使用 nodejs 从 Neo4j 获取数据

Question

I am using Neo4j for the first time with nodejs. I am trying a particular usecase which is " User can search a movie, for eg: Titanic, for recommendation of other similar movies the result must contain movies of the same genre, movies from the same director. " When i search for a movie, i am able to get the related nodes like actor, director and genre of the movie. what i want next are the other movies related to this director and genre.

Here 'title' is the name of the movie i am passing in REST API Get method.

session.run("MATCH (n:movie{name : $title}) -[:Acted_In|:Directed |: Belong_To]-(r) Return r ",
                        { title: req.params.name }

                        )

        .then(function (data) {

            data.records.forEach(function(record){
            console.log("record._fields[0].properties = ",record._fields[0].properties.name);
            result.push(record._fields[0].properties.name);  
              })
                 console.log(result);

          })
                        ```

Answer 1

This Cypher query should work for your use case ( "User can search a movie, for eg: Titanic, for recommendation of other similar movies the result must contain movies of the same genre, movies from the same director." ):

MATCH (m:movie)
WHERE m.name = $title
MATCH (m)-[:Belong_To]->()<-[:Belong_To]-(x)
WITH m, COLLECT(x) AS xs
MATCH (m)<-[:Directed]-()-[:Directed]->(y)
WITH m, xs, COLLECT(y) AS ys
UNWIND (xs + ys) AS otherMovie
RETURN m, COLLECT(DISTINCT otherMovie) AS recommendations

I assume the Belong_To relationship points to a genre. I also assume all movies have at least one genre and one director; if that is not true, then the relevant MATCH should be an OPTIONAL MATCH .

This query uses the aggregating function COLLECT to separately collect the movies having the same genres ( xs ), and the same directors ( ys ). It then UNWIND s the combination of xs and ys so that it can use COLLECT(DISTINCT...) to get a list of distinct movies.