course update functionality

rowers/courses.py

@@ -28,7 +28,7 @@ from rowers.models import (
     Rower, Workout,
     GeoPoint,GeoPolygon, GeoCourse,
     course_length,course_coord_center,course_coord_maxmin,
-    polygon_coord_center
+    polygon_coord_center,PlannedSession
     )
 
 # low level methods
@@ -307,3 +307,13 @@ def get_time_course(ws,course):
     coursemeters = coursemeters-coursemetersfirst
     
     return coursetimeseconds,coursemeters,coursecompleted
+
+def replacecourse(course1,course2):
+    ps = PlannedSession.objects.filter(course=course1)
+    for p in ps:
+        p.course = course2
+        p.save()
+
+    course1.delete()
+
+    return 1