fix(kanban): make loading tasks for a bucket work

This fixes two closely-related bugs:
1. When loading tasks from a bucket of a saved filter, the saved filter query would override the user-supplied filter, which would cause to only tasks matching the saved filter query to be returned.
2. When a filter query for a bucket was specified, the function would only check if one of the top level filters was a filter for tasks in a specific bucket. That means a filter like "bucket_id = 42 && labels = foo" would return the expected result, while a filter like "labels = foo && (bucket_id = 42 && priority = 1)" would fail with an error 500 because the task_buckets table was not joined to the sql query. The fix from the first bug caused such filter queries.

pkg/models/task_collection.go

@@ -262,6 +262,10 @@ func (tf *TaskCollection) ReadAll(s *xorm.Session, a web.Auth, search string, pa
 		tc.ProjectID = tf.ProjectID
 		tc.isSavedFilter = true
 
+		if tf.Filter != "" {
+			tc.Filter = "(" + tf.Filter + ") && (" + tc.Filter + ")"
+		}
+
 		return tc.ReadAll(s, a, search, page, perPage)
 	}
 
@@ -281,11 +285,13 @@ func (tf *TaskCollection) ReadAll(s *xorm.Session, a web.Auth, search string, pa
 			}
 		}
 
-		if view.BucketConfigurationMode == BucketConfigurationModeFilter && strings.Contains(tf.Filter, "bucket_id") {
+		if strings.Contains(tf.Filter, "bucket_id") {
 			filteringForBucket = true
-			tf.Filter, err = getFilterValueForBucketFilter(tf.Filter, view)
-			if err != nil {
-				return nil, 0, 0, err
+			if view.BucketConfigurationMode == BucketConfigurationModeFilter {
+				tf.Filter, err = getFilterValueForBucketFilter(tf.Filter, view)
+				if err != nil {
+					return nil, 0, 0, err
+				}
 			}
 		}
 	}

pkg/models/task_search.go

@@ -206,6 +206,22 @@ func convertFiltersToDBFilterCond(rawFilters []*taskFilter, includeNulls bool) (
 	return filterCond, nil
 }
 
+func hasBucketIDInParsedFilter(filters []*taskFilter) bool {
+	for _, filter := range filters {
+		if subfilters, is := filter.value.([]*taskFilter); is {
+			has := hasBucketIDInParsedFilter(subfilters)
+			if has {
+				return true
+			}
+		}
+		if filter.field == taskPropertyBucketID {
+			return true
+		}
+	}
+
+	return false
+}
+
 //nolint:gocyclo
 func (d *dbTaskSearcher) Search(opts *taskSearchOptions) (tasks []*Task, totalCount int64, err error) {
 
@@ -214,13 +230,7 @@ func (d *dbTaskSearcher) Search(opts *taskSearchOptions) (tasks []*Task, totalCo
 		return nil, 0, err
 	}
 
-	var joinTaskBuckets bool
-	for _, filter := range opts.parsedFilters {
-		if filter.field == taskPropertyBucketID {
-			joinTaskBuckets = true
-			break
-		}
-	}
+	joinTaskBuckets := hasBucketIDInParsedFilter(opts.parsedFilters)
 
 	filterCond, err := convertFiltersToDBFilterCond(opts.parsedFilters, opts.filterIncludeNulls)
 	if err != nil {