update supplierinfo instead of creating a new onewhen reassociating

orders/static/css/oders_helper_style.css

@@ -291,7 +291,7 @@
     margin: 30px 0 20px 0;
     position: -webkit-sticky;
     position: sticky;
-    top: 150px;
+    top: 140px;
     z-index: 5;
 }
 

products/models.py

@@ -137,6 +137,28 @@ class CagetteProduct(models.Model):
         package_qty = data["package_qty"]
         price = data["price"]
         
+        # Look for existing association
+        f = ["id"]
+        c = [['product_tmpl_id', '=', product_tmpl_id], ['name', '=', partner_id]]
+        res_existing_supplierinfo = api.search_read('product.supplierinfo', c, f)
+
+        if (len(res_existing_supplierinfo) > 0):
+            # A relation already exists, update it's start & end dates 
+            psi_id = res_existing_supplierinfo[0]['id']
+
+            today = datetime.date.today().strftime("%Y-%m-%d")
+
+            f = {
+                'date_start': today,
+                'date_end': False
+            }
+
+            try:
+                res["update"] = api.update('product.supplierinfo', psi_id, f)
+            except Exception as e:
+                res['error'] = str(e)
+        else:
+            # Relation doesn't exists, create one
             f = ["id", "standard_price", "purchase_ok"]
             c = [['product_tmpl_id', '=', product_tmpl_id]]
             res_products = api.search_read('product.product', c, f)
@@ -174,7 +196,10 @@ class CagetteProduct(models.Model):
         f = ["id"]
         c = [['product_tmpl_id', '=', product_tmpl_id], ['name', '=', partner_id], ['date_end', '=', False]]
         res_supplierinfo = api.search_read('product.supplierinfo', c, f)
-        psi_id = res_supplierinfo[0]['id']
+
+        # End all active associations in case multiple are open (which shouldn't happen)
+        for psi in res_supplierinfo:
+            psi_id = psi['id']
 
             today = datetime.date.today().strftime("%Y-%m-%d")