"wrong use of var()" error when query variable is empty

Users
2

Are you sure that you using this query?

{
  parents(func: has(isParent)) {
    uid
    name
    items {
      itemAmount as amount
    }
    total: sum(val(itemAmount))
  }
}

For me is working:

{
  "extensions": {
    "server_latency": {
      "parsing_ns": 30061,
      "processing_ns": 2596369,
      "encoding_ns": 881382
    },
    "txn": {
      "start_ts": 16578
    }
  },
  "data": {
    "parents": [
      {
        "uid": "0x3f7d",
        "name": "third"
      },
      {
        "uid": "0x3f7e",
        "name": "first",
        "items": [
          {
            "amount": 10
          },
          {
            "amount": 2
          }
        ],
        "total": 12
      },
      {
        "uid": "0x3f81",
        "name": "second",
        "items": [
          {
            "amount": 5
          },
          {
            "amount": 3
          }
        ],
        "total": 8
      },
      {
        "uid": "0x3f84",
        "name": "first",
        "items": [
          {
            "amount": 0
          }
        ],
        "total": 0
      },
      {
        "uid": "0x3f86",
        "name": "first"
      }
    ]
  }
}

I’ve also did a test with:

{
	"set": [
    {
      "uid": "_:first",
      "isParent": true,
      "name": "first",
      "items": [
      	{ "amount": 0 }
      ]
    }
  ]
}

Some func or indexes need at least a value. Like “0”.

Tested in:


Dgraph version   : v1.0.12
Commit SHA-1     : 60d9ef0a
Commit timestamp : 2019-03-05 17:59:30 -0800
Branch           : HEAD
Go version       : go1.11.5
1 Like