reimplement relation-based collection attributes

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2844 fd906abe-77d9-0310-91a1-e0d9ade77398

commerce/README.txt

@@ -8,35 +8,59 @@ Commerce: Shope, Products, Customers, Orders, ...
 Shops and Products
 ==================
 
-Let's start with a Shop:
+Let's start with two shops:
 
-  >>> from cybertools.commerce.base import Shop
+  >>> from cybertools.commerce.shop import Shop
   >>> shop1 = Shop(u'shop1', u'PC up Ltd')
+  >>> shop2 = Shop(u'shop2', u'Video up Ltd')
 
-Now we add products to the shop.
+Now we add products to the shops.
 
   >>> from cybertools.commerce.product import Product
   >>> p001 = Product(u'p001', u'Silent Case')
+  >>> p002 = Product(u'p002', u'Portable Projector')
+  >>> p003 = Product(u'p003', u'HD Flatscreen Monitor')
+  >>> p004 = Product(u'p004', u'Giga Mainboard')
 
   >>> shop1.products.add(p001)
+  >>> shop1.products.add(p003)
+  >>> shop1.products.add(p004)
+  >>> shop2.products.add(p002)
+  >>> shop2.products.add(p003)
 
-  >>> sorted((name, p.title) for name, p in shop1.products.items())
-  [(u'p001', u'Silent Case')]
+  >>> sorted((p.productId, p.title) for p in shop1.products)
+  [(u'p001', u'Silent Case'), (u'p003', u'HD Flatscreen Monitor'),
+   (u'p004', u'Giga Mainboard')]
 
-Let's have a look at the product - it should correctly reference the shop
+Let's have a look at the product - it should correctly reference the shops
 it belongs to.
 
-  >>> len(p001.shops)
-  1
-  >>> p001.shops.keys()[0]
-  u'shop1'
+  >>> sorted((s.name, s.title) for s in p003.shops)
+  [(u'shop1', u'PC up Ltd'), (u'shop2', u'Video up Ltd')]
 
 
 Customers
 =========
 
   >>> from cybertools.commerce.customer import Customer
-  >>> c001 = Customer(u'c001', u'Your Local Store')
+  >>> c001 = Customer(u'c001', u'Your Local Computer Store')
+  >>> c002 = Customer(u'c002', u'Speedy Gonzales')
+  >>> c003 = Customer(u'c003', u'TeeVee')
+  >>> c004 = Customer(u'c004', u'MacVideo')
+
+  >>> shop1.customers.add(c001)
+  >>> shop1.customers.add(c002)
+  >>> shop1.customers.add(c004)
+  >>> shop2.customers.add(c002)
+  >>> shop2.customers.add(c003)
+  >>> shop2.customers.add(c004)
+
+  >>> sorted((c.customerId, c.title) for c in shop1.customers)
+  [(u'c001', u'Your Local Computer Store'), (u'c002', u'Speedy Gonzales'),
+   (u'c004', u'MacVideo')]
+
+  >>> sorted((s.name, s.title) for s in c002.shops)
+  [(u'shop1', u'PC up Ltd'), (u'shop2', u'Video up Ltd')]
 
 
 Orders

commerce/common.py

@@ -32,7 +32,7 @@ class RelationSet(object):
 
     def add(self, related):
         self.data[related.name] = related
-        relatedData = getattr(related, self.attributeName)
+        relatedData = getattr(related, self.attributeName).data
         relatedData[self.parent.name] = self.parent
 
     def remove(self, related):
@@ -42,24 +42,9 @@ class RelationSet(object):
         else:
             name = related.name
         del self.data[name]
-        relatedData = getattr(related, self.attributeName)
+        relatedData = getattr(related, self.attributeName).data
         del relatedData[self.parent.name]
 
-    def __getitem__(self, key):
-        return self.data[key]
-
-    def get(self, key, default=None):
-        return self.data.get(key, default)
-
-    def __contains__(self, key):
-        return key in self.data
-
-    def items(self):
-        return self.data.items()
-
-    def keys(self):
-        return self.data.keys()
-
-    def values(self):
-        return self.data.values()
-
+    def __iter__(self):
+        for obj in self.data.values():
+            yield obj

commerce/customer.py

@@ -24,6 +24,7 @@ $Id$
 
 from zope.interface import implements, Interface
 
+from cybertools.commerce.common import RelationSet
 from cybertools.commerce.interfaces import ICustomer
 
 
@@ -31,8 +32,10 @@ class Customer(object):
 
     implements(ICustomer)
 
+    collection = RelationSet
+
     def __init__(self, customerId, title=None, client=None):
         self.name = self.customerId = customerId
         self.title = title or u'unknown'
         self.client = client
-        self.shops = {}
+        self.shops = self.collection(self, 'customers')

commerce/product.py

@@ -24,6 +24,7 @@ $Id$
 
 from zope.interface import implements, Interface
 
+from cybertools.commerce.common import RelationSet
 from cybertools.commerce.interfaces import IProduct
 
 
@@ -31,8 +32,10 @@ class Product(object):
 
     implements(IProduct)
 
+    collection = RelationSet
+
     def __init__(self, productId, title=None):
         self.name = self.productId = productId
         self.title = title or u'unknown'
-        self.shops = {}
+        self.shops = self.collection(self, 'products')
 

commerce/shop.py

@@ -32,10 +32,10 @@ class Shop(object):
 
     implements(IShop)
 
-    mappingAttribute = RelationSet
+    collection = RelationSet
 
     def __init__(self, name, title=None):
         self.name = name
         self.title = title or u'Shop'
-        self.products = self.mappingAttribute(self, 'shops')
-        self.customers = self.mappingAttribute(self, 'shops')
+        self.products = self.collection(self, 'shops')
+        self.customers = self.collection(self, 'shops')