Fix state serialization issue (#10036)

* Fix bug

* add changeset

---------

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

.changeset/floppy-hornets-throw.md

@@ -0,0 +1,5 @@
+---
+"gradio": patch
+---
+
+fix:Fix state serialization issue

gradio/components/state.py

@@ -45,12 +45,13 @@ class State(Component):
         )
         self.delete_callback = delete_callback or (lambda a: None)  # noqa: ARG005
         try:
-            self.value = deepcopy(value)
+            value = deepcopy(value)
         except TypeError as err:
             raise TypeError(
                 f"The initial value of `gr.State` must be able to be deepcopied. The initial value of type {type(value)} cannot be deepcopied."
             ) from err
-        super().__init__(value=self.value, render=render)
+        super().__init__(value=value, render=render)
+        self.value = value
 
     @property
     def stateful(self) -> bool:

test/components/test_state.py

@@ -1,8 +1,13 @@
 import pytest
+from pydantic import BaseModel
 
 import gradio as gr
 
 
+class TestModel(BaseModel):
+    name: str
+
+
 class TestState:
     def test_as_component(self):
         state = gr.State(value=5)
@@ -14,6 +19,10 @@ class TestState:
         with pytest.raises(TypeError):
             gr.State(value=gr)  # modules are not deepcopyable
 
+    def test_initial_value_pydantic(self):
+        state = gr.State(value=TestModel(name="Freddy"))
+        assert isinstance(state.value, TestModel)
+
     @pytest.mark.asyncio
     async def test_in_interface(self):
         def test(x, y=" def"):