redfam: Add generator for open redfams to Worker

Issue #64 (#64)

lib/redfam.py

@@ -750,6 +750,18 @@ class RedFamWorker( RedFam ):
 
             yield redfam
 
+    @classmethod
+    def gen_open( cls ):
+        """
+        Yield red_fams stored in db by given status which have an ending after
+        given one
+        """
+        for redfam in RedFamWorker.session.query(RedFamWorker).filter(
+                # NOT WORKING WITH OBJECT NOTATION
+                text("status LIKE '%open%'") ):
+
+            yield redfam
+
 
 class RedFamError( Exception ):
     """