refac

backend/open_webui/utils/middleware.py

@@ -2102,6 +2102,35 @@ async def process_chat_payload(request, form_data, user, metadata, model):
     # -> Chat Code Interpreter (Form Data Update) -> (Default) Chat Tools Function Calling
     # -> Chat Files
 
+    # Arena model resolution — pick the sub-model now so all downstream
+    # processing (knowledge, capabilities, tools, params) uses its settings
+    # instead of the empty arena wrapper.
+    if model.get('owned_by') == 'arena':
+        arena_model_ids = model.get('info', {}).get('meta', {}).get('model_ids')
+        arena_filter_mode = model.get('info', {}).get('meta', {}).get('filter_mode')
+        if arena_model_ids and arena_filter_mode == 'exclude':
+            arena_model_ids = [
+                available_model['id']
+                for available_model in request.app.state.MODELS.values()
+                if available_model.get('owned_by') != 'arena' and available_model['id'] not in arena_model_ids
+            ]
+
+        if isinstance(arena_model_ids, list) and arena_model_ids:
+            selected_model_id = random.choice(arena_model_ids)
+        else:
+            arena_model_ids = [
+                available_model['id']
+                for available_model in request.app.state.MODELS.values()
+                if available_model.get('owned_by') != 'arena'
+            ]
+            selected_model_id = random.choice(arena_model_ids)
+
+        selected_model = request.app.state.MODELS.get(selected_model_id)
+        if selected_model:
+            model = selected_model
+            form_data['model'] = selected_model_id
+            metadata['selected_model_id'] = selected_model_id
+
     form_data = apply_params_to_form_data(form_data, model)
     log.debug(f'form_data: {form_data}')