Replace earlier convert functions that have the same name

sqlite_utils/db.py

@@ -4235,7 +4235,10 @@ def convert_value(v):
             fn_name = getattr(fn, "__name__", "fn")
             if fn_name == "<lambda>":
                 fn_name = f"lambda_{abs(hash(fn))}"
-            self.db.register_function(convert_value, name=fn_name)
+            # replace=True: a previous .convert() may have registered a
+            # different callable under the same name, e.g. two bound methods
+            # called "get" or two functools.partial objects
+            self.db.register_function(convert_value, name=fn_name, replace=True)
             sql = "update {} set {sets}{where};".format(
                 quote_identifier(self.name),
                 sets=", ".join(

tests/test_convert.py

@@ -1,3 +1,5 @@
+import functools
+
 import pytest
 
 from sqlite_utils.db import BadMultiValues
@@ -158,3 +160,20 @@ def test_convert_repeated(fresh_db):
     table.convert(col, lambda x: x * 2)
     table.convert(col, lambda _x: 0)
     assert table.get(1) == {col: 0}
+
+
+def test_convert_repeated_callables_with_same_name(fresh_db):
+    # Different callables can share a name: bound methods such as dict.get,
+    # or functools.partial objects, which have no __name__ at all
+    table = fresh_db.table("places")
+    table.insert({"id": 1, "state": "CA", "country": "US"}, pk="id")
+    table.convert("state", {"CA": "California"}.get)
+    table.convert("country", {"US": "United States"}.get)
+    assert table.get(1) == {"id": 1, "state": "California", "country": "United States"}
+    table.convert("state", functools.partial("{}!".format))
+    table.convert("country", functools.partial("{}?".format))
+    assert table.get(1) == {
+        "id": 1,
+        "state": "California!",
+        "country": "United States?",
+    }