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Update routing.py to handle circular references #11425

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1 change: 1 addition & 0 deletions fastapi/routing.py
Original file line number Diff line number Diff line change
Expand Up @@ -1204,6 +1204,7 @@ def read_users():
app.include_router(internal_router)
```
"""
assert id(self) != id(router), "Router cannot be the same as parent"
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if prefix:
assert prefix.startswith("/"), "A path prefix must start with '/'"
assert not prefix.endswith(
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