cufyorg / graphkt Goto Github PK

interface LazyEvaluatedValue<T>

data class DatabaseGetOperation<T>(
    val collectionName: String,
    val filter: DatabaseFilter,  // made up class name
    val field: String
) :  LazyEvaluatedValue<T>

data class DatabaseSetOperation<T>(
   val collectionName: String,
   val filter: DatabaseFilter, // made up class name
   val field: String,
   val value: DatabaseValue // made up class name
) : LazyEvaluatedValue<T>

graphql {
    engine {
        lazyValueEvaluator<DatabaseGetOperation> { values: List<DatabaseGetOperation> ->
              databaseClient.performOperations(values) // made up function name
        }
        lazyValueEvaluator<DatabaseSetOperation> { values: List<DatabaseSetOperation> ->
              databaseClient.performOperations(values) // made up function name
        }
    }
}

field("getMyField") {
    //...

    getLazyEvaluatedValue {
        DatabaseGetOperation(
           collectionName ="myCollection",
           filter = DatabaseFilter("id=${instance.id}"),
           field = "myField"
        )       
    }
}
field("setMyField") {
   val arg = argument { /*...*/ }

   getLazyEvaluatedValue {
        val argValue = arg()

      DatabaseSetOperation(
          collectionName = "myCollection",
           filter = DatabaseFilter("id=${instance.id}"),
           field = "myField",
           value = DatabaseValue(argValue)
      )
   }
}