@Starter Neo4J Graph Typescript

To start developing clone repository

git clone https://github.com/rxdi/starter-neo4js-typescript

Install @gapi command line interface and typescript node

cd starter-neo4js-typescript && npm i

Download Neo4J database https://neo4j.com/download/

Follow the steps and create your Graph using interface provided and set password to it

default username for neo4j is neo4j

You only need to setup password field

import { CoreModule, Module } from "@gapi/core";
import { VoyagerModule } from "@gapi/voyager";
import { Neo4JModule } from "@rxdi/neo4j";
import { AppController } from "./app.controller";

@Module({
  controllers: [AppController],
  imports: [
    CoreModule.forRoot(),
    Neo4JModule.forRoot({
      password: "your-password",
      username: "neo4j",
      address: "bolt://localhost:7687"
    }),
    VoyagerModule.forRoot()
  ]
})
export class AppModule {}

App Controller

import { Controller, GraphQLList, Query, Type } from "@gapi/core";
import { graphRequest } from "@rxdi/neo4j";
import { Movie } from "./movie.type";
import { Genre } from "./genre.type";

@Controller()
export class AppController {
  @Type(new GraphQLList(Movie))
  @Query()
  Movie(root, params, ctx, resolveInfo) {
    return graphRequest(root, params, ctx, resolveInfo);
  }

  @Type(new GraphQLList(Genre))
  @Query()
  Genre(root, params, ctx, resolveInfo) {
    return graphRequest(root, params, ctx, resolveInfo);
  }
}

Movie Type

import {
  GraphQLObjectType,
  GraphQLString,
  GraphQLInt,
  GraphQLFloat,
  GraphQLList
} from "graphql";
import { Genre } from "./genre.type";

export const Movie = new GraphQLObjectType({
  name: "Movie",
  fields: () => ({
    title: {
      type: GraphQLString
    },
    year: {
      type: GraphQLInt
    },
    imdbRating: {
      type: GraphQLFloat
    },
    genres: {
      relation: {
        name: "IN_GANRE",
        direction: "OUT"
      },
      type: new GraphQLList(Genre)
    }
  })
});

Genre Type

import { GraphQLObjectType, GraphQLString, GraphQLList } from "graphql";
import { Movie } from "./movie.type";

export const Genre = new GraphQLObjectType({
  name: "Genre",
  fields: () => ({
    name: {
      type: GraphQLString
    },
    movies: {
      relation: {
        name: "IN_GANRE",
        direction: "IN"
      },
      type: new GraphQLList(Movie)
    }
  })
});

Start application

Wait for about 5 seconds and browser will be started leading you to Graphiql panel

npm start

Build application

Build is accomplished with ParcelJS internally inside @gapi/cli

npm run build

Clean build

npm run clean

Open voyager panel

http://0.0.0.0:9000/voyager

Open graphiql DevTools

http://0.0.0.0:9000/devtools

Example

1. Create Movie

mutation {
  CreateMovie(title: "Titanic", year: 1990, imdbRating: 1) {
    title
    year
    genres {
      name
    }
  }
}

2. Create Genre

mutation {
  CreateGenre(name: "Drama") {
    name
    movies {
      title
      year
      imdbRating
    }
  }
}

3. Create Relationship between Genre Drama and Movie Titanic

mutation {
  AddGenreMovies(from: { title: "Titanic" }, to: { name: "Drama" }) {
    from {
      title
    }
    to {
      name
    }
  }
}

4. List Genres

query {
  Genre {
    name
    movies {
      title
    }
  }
}

5. List Movies

query {
  Movie {
    title
    year
    genres {
      name
    }
  }
}

Notice that both objects are linked