fix adding tag

Author: yedpodtrzitko

tagstudio/src/core/library/alchemy/library.py

@@ -723,9 +723,16 @@ def add_field_tag(
                         entry_id=entry.id,
                         position=0,
                     )
+                    session.add(field)
+                    session.flush()
+
+                # create record for `TagField` table
+                tag_field = TagField(
+                    tag_id=tag.id,
+                    field_id=field.id,
+                )
+                session.add(tag_field)
 
-                field.tags = field.tags | {tag}
-                session.add(field)
                 session.commit()
                 logger.info(
                     "tag added to field", tag=tag, field=field, entry_id=entry.id

tagstudio/src/qt/widgets/tag_box.py

@@ -148,7 +148,6 @@ def add_tag_callback(self, tag_id: int):
         logger.info("add_tag_callback", tag_id=tag_id, selected=self.driver.selected)
 
         tag = self.driver.lib.get_tag(tag_id=tag_id)
-
         for idx in self.driver.selected:
             entry: Entry = self.driver.frame_content[idx]