {
.*,
actedCount: count { (p)-[:ACTED_IN]->() },
directedCount: count { (p)-[:DIRECTED]->() },
inCommon: collect(m {.tmdbId, .title, type: type(r)})
.*,
actedCount: actedCount,
directedCount: directedCount,
inCommon: inCommon
} AS person
ORDER BY size(person.inCommon) DESC
ORDER BY size(inCommon) DESC
SKIP $skip
LIMIT $limit
""",Values.parameters("id",id, "skip", params.skip(), "limit", params.limit()))
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