dgraph-101

dgraph with modus 101

From ModusHack livestream - 11/19/24 .

Dgraph

Start a local instance using Docker.

   docker run --name dgraph-101 -d -p "8080:8080" -p "9080:9080" -v ~/dgraph-101:/dgraph dgraph/standalone:latest

Start Ratel, a Graphical data explorer for Dgraph:

docker run --name ratel  -d -p "8000:8000"  dgraph/ratel:latest

Data model

Modus is code first, simply define you data using classes. In this example we are using Product and Category defined in classes.ts file.

Define your API

index.ts is where we export the functions that are exposed as GraphQL operations.

This project defines the following operations:

• upsertProduct
• getProduct
• deleteProduct

Note that Modus is exposing getProduct as product to follow common coding and GraphQL practices. Modus also exposes upsertProduct and deleteProduct as a GraphQL Mutation automatically.

• getProductsByCategory The data is saved in Dgraph as a graph. This function shows how to easily use the relationships in the graph.

• searchProducts Finally we are using an AI model to create text embeddings for our Products: as the embeddings are stored in Dgraph for each Product entity, we can easily expose an API to search by natural language and similarity, leveraging DQL similar_to function.