[IMP] fs_storage: replace {db_name} in directory_path

In multi database mode, there was no way to avoid filename collisions

fs_storage/models/fs_storage.py

@@ -162,6 +162,13 @@ def __init__(self, env, ids=(), prefetch_ids=()):
     def _server_env_fields(self):
         return {"protocol": {}, "options": {}, "directory_path": {}}
 
+    def _server_env_read_from_config(self, field_name, config_getter):
+        value = super()._server_env_read_from_config(field_name, config_getter)
+        # replace {db_name} with the dbname
+        if field_name == "directory_path":
+            value = value.format(db_name=self.env.cr.dbname)
+        return value
+
     def write(self, vals):
         self.__fs = None
         self.env.registry.clear_cache()

fs_storage/readme/USAGE.md

@@ -65,6 +65,8 @@ for the following fields:
 - options
 - directory_path
 
+When evaluating directory_path, `{db_name}` is replaced by the database name.
+
 ## Migration from storage_backend
 
 The fs_storage addon can be used to replace the storage_backend addon.

fs_storage/readme/newsfragments/db_name.feature

@@ -0,0 +1 @@
+Replace {db_name} by the database name in directory_path