Add backend logic for column filtering

corehq/apps/data_cleaning/models.py

@@ -96,6 +96,18 @@ def add_column_filter(self, prop_id, data_type, match_type, value=None):
             value=value,
         )
 
+    def reorder_column_filters(self, filter_ids):
+        """
+        This updates the order of column filters for this session
+        :param filter_ids: list of uuids matching filter_id field of BulkEditColumnFilters
+        """
+        if len(filter_ids) != self.column_filters.count():
+            raise ValueError("the lengths of column_ids and available column filters do not match")
+        for index, filter_id in enumerate(filter_ids):
+            column_filter = self.column_filters.get(filter_id=filter_id)
+            column_filter.index = index
+            column_filter.save()
+
 
 class DataType:
     TEXT = 'text'

corehq/apps/data_cleaning/tests/test_session.py

@@ -124,3 +124,28 @@ def test_add_column_filters(self):
         for index, prop_id in enumerate(['watered_on', 'name', 'num_leaves', 'pot_type', 'height_cm']):
             self.assertEqual(column_filters[index].prop_id, prop_id)
             self.assertEqual(column_filters[index].index, index)
+
+    def test_reorder_column_filters(self):
+        session = BulkEditSession.new_case_session(self.django_user, self.domain_name, self.case_type)
+        session.add_column_filter('watered_on', DataType.DATE, FilterMatchType.IS_NOT_MISSING)
+        session.add_column_filter('name', DataType.TEXT, FilterMatchType.PHONETIC, "lowkey")
+        session.add_column_filter('num_leaves', DataType.INTEGER, FilterMatchType.GREATER_THAN, "2")
+        session.add_column_filter('pot_type', DataType.DATE, FilterMatchType.IS_EMPTY)
+        session.add_column_filter('height_cm', DataType.DECIMAL, FilterMatchType.LESS_THAN_EQUAL, "11.0")
+        column_filters = session.column_filters.all()
+        new_order = [column_filters[1].filter_id, column_filters[2].filter_id]
+        with self.assertRaises(ValueError):
+            session.reorder_column_filters(new_order)
+        new_order_final = [
+            column_filters[1].filter_id,
+            column_filters[0].filter_id,
+            column_filters[2].filter_id,
+            column_filters[4].filter_id,
+            column_filters[3].filter_id,
+        ]
+        session.reorder_column_filters(new_order_final)
+        reordered_prop_ids = [c.prop_id for c in session.column_filters.all()]
+        self.assertEqual(
+            reordered_prop_ids,
+            ['name', 'watered_on', 'num_leaves', 'height_cm', 'pot_type']
+        )