fix(VDataTable): set initial values for sort-desc and group-desc

packages/vuetify/src/components/VData/VData.ts

@@ -1,5 +1,5 @@
 // Helpers
-import { wrapInArray, sortItems, deepEqual, groupItems, searchItems } from '../../util/helpers'
+import { wrapInArray, sortItems, deepEqual, groupItems, searchItems, fillArray } from '../../util/helpers'
 import Vue, { VNode } from 'vue'
 
 // Types
@@ -96,6 +96,18 @@ export default Vue.extend({
       internalOptions = Object.assign(internalOptions, this.options)
     }
 
+    const { sortBy, sortDesc, groupBy, groupDesc } = internalOptions
+    const sortDiff = sortBy.length - sortDesc.length
+    const groupDiff = groupBy.length - groupDesc.length
+
+    if (sortDiff > 0) {
+      internalOptions.sortDesc.push(...fillArray(sortDiff, false))
+    }
+
+    if (groupDiff > 0) {
+      internalOptions.groupDesc.push(...fillArray(groupDiff, false))
+    }
+
     return {
       internalOptions,
     }

packages/vuetify/src/components/VDataTable/__tests__/__snapshots__/VDataTable.spec.ts.snap

@@ -4605,16 +4605,16 @@ exports[`VDataTable.ts should render with group scoped slot 1`] = `
       </thead>
       <tbody>
         <div>
-          {"group":0,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[],"mustSort":false,"multiSort":false},"items":[{"name":"Jelly bean","calories":375,"fat":0,"carbs":94,"protein":0,"iron":"0%"},{"name":"Lollipop","calories":392,"fat":0.2,"carbs":98,"protein":0,"iron":"2%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
+          {"group":0,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[false],"mustSort":false,"multiSort":false},"items":[{"name":"Jelly bean","calories":375,"fat":0,"carbs":94,"protein":0,"iron":"0%"},{"name":"Lollipop","calories":392,"fat":0.2,"carbs":98,"protein":0,"iron":"2%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
         </div>
         <div>
-          {"group":3.9,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[],"mustSort":false,"multiSort":false},"items":[{"name":"Gingerbread","calories":356,"fat":16,"carbs":49,"protein":3.9,"iron":"16%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
+          {"group":3.9,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[false],"mustSort":false,"multiSort":false},"items":[{"name":"Gingerbread","calories":356,"fat":16,"carbs":49,"protein":3.9,"iron":"16%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
         </div>
         <div>
-          {"group":4,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[],"mustSort":false,"multiSort":false},"items":[{"name":"Frozen Yogurt","calories":159,"fat":6,"carbs":24,"protein":4,"iron":"1%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
+          {"group":4,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[false],"mustSort":false,"multiSort":false},"items":[{"name":"Frozen Yogurt","calories":159,"fat":6,"carbs":24,"protein":4,"iron":"1%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
         </div>
         <div>
-          {"group":4.3,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[],"mustSort":false,"multiSort":false},"items":[{"name":"Ice cream sandwich","calories":237,"fat":9,"carbs":37,"protein":4.3,"iron":"1%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
+          {"group":4.3,"options":{"page":1,"itemsPerPage":5,"sortBy":[],"sortDesc":[],"groupBy":["protein"],"groupDesc":[false],"mustSort":false,"multiSort":false},"items":[{"name":"Ice cream sandwich","calories":237,"fat":9,"carbs":37,"protein":4.3,"iron":"1%"}],"headers":[{"text":"Dessert (100g serving)","align":"left","sortable":false,"value":"name"},{"text":"Calories","value":"calories"},{"text":"Fat (g)","value":"fat"},{"text":"Carbs (g)","value":"carbs"},{"text":"Iron (%)","value":"iron"}]}
         </div>
       </tbody>
     </table>

packages/vuetify/src/util/helpers.ts

@@ -447,3 +447,7 @@ export function mergeDeep (
 
   return source
 }
+
+export function fillArray<T> (length: number, obj: T) {
+  return Array(length).fill(obj)
+}