Write and run refactor code to: Find an actor that acted in a Movie (MATCH (a:Actor)-[r:ACTED_IN]-(m:Movie)) Create (using MERGE) a Role node setting it’s name to the role in the ACTED_IN relationship. Create (using MERGE) the PLAYED relationship betw

General Graph Academy
1

my code which is not working
MATCH (a:Actor)-[r:ACTED_IN]-(m:Movie)
MERGE (x:Role {name: "r.role"})
MERGE (a)-[:PLAYED]->(x)
MERGE (x)-[:IN_MOVIE]->(m)
SET r.role = null

1 Like
2

Hello @harsimran_kaur1 :slight_smile:

MATCH (a:Actor)-[r:ACTED_IN]->(m:Movie)
MERGE (x:Role {name: r.role})
MERGE (a)-[:PLAYED]->(x)
MERGE (x)-[:IN_MOVIE]->(m)
SET r.role = null

Regards,
Cobra

3

i tried the same code but it is not working

4

What's not working? The request or your answer is not validated?

5

When i run this code, and click the check database it is not validating

6

I'm not sure if you have to delete the ACTED_IN relationships after executing the query. You should check what is in the database to see if it respects the model.

7

@harsimran_kaur1 ,

The code that @cobra showed is correct. My guess is that the "starting" nodes/relationships in your graph do not reflect what you should have at the beginning of the Challenge. I suggest that you sign out of the course and then sign in and go back to that Challenge. With the sandbox embedded in the course, it should reset the graph to where you should be at the beginning of the Challenge.

Elaine

1 Like
8

i tried again as u instructed it gives me error as
Cannot merge the following node because of null property value for 'name': (:Role {name: null})

9

Hello @harsimran_kaur1

I suggest that you remove all nodes and relationships from the graph:

MATCH (n) DETACH DELETE n

Then run this Cypher to put the graph in the state it should be in before you attempt the Challenge:

MERGE (apollo:Movie {title: 'Apollo 13', tmdbId: 568, released: '1995-06-30', imdbRating: 7.6})
MERGE (tom:Person {name: 'Tom Hanks', tmdbId: 31, born: '1956-07-09'})
MERGE (meg:Person {name: 'Meg Ryan', tmdbId: 5344, born: '1961-11-19'})
MERGE (danny:Person {name: 'Danny DeVito', tmdbId: 518, born: '1944-11-17'})
MERGE (sleep:Movie {title: 'Sleepless in Seattle', tmdbId: 858, released: '1993-06-25', imdbRating: 6.8})
MERGE (hoffa:Movie {title: 'Hoffa', tmdbId: 10410, released: '1992-12-25', imdbRating: 6.6})
MERGE (jack:Person {name: 'Jack Nicholson', tmdbId: 514, born: '1937-04-22'})
MERGE (sandy:User {name: 'Sandy Jones', userId: 534})
MERGE (clinton:User {name: 'Clinton Spencer', userId: 105})
MERGE (tom)-[:ACTED_IN {role: 'Jim Lovell'}]->(apollo)
MERGE (tom)-[:ACTED_IN {role: 'Sam Baldwin'}]->(sleep)
MERGE (meg)-[:ACTED_IN {role: 'Annie Reed'}]->(sleep)
MERGE (danny)-[:ACTED_IN {role: 'Bobby Ciaro'}]->(hoffa)
MERGE (danny)-[:DIRECTED]->(hoffa)
MERGE (jack)-[:ACTED_IN {role: 'Jimmy Hoffa'}]->(hoffa)
MERGE (sandy)-[:RATED {rating:5}]->(apollo)
MERGE (sandy)-[:RATED {rating:4}]->(sleep)
MERGE (clinton)-[:RATED {rating:3}]->(apollo)
MERGE (clinton)-[:RATED {rating:3}]->(sleep)
MERGE (clinton )-[:RATED {rating:3}]->(hoffa)
MERGE (casino:Movie {title: 'Casino', tmdbId: 524, released: '1995-11-22', imdbRating: 8.2})
MERGE (martin:Person {name: 'Martin Scorsese', tmdbId: 1032})
MERGE (martin)-[:DIRECTED]->(casino)
SET tom:Actor
SET meg:Actor
SET danny:Actor
SET jack:Actor
SET danny:Director
SET martin:Director
MERGE (english:Language {name: 'English'})
MERGE (italian:Language {name: 'Italian'})
MERGE (latin:Language {name: 'Latin'})
MERGE (apollo)-[:IN_LANGUAGE]->(english)
MERGE (sleep)-[:IN_LANGUAGE]->(english)
MERGE (hoffa)-[:IN_LANGUAGE]->(english)
MERGE (casino)-[:IN_LANGUAGE]->(english)
MERGE (apollo)-[:IN_LANGUAGE]->(english)
MERGE (hoffa)-[:IN_LANGUAGE]->(italian)
MERGE (hoffa)-[:IN_LANGUAGE]->(latin)
MERGE (comedy:Genre {name: 'Comedy'})
MERGE (drama:Genre {name: 'Drama'})
MERGE (romance:Genre {name: 'Romance'})
MERGE (adventure:Genre {name: 'Adventure'})
MERGE (imax:Genre {name: 'IMAX'})
MERGE (crime:Genre {name: 'Crime'})
MERGE (apollo)-[:IN_GENRE]->(drama)
MERGE (apollo)-[:IN_GENRE]->(adventure)
MERGE (apollo)-[:IN_GENRE]->(imax)
MERGE (sleep)-[:IN_GENRE]->(drama)
MERGE (sleep)-[:IN_GENRE]->(comedy)
MERGE (sleep)-[:IN_GENRE]->(romance)
MERGE (hoffa)-[:IN_GENRE]->(drama)
MERGE (hoffa)-[:IN_GENRE]->(crime)
MERGE (casino)-[:IN_GENRE]->(drama)
MERGE (casino)-[:IN_GENRE]->(crime)
MERGE (jack)-[:ACTED_IN_1992]->(hoffa)
MERGE (danny)-[:ACTED_IN_1992]->(hoffa)
MERGE (danny)-[:DIRECTED_1992]->(hoffa)
MERGE (tom)-[:ACTED_IN_1993]->(sleep)
MERGE (meg)-[:ACTED_IN_1993]->(sleep)
MERGE (tom)-[:ACTED_IN_1995]->(apollo)
MERGE (martin)-[:DIRECTED_1995]->(casino)
MERGE (clinton)-[:RATED_3]->(apollo)
MERGE (clinton)-[:RATED_3]->(hoffa)
MERGE (clinton)-[:RATED_3]->(sleep)
MERGE (sandy)-[:RATED_4]->(sleep)
MERGE (sandy)-[:RATED_5]->(apollo)

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Thanks it worked for me