[DPE-3308][3.1.7] Secrets fix 3.1.7 running on 3.1.7 (#331)

Contents of #330
running on 3.1.7

.github/workflows/ci.yaml

@@ -100,7 +100,6 @@ jobs:
         with:
           provider: lxd
           juju-channel: 3.1/stable
-          bootstrap-options: "--agent-version 3.1.6"
       - name: Download packed charm(s)
         uses: actions/download-artifact@v3
         with:

lib/charms/mongodb/v0/mongodb_secrets.py

@@ -6,7 +6,7 @@
 
 from ops import Secret, SecretInfo
 from ops.charm import CharmBase
-from ops.model import SecretNotFoundError
+from ops.model import ModelError, SecretNotFoundError
 
 from config import Config
 from exceptions import SecretAlreadyExistsError
@@ -93,7 +93,21 @@ def get_content(self) -> Dict[str, str]:
         """Getting cached secret content."""
         if not self._secret_content:
             if self.meta:
-                self._secret_content = self.meta.get_content()
+                try:
+                    self._secret_content = self.meta.get_content(refresh=True)
+                except (ValueError, ModelError) as err:
+                    # https://bugs.launchpad.net/juju/+bug/2042596
+                    # Only triggered when 'refresh' is set
+                    known_model_errors = [
+                        "ERROR either URI or label should be used for getting an owned secret but not both",
+                        "ERROR secret owner cannot use --refresh",
+                    ]
+                    if isinstance(err, ModelError) and not any(
+                        msg in str(err) for msg in known_model_errors
+                    ):
+                        raise
+                    # Due to: ValueError: Secret owner cannot use refresh=True
+                    self._secret_content = self.meta.get_content()
         return self._secret_content
 
     def set_content(self, content: Dict[str, str]) -> None: