Remove render loop caused by docsByDay

-> no more docsByDay state in component

aleksis/apps/alsijil/frontend/components/coursebook/Coursebook.vue

@@ -231,7 +231,7 @@ export default {
     },
     groupDocsByDay(docs) {
       // => {dt: [dt doc ...] ...}
-      this.docsByDay = docs.reduce((byDay, doc) => {
+      const docsByDay = docs.reduce((byDay, doc) => {
         // This works with dummy. Does actual doc have dateStart instead?
         const day = DateTime.fromISO(doc.datetimeStart).startOf("day");
         byDay[day] ??= [day];
@@ -239,9 +239,9 @@ export default {
         return byDay;
       }, {});
       // => [[dt doc ...] ...]
-      return Object.keys(this.docsByDay)
+      return Object.keys(docsByDay)
         .sort()
-        .map((key) => this.docsByDay[key]);
+        .map((key) => docsByDay[key]);
       // sorting is necessary since backend can send docs unordered
     },
     debounce(fn, delay) {
@@ -348,9 +348,10 @@ export default {
       if (!this.knownDates[date]) {
         console.log(this.lastQuery);
         console.log('unknown date', date.toISODate());
+        console.log(this.knownDates);
         // find missing & fetch missing range
         const missing = this.dateRange(date)
-              .filter((ts) => !this.docsByDay[ts]);
+              .filter((ts) => !this.knownDates[ts]);
         // ask for first to last
         this.lastQuery.fetchMore({
           variables: {