purchase_stock_usability: Add picking_status for PO ...like in sale_stock_usability : https://github.com/akretion/odoo-usability/blob/14.0/sale_stock_usability/models/sale_order.py#L14

purchase_stock_usability/models/purchase.py

@@ -10,6 +10,44 @@ class PurchaseOrder(models.Model):
 
     picking_type_id = fields.Many2one(tracking=True)
     incoterm_id = fields.Many2one(tracking=True)
+    picking_status = fields.Selection([
+        ('received', 'Fully Received'),
+        ('partially_received', 'Partially Received'),
+        ('to_receive', 'To Receive'),
+        ('cancel', 'Receipt Cancelled'),
+        ('no', 'Nothing to Receive')
+        ], string='Picking Status', compute='_compute_picking_status',
+        store=True)
+
+    @api.depends('state', 'picking_ids.state')
+    def _compute_picking_status(self):
+        """
+        Compute the picking status for the PO. Possible statuses:
+        - no: if the PO is not in status 'purchase' nor 'done', we consider that
+          there is nothing to receive. This is also the default value if the
+          conditions of no other status is met.
+        - cancel: all pickings are cancelled
+        - received: if all  pickings are done or cancel.
+        - partially_received: If at least one picking is done.
+        - to_receive: if all pickings are in confirmed, assigned, waiting or
+          cancel state.
+        """
+        for order in self:
+            picking_status = 'no'
+            if order.state in ('purchase', 'done') and order.picking_ids:
+                pstates = [
+                    picking.state for picking in order.picking_ids]
+                if all([state == 'cancel' for state in pstates]):
+                    picking_status = 'cancel'
+                elif all([state in ('done', 'cancel') for state in pstates]):
+                    picking_status = 'received'
+                elif any([state == 'done' for state in pstates]):
+                    picking_status = 'partially_received'
+                elif all([
+                        state in ('confirmed', 'assigned', 'waiting', 'cancel')
+                        for state in pstates]):
+                    picking_status = 'to_receive'
+            order.picking_status = picking_status
 
     # inherit compute method of the field delivery_partner_id
     # defined in purchase_usability