Fix component update bug (#6368)

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---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

.changeset/early-geese-relate.md

@@ -0,0 +1,5 @@
+---
+"gradio": patch
+---
+
+fix:Fix component update bug

gradio/component_meta.py

@@ -132,7 +132,13 @@ def updateable(fn):
     def wrapper(*args, **kwargs):
         fn_args = inspect.getfullargspec(fn).args
         self = args[0]
-        if not hasattr(self, "_constructor_args"):
+
+        # We need to ensure __init__ is always called at least once
+        # so that the component has all the variables in self defined
+        # test_blocks.py::test_async_iterator_update_with_new_component
+        # checks this
+        initialized_before = hasattr(self, "_constructor_args")
+        if not initialized_before:
             self._constructor_args = []
         for i, arg in enumerate(args):
             if i == 0 or i >= len(fn_args):  #  skip self, *args
@@ -140,7 +146,7 @@ def updateable(fn):
             arg_name = fn_args[i]
             kwargs[arg_name] = arg
         self._constructor_args.append(kwargs)
-        if in_event_listener():
+        if in_event_listener() and initialized_before:
             return None
         else:
             return fn(self, **kwargs)

test/test_blocks.py

@@ -1575,3 +1575,19 @@ def test_postprocess_update_dict():
             ("New Country B", "New Country B"),
         ],
     }
+
+
+def test_async_iterator_update_with_new_component(connect):
+    async def get_number_stream():
+        for i in range(10):
+            yield gr.Number(value=i, label="Number (updates every second)")
+
+            await asyncio.sleep(0.1)
+
+    demo = gr.Interface(fn=get_number_stream, inputs=None, outputs=["number"])
+    demo.queue()
+
+    with connect(demo) as client:
+        job = client.submit(api_name="/predict")
+        job.result()
+        assert [r["value"] for r in job.outputs()] == list(range(10))