Please use * with delete operation for non-list type: [_predicate_]

Issues Dgraph Clients
,
1

Moved from GitHub dgraph-js/34

Posted by lazharichir:

Hello - quick question!

mu.setDeleteJson([ { 'topic.external.wikidata': null, uid: '0x9c671a' } ]);

Returns:

2 UNKNOWN: Please use * with delete operation for non-list type: [_predicate_]

The predicate topic.external.wikidata is a int, non-list.

Anything I am missing? I want to delete the predicate topic.external.wikidata for the uid specified.

2

gpahal commented :

It’s working with this example.

const dgraph = require("dgraph-js");

async function main() {
    const clientStub = new dgraph.DgraphClientStub("localhost:9080");
    const client = new dgraph.DgraphClient(clientStub);

    console.log("DROP ALL");
    let op = new dgraph.Operation();
    op.setDropAll(true);
    await client.alter(op);

    console.log("SET SCHEMA");
    const schema = `
        name: string @index(term) .
        topic.external.wikidata: int .
    `;
    op = new dgraph.Operation();
    op.setSchema(schema);
    await client.alter(op);

    console.log("CREATE DATA");
    let txn = client.newTxn();
    let uid;
    try {
        const mu = new dgraph.Mutation();
        mu.setSetNquads(`
            <_:a> <name> "a" .
            <_:a> <topic.external.wikidata> "1" .
            <_:b> <name> "b" .
            <_:b> <topic.external.wikidata> "2" .
        `);
        const assigned = await txn.mutate(mu);
        await txn.commit();
        uid = assigned.getUidsMap().get("b")
    } finally {
        await txn.discard();
    }

    console.log("QUERY DATA");
    let query = `{
        all(func: has(name)) {
            uid
            name
            topic.external.wikidata
        }
    }`;
    let res = await client.newTxn().query(query);
    let ppl = res.getJson();
    console.log(`BEFORE:\nNumber of people: ${ppl.all.length}`);
    console.log(`People: ${JSON.stringify(ppl)}\n`);

    console.log("DELETE DATA");
    txn = client.newTxn();
    try {
        const mu = new dgraph.Mutation();
        mu.setDeleteJson([{ uid: uid, "topic.external.wikidata": null }]);
        await txn.mutate(mu);
        await txn.commit();
    } finally {
        await txn.discard();
    }

    console.log("QUERY DATA");
    query = `{
        all(func: has(name)) {
            uid
            name
            topic.external.wikidata
        }
    }`;
    res = await client.newTxn().query(query);
    ppl = res.getJson();
    console.log(`AFTER:\nNumber of people: ${ppl.all.length}`);
    console.log(`People: ${JSON.stringify(ppl)}`);

    clientStub.close();
}

main().then(() => {
    console.log("DONE!");
}).catch((e) => {
    console.log("ERROR: ", e);
});
3

gpahal commented :

Can you share a bit more of your code because the error seems to indicate predicate name _predicate_