Optimised product summary to use database (view)

db.py

@@ -66,6 +66,17 @@ class Product(Base):
     def __str__(self):
         return self.name
 
+
+class UserProducts(Base):
+    __tablename__ = 'user_products'
+    user_name = Column(String(10), ForeignKey('users.name'), primary_key=True)
+    product_id = Column(Integer, ForeignKey("products.product_id"), primary_key=True)
+    count = Column(Integer)
+
+    user = relationship(User, backref=backref('products', order_by=count.desc()), lazy='joined')
+    product = relationship(Product, backref="users", lazy='joined')
+
+
 class PurchaseEntry(Base):
     __tablename__ = 'purchase_entries'
     id = Column(Integer, primary_key=True)

text_based.py

@@ -826,14 +826,20 @@ class ShowUserMenu(Menu):
 
     def print_purchased_products(self, user):
         products = {}
-        for transaction in user.transactions:
+        for ref in user.products:
-            if transaction.purchase:
+            product = ref.product
-                for entry in transaction.purchase.entries:
+            if product in products:
-                    n = entry.product.name
+                products[product] += ref.count
-                    if n in products:
-                        products[n]+=1
             else:
-                        products[n]=1
+                products[product] = ref.count
+        #for transaction in user.transactions:
+        #    if transaction.purchase:
+        #        for entry in transaction.purchase.entries:
+        #            n = entry.product.name
+        #            if n in products:
+        #                products[n]+=1
+        #            else:
+        #                products[n]=1
         num_products = len(products)
         if num_products == 0:
             print 'No products purchased yet'