Set mongodb-odm-bundle default database

doctrine/mongodb-odm-bundle/3.3/config/packages/doctrine_mongodb.yaml

@@ -5,6 +5,7 @@ doctrine_mongodb:
         default:
             server: '%env(MONGODB_URL)%'
             options: {}
+    default_database: '%env(MONGODB_DB)%'
     document_managers:
         default:
             auto_mapping: true

doctrine/mongodb-odm-bundle/3.3/manifest.json

@@ -7,6 +7,7 @@
         "src/": "%SRC_DIR%/"
     },
     "env": {
-        "MONGODB_URL": "mongodb://localhost:27017/symfony"
+        "MONGODB_URL": "mongodb://localhost:27017",
+        "MONGODB_DB": "symfony"
     }
 }