1 files changed, 9 insertions, 18 deletions
diff --git a/src/client/northstar/dash-fields/HistogramField.ts b/src/client/northstar/dash-fields/HistogramField.ts
index 90be70b80..c699691a4 100644
--- a/src/client/northstar/dash-fields/HistogramField.ts
+++ b/src/client/northstar/dash-fields/HistogramField.ts
@@ -6,6 +6,7 @@ import { BasicField } from "../../../fields/BasicField";
 import { Field, FieldId } from "../../../fields/Field";
 import { CurrentUserUtils } from "../../../server/authentication/models/current_user_utils";
 import { Types } from "../../../server/Message";
+import { OmitKeys } from "../../../Utils";
 
 
 export class HistogramField extends BasicField<HistogramOperation> {
@@ -13,21 +14,12 @@ export class HistogramField extends BasicField<HistogramOperation> {
         super(data ? data : HistogramOperation.Empty, save, id);
     }
 
-    omitKeys(obj: any, keys: any) {
-        var dup: any = {};
-        for (var key in obj) {
-            if (keys.indexOf(key) == -1) {
-                dup[key] = obj[key];
-            }
-        }
-        return dup;
-    }
     toString(): string {
-        return JSON.stringify(this.omitKeys(this.Data, ['Links', 'BrushLinks', 'Result', 'BrushColors', 'FilterModels', 'FilterOperand']));
+        return JSON.stringify(OmitKeys(this.Data, ['Links', 'BrushLinks', 'Result', 'BrushColors', 'FilterModels', 'FilterOperand']));
     }
 
     Copy(): Field {
-        return new HistogramField(this.Data);
+        return new HistogramField(this.Data.Copy());
     }
 
     ToScriptString(): string {
@@ -35,13 +27,12 @@ export class HistogramField extends BasicField<HistogramOperation> {
     }
 
 
-    ToJson(): { type: Types, data: string, _id: string } {
+    ToJson() {
         return {
             type: Types.HistogramOp,
-
             data: this.toString(),
-            _id: this.Id
-        }
+            id: this.Id
+        };
     }
 
     @action
@@ -54,13 +45,13 @@ export class HistogramField extends BasicField<HistogramOperation> {
         let schema = CurrentUserUtils.GetNorthstarSchema(jp.SchemaName);
         if (schema) {
             CurrentUserUtils.GetAllNorthstarColumnAttributes(schema).map(attr => {
-                if (attr.displayName == jp.X.AttributeModel.Attribute.DisplayName) {
+                if (attr.displayName === jp.X.AttributeModel.Attribute.DisplayName) {
                     X = new AttributeTransformationModel(new ColumnAttributeModel(attr), jp.X.AggregateFunction);
                 }
-                if (attr.displayName == jp.Y.AttributeModel.Attribute.DisplayName) {
+                if (attr.displayName === jp.Y.AttributeModel.Attribute.DisplayName) {
                     Y = new AttributeTransformationModel(new ColumnAttributeModel(attr), jp.Y.AggregateFunction);
                 }
-                if (attr.displayName == jp.V.AttributeModel.Attribute.DisplayName) {
+                if (attr.displayName === jp.V.AttributeModel.Attribute.DisplayName) {
                     V = new AttributeTransformationModel(new ColumnAttributeModel(attr), jp.V.AggregateFunction);
                 }
             });