Grakn with Node.js: Match query - example #1

phone_calls_query_1.js

const Grakn = require("grakn");
const grakn = new Grakn("localhost:48555");
const session = grakn.session("phone_calls");

ExecuteMatchQuery();

async function ExecuteMatchQuery() {
  const tx = await session.transaction(Grakn.txType.READ);

  let query = [
    "match",
    "  $customer isa person has phone-number $phone-number;",
    '  $company isa company has name "Telecom";',
    "  (customer: $customer, provider: $company) isa contract;",
    '  $target isa person has phone-number "+86 921 547 9004";',
    "  (caller: $customer, callee: $target) isa call has started-at $started-at;",
    "  $min-date == 2018-09-14T17:18:49; $started-at > $min-date;",
    "get $phone-number;"
  ];

  console.log("\nQuery:\n", query.join("\n"));
  query = query.join("");

  const iterator = await tx.query(query);
  const answers = await iterator.collect();
  const result = await Promise.all(
    answers.map(answer =>
      answer
        .map()
        .get("phone-number")
        .value()
    )
  );
  
  console.log("\nResult:\n", result);
  
  await session.close();
  process.exit();
}