(core) Keep track of row counts per table

Summary: Displays a live row count of each table on the Raw Data page.

Test Plan: Browser tests.

Reviewers: alexmojaki

Reviewed By: alexmojaki

Differential Revision: https://phab.getgrist.com/D3540

sandbox/grist/engine.py

@@ -1262,11 +1262,13 @@ class Engine(object):
     self._unused_lookups.add(lookup_map_column)
 
   def count_rows(self):
-    return sum(
-      table._num_rows()
-      for table_id, table in six.iteritems(self.tables)
-      if useractions.is_user_table(table_id) and not table._summary_source_table
-    )
+    result = {"total": 0}
+    for table_rec in self.docmodel.tables.all:
+      if useractions.is_user_table(table_rec.tableId):
+        count = self.tables[table_rec.tableId]._num_rows()
+        result[table_rec.id] = count
+        result["total"] += count
+    return result
 
   def apply_user_actions(self, user_actions, user=None):
     """

sandbox/grist/test_useractions.py

@@ -1266,7 +1266,7 @@ class TestUserActions(test_engine.EngineTestCase):
     for i in range(20):
       self.add_record("Address", None)
       self.assertEqual(i + 1, table._num_rows())
-      self.assertEqual(i + 1, self.engine.count_rows())
+      self.assertEqual({1: i + 1, "total": i + 1}, self.engine.count_rows())
 
   def test_raw_view_section_restrictions(self):
     # load_sample handles loading basic metadata, but doesn't create any view sections