Corrects "electrode diffusivity" error catch (#4267)

* fix: error catch for electrode diffusivity

* refactor: update diffusivity error catch and test

* tests: up coverage for diffusivity name catches

* Update pybamm/util.py

Co-authored-by: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>

---------

Co-authored-by: Eric G. Kratz <kratman@users.noreply.github.com>
Co-authored-by: Ferran Brosa Planella <Ferran.Brosa-Planella@warwick.ac.uk>
Co-authored-by: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>

pybamm/util.py

@@ -57,14 +57,22 @@ def __getitem__(self, key):
         try:
             return super().__getitem__(key)
         except KeyError as error:
-            if "particle diffusivity" in key:
-                warn(
-                    f"The parameter '{key.replace('particle', 'electrode')}' "
-                    f"has been renamed to '{key}'",
-                    DeprecationWarning,
-                    stacklevel=2,
+            if "electrode diffusivity" in key or "particle diffusivity" in key:
+                old_term, new_term = (
+                    ("electrode", "particle")
+                    if "electrode diffusivity" in key
+                    else ("particle", "electrode")
                 )
-                return super().__getitem__(key.replace("particle", "electrode"))
+                alternative_key = key.replace(old_term, new_term)
+
+                if old_term == "electrode":
+                    warn(
+                        f"The parameter '{alternative_key}' has been renamed to '{key}' and will be removed in a future release. Using '{key}'",
+                        DeprecationWarning,
+                        stacklevel=2,
+                    )
+
+                return super().__getitem__(alternative_key)
             if key in ["Negative electrode SOC", "Positive electrode SOC"]:
                 domain = key.split(" ")[0]
                 raise KeyError(

tests/unit/test_util.py

@@ -36,6 +36,11 @@ def test_fuzzy_dict(self):
                 "SEI current": 3,
                 "Lithium plating current": 4,
                 "A dimensional variable [m]": 5,
+                "Positive particle diffusivity [m2.s-1]": 6,
+            }
+        )
+        d2 = pybamm.FuzzyDict(
+            {
                 "Positive electrode diffusivity [m2.s-1]": 6,
             }
         )
@@ -58,6 +63,16 @@ def test_fuzzy_dict(self):
         with self.assertRaisesRegex(KeyError, "Upper voltage"):
             d.__getitem__("Open-circuit voltage at 100% SOC [V]")
 
+        assert (
+            d2["Positive particle diffusivity [m2.s-1]"]
+            == d["Positive particle diffusivity [m2.s-1]"]
+        )
+
+        assert (
+            d2["Positive electrode diffusivity [m2.s-1]"]
+            == d["Positive electrode diffusivity [m2.s-1]"]
+        )
+
         with self.assertWarns(DeprecationWarning):
             self.assertEqual(
                 d["Positive electrode diffusivity [m2.s-1]"],