Creating a Driver Instance

Your challenge is to add a new Driver instance to an existing file with the connection details provided. Once you have created the Driver, you must open a new session and run a Cypher statement to find the director of Toy Story.

Open Challenge in an Online IDE →

Steps

Install the Neo4j JavaScript Driver in the integrated terminal window
sh
Installing the neo4j-driver dependency
```
npm install neo4j-driver
```
Use the neo4j object to create a new instance of the Driver with the credentials provided:
- NEO4J_URI is the connection string
- NEO4J_USERNAME and NEO4J_PASSWORD should be used to create the authentication token.
Once you have created the Driver, open a new session and run the following query:
cypher
Find the Director
```
MATCH (p:Person)-[:DIRECTED]->(:Movie {title: "Toy Story"})
RETURN p.name AS Director
```
The statement requires the following parameters:
typescript
```
{ title: 'Toy Story' }
```
To find the answer, click the Debug icon to the left of the window and run Create Driver Challenge task, or use the integrated terminal window to run the following command:
sh
Run The Challenge
```
ts-node src/challenges/create-driver/challenge.ts
```
Once you have the result, copy and paste it into the text box below and click Check Answer.

View the Solution

// tag::import[]
// Import the driver
import neo4j, { Integer, Node, Relationship } from 'neo4j-driver'
import { getNeo4jCredentials } from '../utils'
// end::import[]

// tag::credentials[]
// Neo4j Credentials
const {
  NEO4J_URI,
  NEO4J_USERNAME,
  NEO4J_PASSWORD
} = getNeo4jCredentials()
// end::credentials[]

async function main() {
  // tag::solution[]
  // Create a Driver Instance using neo4j.driver()
  const driver = neo4j.driver(
    NEO4J_URI,
    neo4j.auth.basic(NEO4J_USERNAME, NEO4J_PASSWORD)
  )

  // Open a new Session using driver.session()
  const session = driver.session()

  try {
    // Run this Cypher statement using session.run()
    const cypher = `
      MATCH (p:Person)-[:DIRECTED]->(:Movie {title: $title})
      RETURN p.name AS Director
    `
    const params = { title: 'Toy Story' }

    const res = await session.run(cypher, params)

    // Log the Director value of the first record
    console.log(res.records[0].get('Director'))
  }
  finally {
    await session.close()
  }
  // end::solution[]
}

main()

Your Answer

Who directed Toy Story?

Take the Director value output from the statement above and paste it into the box below.

✓ John Lasseter

Hint

You need to call the neo4j.driver() object to create a Driver instance using the NEO4J_URI, NEO4J_USERNAME and NEO4J_PASSWORD variables, then open a new session, execute the Cypher statement and log the Director value of the first record.

Your console.log() statement should look similar to the code block below:

console.log(res.records[0].get('Director'))

Copy the answer without any quotes or whitespace.

Solution

John Lasseter directed Toy Story.

Compare your code with the solution here

// tag::import[]
// Import the driver
import neo4j, { Integer, Node, Relationship } from 'neo4j-driver'
import { getNeo4jCredentials } from '../utils'
// end::import[]

// tag::credentials[]
// Neo4j Credentials
const {
  NEO4J_URI,
  NEO4J_USERNAME,
  NEO4J_PASSWORD
} = getNeo4jCredentials()
// end::credentials[]

async function main() {
  // tag::solution[]
  // Create a Driver Instance using neo4j.driver()
  const driver = neo4j.driver(
    NEO4J_URI,
    neo4j.auth.basic(NEO4J_USERNAME, NEO4J_PASSWORD)
  )

  // Open a new Session using driver.session()
  const session = driver.session()

  try {
    // Run this Cypher statement using session.run()
    const cypher = `
      MATCH (p:Person)-[:DIRECTED]->(:Movie {title: $title})
      RETURN p.name AS Director
    `
    const params = { title: 'Toy Story' }

    const res = await session.run(cypher, params)

    // Log the Director value of the first record
    console.log(res.records[0].get('Director'))
  }
  finally {
    await session.close()
  }
  // end::solution[]
}

main()

Click here to view the solution.

Lesson Summary

In this challenge, you used your knowledge to create a driver instance and run a Cypher statement.

In the next lesson, you will learn about the different transaction functions and when to use them.

Building Neo4j Applications with TypeScript

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