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https://issues.apache.org/jira/browse/S2GRAPH-216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daewon Jeong reassigned S2GRAPH-216:
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Assignee: Daewon Jeong
> Provide a transform directive in the GraphQL query result.
> ----------------------------------------------------------
>
> Key: S2GRAPH-216
> URL: https://issues.apache.org/jira/browse/S2GRAPH-216
> Project: S2Graph
> Issue Type: Improvement
> Components: s2graphql
> Reporter: Daewon Jeong
> Assignee: Daewon Jeong
> Priority: Minor
>
> 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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