Adding GraphQLResult conversion extension (apollographql/apollo-ios-d…

…ev#139)

Sources/Apollo/GraphQLError.swift

@@ -86,3 +86,14 @@ extension GraphQLError: LocalizedError {
     return self.description
   }
 }
+
+extension GraphQLError {
+  func asJSONDictionary() -> [String: Any] {
+    var dict: [String: Any] = [:]
+    if let message = self["message"] { dict["message"] = message }
+    if let locations = self["locations"] { dict["locations"] = locations }
+    if let path = self["path"] { dict["path"] = path }
+    if let extensions = self["extensions"] { dict["extensions"] = extensions }
+    return dict
+  }
+}

Sources/Apollo/GraphQLResult.swift

@@ -47,3 +47,32 @@ extension GraphQLResult: Equatable where Data: Equatable {
 }
 
 extension GraphQLResult: Hashable where Data: Hashable {}
+
+extension GraphQLResult {
+
+  /// Converts a ``GraphQLResult`` into a basic JSON dictionary for use.
+  ///
+  /// - Returns: A `[String: Any]` JSON dictionary representing the ``GraphQLResult``.
+  public func asJSONDictionary() -> [String: Any] {
+    var dict: [String: Any] = [:]
+    if let data { dict["data"] = convert(value: data.__data) }
+    if let errors { dict["errors"] = errors.map { $0.asJSONDictionary() } }
+    if let extensions { dict["extensions"] = extensions }
+    return dict
+  }
+
+  private func convert(value: Any) -> Any {
+      var val: Any = value
+      if let value = value as? ApolloAPI.DataDict {
+          val = value._data
+      } else if let value = value as? CustomScalarType {
+          val = value._jsonValue
+      }
+      if let dict = val as? [String: Any] {
+          return dict.mapValues(convert)
+      } else if let arr = val as? [Any] {
+          return arr.map(convert)
+      }
+      return val
+  }
+}