[IMP] stock: Optimize stock_move.setlast_tracking()

When setlast_tracking is called on a large number of moves in a picking
(e.g.  when splitting moves in a picking), the time to complete grows
exponentially.  The reason is that it loops over all the moves of
a picking, even if it keeps only the last tracking.

The method now uses a search() with a limit so it doesn't need to browse
all the moves.

Added test to check the behaviour of setlast_tracking
Fixes #2448

addons/stock/__openerp__.py

@@ -95,6 +95,7 @@ Dashboard / Reports for Warehouse Management will include:
         'test/opening_stock.yml',
         'test/shipment.yml',
         'test/stock_report.yml',
+        'test/setlast_tracking.yml',
     ],
     'installable': True,
     'application': True,

addons/stock/stock.py

@@ -2214,16 +2214,24 @@ class stock_move(osv.osv):
         return count
 
     def setlast_tracking(self, cr, uid, ids, context=None):
-        tracking_obj = self.pool.get('stock.tracking')
-        picking = self.browse(cr, uid, ids, context=context)[0].picking_id
-        if picking:
-            last_track = [line.tracking_id.id for line in picking.move_lines if line.tracking_id]
-            if not last_track:
-                last_track = tracking_obj.create(cr, uid, {}, context=context)
+        assert len(ids) == 1, "1 ID expected, got %s" % (ids, )
+        tracking_obj = self.pool['stock.tracking']
+        move = self.browse(cr, uid, ids[0], context=context)
+        picking_id = move.picking_id.id
+        if picking_id:
+            move_ids = self.search(cr, uid, [
+                ('picking_id', '=', picking_id),
+                ('tracking_id', '!=', False)
+                ], limit=1, order='tracking_id DESC', context=context)
+            if move_ids:
+                tracking_move = self.browse(cr, uid, move_ids[0],
+                                            context=context)
+                tracking_id = tracking_move.tracking_id.id
             else:
-                last_track.sort()
-                last_track = last_track[-1]
-            self.write(cr, uid, ids, {'tracking_id': last_track})
+                tracking_id = tracking_obj.create(cr, uid, {}, context=context)
+            self.write(cr, uid, move.id,
+                       {'tracking_id': tracking_id},
+                       context=context)
         return True
 
     #

addons/stock/test/setlast_tracking.yml

@@ -0,0 +1,44 @@
+-
+  In order to check if the last tracking is set on moves, I create a picking
+-
+  !record {model: stock.picking, id: shipment_tracking}:
+    type: out
+    location_dest_id: stock_location_output
+-
+  !record {model: stock.move, id: shipment_tracking_move1}:
+    picking_id: shipment_tracking
+    product_id: product_product_6
+    product_uom: product.product_uom_unit
+    product_qty: 10.0
+    location_id: location_monitor
+    location_dest_id: stock_location_output
+-
+  !record {model: stock.move, id: shipment_tracking_move2}:
+    picking_id: shipment_tracking
+    product_id: product_product_6
+    product_uom: product.product_uom_unit
+    product_qty: 10.0
+    location_id: location_monitor
+    location_dest_id: stock_location_output
+-
+  Then I call setlast_tracking on the moves and check if the tracking is correct
+-
+  !python {model: stock.move}: |
+    move_id = ref('shipment_tracking_move1')
+    move = self.browse(cr, uid, move_id)
+    assert not move.tracking_id, "Move1 must not have a tracking at this point"
+    tracking_ids = self.pool['stock.tracking'].search(cr, uid, [])
+    self.setlast_tracking(cr, uid, [move_id])
+    move.refresh()
+    tracking_id = move.tracking_id.id
+    assert tracking_id, "The move must have a tracking_id"
+    assert tracking_id not in tracking_ids, "The tracking must be a new one"
+
+    move2_id = ref('shipment_tracking_move2')
+    move2 = self.browse(cr, uid, move2_id)
+    assert not move2.tracking_id, "Move2 must not have a tracking at this point"
+    self.setlast_tracking(cr, uid, [move2_id])
+    move2.refresh()
+    tracking2_id = move2.tracking_id.id
+    assert tracking2_id, "Move2 must have a tracking_id"
+    assert tracking2_id == tracking_id, "The second move must have the same tracking than the previous one"