Filter the data loaders given to the 'prepare()' method of autonomous algorithms

beat/backend/python/algorithm.py

@@ -186,7 +186,10 @@ class Runner(object):
 
         # The method is optional
         if hasattr(self.obj, 'prepare'):
-            self.prepared = loader.run(self.obj, 'prepare', self.exc, data_loaders)
+            if self.algorithm.type == Algorithm.AUTONOMOUS:
+                self.prepared = loader.run(self.obj, 'prepare', self.exc, data_loaders.secondaries())
+            else:
+                self.prepared = loader.run(self.obj, 'prepare', self.exc, data_loaders)
         else:
             self.prepared = True
 

beat/backend/python/data_loaders.py

@@ -353,4 +353,6 @@ class DataLoaderList(object):
             if data_loader is not self.main_loader:
                 secondaries_list.add(data_loader)
 
+        secondaries_list.main_loader = None
+
         return secondaries_list