Add db_for_read, db_for_write to encrypted router

Author: aclark4life

.github/workflows/mongodb_settings.py

@@ -2,6 +2,8 @@
 
 from pymongo.uri_parser import parse_uri
 
+from django_mongodb_backend.utils import model_has_encrypted_fields
+
 if mongodb_uri := os.getenv("MONGODB_URI"):
     db_settings = {
         "ENGINE": "django_mongodb_backend",
@@ -34,6 +36,13 @@
 
 
 class EncryptedRouter:
+    def db_for_read(self, model, **hints):
+        if model_has_encrypted_fields(model):
+            return "encrypted"
+        return "default"
+
+    db_for_write = db_for_read
+
     def allow_migrate(self, db, app_label, model_name=None, **hints):
         # The encryption_ app's models are only created in the encrypted
         # database.