Edges are not being generated

Issues GraphQL
1

Report a GraphQL Bug

I have a scenario where I need to update the existing schema(containing 2 types Type1 & Type2) with relationships/edges after few 100’s of records are already been inserted into those respective types. Edges represent a relationship where Type1.predicate1 = Type2.predicate2. I am unable to create such relationship which automatically created the edges for the respective nodes.

Detailed Explanation:

Phase-0 (at time t=0):
schema

# Define Directives and index

initial_release_date: dateTime @index(year) .
name: string @index(exact, term) @lang .
type: [uid] .

# Define Types

type Person {
    name
}

type Movie {
    name
    initial_release_date
}

Phase-1 (at time t=X seconds):
– Now few 100’s of records are stored in the db already. And we updated the schema with few relationships.

new schema

# Define Directives and index

director.film: [uid] @reverse .
actor.film: [uid] @count .
initial_release_date: dateTime @index(year) .
name: string @index(exact, term) @lang .
starring: [uid] .
type: [uid] .

# Define Types

type Person {
    name
    director.film
    actor.film
}

type Movie {
    name
    initial_release_date
    starring
}

But here the edges are not updated automatically as there is not way to mention the base condition for the relationship. And for the new records/nodes added in both the types, we have to manually add the edge in mutation request.

What edition and version of Dgraph are you using?

Edition:

  • community edition

If you are using the community edition or enterprise edition of Dgraph, please list the version:

Dgraph Version 
v23.0.0

Have you tried reproducing the issue with the latest release?

Yes, I am able to reproduce the same.

Steps to reproduce the issue (paste the query/schema if possible)

Step-1:
Add the below schema

# Define Directives and index

initial_release_date: dateTime @index(year) .
name: string @index(exact, term) @lang .
type: [uid] .

# Define Types

type Person {
    name
}

type Movie {
    name
    initial_release_date
}

Step-2:
Now add few mutations and update with new schema

# Define Directives and index

director.film: [uid] @reverse .
actor.film: [uid] @count .
initial_release_date: dateTime @index(year) .
name: string @index(exact, term) @lang .
starring: [uid] .
type: [uid] .

# Define Types

type Person {
    name
    director.film
    actor.film
}

type Movie {
    name
    initial_release_date
    starring
}

Expected behaviour and actual result.

Expected:
The edges to be created automatically with an option to specify the base condition

Actual:
No edge is being formed directly.

2

Dgraph does not create anything automatically through DQL. It appears that you have posted this issue under the GraphQL category. I suspect you may be confusing DQL with GraphQL. DQL doesn’t create edges, values or anything else automatically.

On the other hand, GraphQL does create a CRUD (Create, Read, Update, Delete) system that is capable of doing this based on the structure of the data. However, the same functionality doesn’t apply to DQL.

For your use case, you might need to manually establish these relationships in DQL, or consider using GraphQL if automatic relationship creation is a requirement for your application.

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