[jira] [Created] (S2GRAPH-216) Provide a transform directive in the GraphQL return field.

[Daewon Jeong (JIRA)]

Daewon Jeong created S2GRAPH-216:
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             Summary: Provide a transform directive in the GraphQL return field.
                 Key: S2GRAPH-216
                 URL: https://issues.apache.org/jira/browse/S2GRAPH-216
             Project: S2Graph
          Issue Type: Improvement
          Components: s2graphql
            Reporter: Daewon Jeong


h2. Provides a way to manipulate the String if the value of the returned field 
is String.

You may want to simply change the result value of the field returned by the 
query's result value. In the case of SQL, the return field can be prefixed with 
the string 'prefix'.
{noformat}
  select concat ('prefix_', label) as with_prefix from labels limit 2
{noformat}
 

I would like to implement the 'Directive' function provided by the GraphQL Spec 
as follows.

The script language used for the @transform directive is to use scala, which 
can be changed to a language that conforms to Javascript or other JVM 
ScriptEngine (JSR-223) specifications.
{noformat}
{
  s2graph {
    user_id_test(id: 0) {
      s2graph_label_test_2(limit: 1) {
        item_id_test {
          id
          transformedId: id @transform(func: " (s: String) => 
s\"img_${s}_${s.toInt * 10}.jpg\" ")
          timestamp
        }
      }
    }
  }
}
{noformat}
 

The result of the above query will be as follows.
 You can see that the value of the 'transformedId' field has changed.
{noformat}
{
  "data": {
    "s2graph": {
      "user_id_test": [
        {
          "s2graph_label_test_2": [
            {
              "item_id_test": {
                "id": "1",
                "transformedId": "img_1_10.jpg",
                "timestamp": 1527663919876
              }
            }
          ]
        }
      ]
    }
  }
}
{noformat}



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