fixes

src/components/ChartView.vue

@@ -1,7 +1,8 @@
 <script>
 import { Line, mixins } from 'vue-chartjs';
 
-function resolve_data (set, keys) {
+function resolve_data (set, index) {
+  const keys = typeof index === 'string' ? index.split ('/') : index;
   const data = set[keys[0]];
   if (keys.length === 1)
     return data;
@@ -27,7 +28,7 @@ export default {
   },
   computed: {
     chart_data () {
-      const labels = this.data.map ((d) => d[this.xaxis]);
+      const labels = this.data.map ((d) => resolve_data (d, this.xaxis));
       const datasets = this.yaxis.map ((y, index) => {
         const res = {
           label:           y.label,
@@ -37,7 +38,7 @@ export default {
           backgroundColor: y.fill
         };
         for (const data of this.data)
-          res.data.push (resolve_data (data, y.field.split ('/')));
+          res.data.push (resolve_data (data, y.field));
         return res;
       });
       return { datasets, labels };