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Dgraph DQL Tour

Schema

Reverse edges

Edges are directional. A query can’t traverse an edge in reverse.

There are two choices to query in both directions

  • Add the reverse edge to the schema and add all the reverse edge data.

  • Tell Dgraph to always store the reverse edge using the @reverse keyword in the schema.

Run the schema mutation and Dgraph will compute all the reverse edges. The reverse edge of an_edge is ~an_edge.

In terms of data modeling, some reverse edges always make sense, such as friend. Others, such as boss_of, are sometimes, but not always bidirectional.

Dgraph DQL Tour

An interactive tutorial with real queries and real results, designed to run on Chrome on your machine.

Modules

. GraphQL Introduction . GraphQL Basic Features . GraphQL Schema . GraphQL Search . GraphQL Data and More Data . DQL Introduction . DQL Basic Features . DQL Schema . DQL Data and More Data . DQL Query Blocks and Variables . DQL Search

DQL Schema

This module shows you how schemas work inside Dgraph; and how to add, update, and delete data.

Module Breakdown

3.1. Adding schema - mutating schema 3.2. Adding Data - mutating data 3.3. External Identifiers 3.4. Language Support 3.5. Reverse edges 3.6. Reverse edges Query 3.7. Exercise : Integrating existing data 3.8. Deleting Data 3.9. Expand Predicate 3.10. Congratulations
Endpoint: /alter
Dgraph: http://localhost:8080
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Response

3.5 Reverse edges