FetchingCoordinator -> fetcher_factory (better name)

sqlalchemy_utils/functions/batch_fetch.py

@@ -143,30 +143,28 @@ def batch_fetch(entities, *attr_paths):
     """
 
     if entities:
-        fetcher = FetchingCoordinator()
+        for path in attr_paths:
-        for attr_path in attr_paths:
+            fetcher = fetcher_factory(entities, path)
-            fetcher(entities, attr_path)
+            fetcher.fetch()
+            fetcher.populate()
 
 
-class FetchingCoordinator(object):
+def fetcher_factory(entities, path):
-    def __call__(self, entities, path):
+    populate_backrefs = False
-        populate_backrefs = False
+    if isinstance(path, with_backrefs):
-        if isinstance(path, with_backrefs):
+        path = path.path
-            path = path.path
+        populate_backrefs = True
-            populate_backrefs = True
 
-        if isinstance(path, CompositePath):
+    if isinstance(path, CompositePath):
-            fetchers = []
+        fetchers = []
-            for path in path.paths:
+        for path in path.paths:
-                fetchers.append(
+            fetchers.append(
-                    Path.parse(entities, path, populate_backrefs).fetcher
+                Path.parse(entities, path, populate_backrefs).fetcher
-                )
+            )
 
-            fetcher = CompositeFetcher(*fetchers)
+        return CompositeFetcher(*fetchers)
-        else:
+    else:
-            fetcher = Path.parse(entities, path, populate_backrefs).fetcher
+        return Path.parse(entities, path, populate_backrefs).fetcher
-        fetcher.fetch()
-        fetcher.populate()
 
 
 class CompositeFetcher(object):