feat: Add state_model property to Graph class.

src/backend/base/langflow/graph/graph/base.py

@@ -19,6 +19,7 @@
 from langflow.graph.graph.runnable_vertices_manager import RunnableVerticesManager
 from langflow.graph.graph.schema import GraphData, GraphDump, VertexBuildResult
 from langflow.graph.graph.state_manager import GraphStateManager
+from langflow.graph.graph.state_model import create_state_model_from_graph
 from langflow.graph.graph.utils import (
     find_all_cycle_edges,
     find_start_component_id,
@@ -116,6 +117,12 @@ def __init__(
         if (start is not None and end is None) or (start is None and end is not None):
             raise ValueError("You must provide both input and output components")
 
+    @property
+    def state_model(self):
+        if not self._state_model:
+            self._state_model = create_state_model_from_graph(self)
+        return self._state_model
+
     def __add__(self, other):
         if not isinstance(other, Graph):
             raise TypeError("Can only add Graph objects")