db.py

@@ -9,141 +9,142 @@ Base = declarative_base()
 Session = sessionmaker(bind=engine)
 
 class User(Base):
-	__tablename__ = 'users'
-	name = Column(String(10), primary_key=True)
-	card = Column(String(10))
-	rfid = Column(String(10))
-	credit = Column(Integer)
+    __tablename__ = 'users'
+    name = Column(String(10), primary_key=True)
+    card = Column(String(10))
+    rfid = Column(String(10))
+    credit = Column(Integer)
 
-	name_re = r"[a-z]+"
-	card_re = r"(([Nn][Tt][Nn][Uu])?[0-9]+)?"
-	rfid_re = r"[0-9]*"
+    name_re = r"[a-z]+"
+    card_re = r"(([Nn][Tt][Nn][Uu])?[0-9]+)?"
+    rfid_re = r"[0-9]*"
 
-	def __init__(self, name, card, rfid, credit=0):
-		self.name = name
-		if card == '':
-			card = None
-		self.card = card
-		if rfid == '':
-			rfid = None
-		self.rfid = rfid
-		self.credit = credit
+    def __init__(self, name, card, rfid, credit=0):
+        self.name = name
+        if card == '':
+            card = None
+        self.card = card
+        if rfid == '':
+            rfid = None
+        self.rfid = rfid
+        self.credit = credit
 
-	def __repr__(self):
-		return "<User('%s')>" % self.name
+    def __repr__(self):
+        return "<User('%s')>" % self.name
 
-	def __str__(self):
-		return self.name
+    def __str__(self):
+        return self.name
 
-	def is_anonymous(self):
-		return self.card == '11122233'
+    def is_anonymous(self):
+        return self.card == '11122233'
 
 class Product(Base):
-	__tablename__ = 'products'
+    __tablename__ = 'products'
 
-	bar_code = Column(String(13), primary_key=True)
-	name = Column(String(45))
-	price = Column(Integer)
-        stock = Column(Integer)
+    bar_code = Column(String(13), primary_key=True)
+    name = Column(String(45))
+    price = Column(Integer)
+    stock = Column(Integer)
 
-	bar_code_re = r"[0-9]+"
-	name_re = r".+"
-	name_length = 45
+    bar_code_re = r"[0-9]+"
+    name_re = r".+"
+    name_length = 45
 
-	def __init__(self, bar_code, name, price, stock=0):
-		self.name = name
-		self.bar_code = bar_code
-		self.price = price
-                self.stock = stock
+    def __init__(self, bar_code, name, price, stock=0):
+        self.name = name
+        self.bar_code = bar_code
+        self.price = price
+        self.stock = stock
 
-	def __repr__(self):
-		return "<Product('%s', '%s', '%s', '%s')>" % (self.name, self.bar_code, self.price, self.stock)
+    def __repr__(self):
+        return "<Product('%s', '%s', '%s', '%s')>" % (self.name, self.bar_code, self.price, self.stock)
 
-	def __str__(self):
-		return self.name
+    def __str__(self):
+        return self.name
 
 class PurchaseEntry(Base):
-	__tablename__ = 'purchase_entries'
-	id = Column(Integer, primary_key=True)
-	purchase_id = Column(Integer,ForeignKey("purchases.id"))
-	product_bar_code = Column(String(13),ForeignKey("products.bar_code"))
-	amount = Column(Integer)
+    __tablename__ = 'purchase_entries'
+    id = Column(Integer, primary_key=True)
+    purchase_id = Column(Integer,ForeignKey("purchases.id"))
+    product_bar_code = Column(String(13),ForeignKey("products.bar_code"))
+    amount = Column(Integer)
+
+    product = relationship(Product,backref="purchases")
+
+    def __init__(self, purchase, product, amount):
+        self.product = product
+        self.product_bar_code = product.bar_code
+        self.purchase = purchase
+        self.amount = amount
+    def __repr__(self):
+        return "<PurchaseEntry('%s', '%s')>" % (self.product.name, self.amount )
 
-	product = relationship(Product,backref="purchases")
-        
-	def __init__(self, purchase, product, amount):
-		self.product = product
-		self.product_bar_code = product.bar_code
-		self.purchase = purchase
-		self.amount = amount
-	def __repr__(self):
-		return "<PurchaseEntry('%s', '%s')>" % (self.product.name, self.amount )
-		
 
 class Transaction(Base):
-	__tablename__ = 'transactions'
+    __tablename__ = 'transactions'
 
-	id = Column(Integer, primary_key=True)
-	time = Column(DateTime)
-	user_name = Column(String(10), ForeignKey('users.name'))
-	amount = Column(Integer)
-	description = Column(String(50))
-	purchase_id = Column(Integer, ForeignKey('purchases.id'))
+    id = Column(Integer, primary_key=True)
+    time = Column(DateTime)
+    user_name = Column(String(10), ForeignKey('users.name'))
+    amount = Column(Integer)
+    description = Column(String(50))
+    purchase_id = Column(Integer, ForeignKey('purchases.id'))
 
-	user = relationship(User, backref=backref('transactions', order_by=time))
+    user = relationship(User, backref=backref('transactions', order_by=time))
 
-	def __init__(self, user, amount=0, description=None, purchase=None):
-		self.user = user
-		self.amount = amount
-		self.description = description
-		self.purchase = purchase
+    def __init__(self, user, amount=0, description=None, purchase=None, penalty_ratio=1):
+        self.user = user
+        self.amount = amount
+        self.description = description
+        self.purchase = purchase
+        self.penalty_ratio = penalty_ratio
 
-	def perform_transaction(self):
-		self.time = datetime.datetime.now()
-		self.user.credit -= self.amount
-		if self.purchase:
-			for entry in self.purchase.entries:
-				entry.product.stock -= entry.amount
+    def perform_transaction(self):
+        self.time = datetime.datetime.now()
+        self.user.credit -= self.amount * self.penalty_ratio
+        if self.purchase:
+            for entry in self.purchase.entries:
+                entry.product.stock -= entry.amount
 
 
 class Purchase(Base):
-	__tablename__ = 'purchases'
-	
-	id = Column(Integer, primary_key=True)
-	time = Column(DateTime)
-#	user_name = Column(Integer, ForeignKey('users.name'))
-	price = Column(Integer)
-#	performed = Column(Boolean)
+    __tablename__ = 'purchases'
 
-#	user = relationship(User, backref=backref('purchases', order_by=id))
-#	users = relationship(User, secondary=purchase_user, backref='purhcases'
-	transactions = relationship(Transaction, order_by=Transaction.user_name, backref='purchase')
-	entries = relationship(PurchaseEntry, backref=backref("purchase"))
+    id = Column(Integer, primary_key=True)
+    time = Column(DateTime)
+    #	user_name = Column(Integer, ForeignKey('users.name'))
+    price = Column(Integer)
+    #	performed = Column(Boolean)
 
-	def __init__(self):
-		pass
+    #	user = relationship(User, backref=backref('purchases', order_by=id))
+    #	users = relationship(User, secondary=purchase_user, backref='purhcases'
+    transactions = relationship(Transaction, order_by=Transaction.user_name, backref='purchase')
+    entries = relationship(PurchaseEntry, backref=backref("purchase"))
 
-	def __repr__(self):
-		return "<Purchase(%d, %d, '%s')>" % (self.id, self.price, self.time.strftime('%c'))
+    def __init__(self):
+        pass
 
-	def is_complete(self):
-		return len(self.transactions) > 0 and len(self.entries) > 0
+    def __repr__(self):
+        return "<Purchase(%d, %d, '%s')>" % (self.id, self.price, self.time.strftime('%c'))
 
-	def price_per_transaction(self):
-		return self.price/len(self.transactions)
+    def is_complete(self):
+        return len(self.transactions) > 0 and len(self.entries) > 0
 
-	def set_price(self):
-		self.price = 0
-		for entry in self.entries:
-			self.price += entry.amount*entry.product.price
-		if len(self.transactions) > 0:
-			for t in self.transactions:
-				t.amount = self.price_per_transaction()
-	
-	def perform_purchase(self):
-		self.time = datetime.datetime.now()
-		self.set_price()
-		for t in self.transactions:
-			t.perform_transaction()
+    def price_per_transaction(self):
+        return self.price/len(self.transactions)
+
+    def set_price(self):
+        self.price = 0
+        for entry in self.entries:
+            self.price += entry.amount*entry.product.price
+        if len(self.transactions) > 0:
+            for t in self.transactions:
+                t.amount = self.price_per_transaction()
+
+    def perform_purchase(self):
+        self.time = datetime.datetime.now()
+        self.set_price()
+        for t in self.transactions:
+            t.perform_transaction()
 #		self.user.credit -= self.price
 #		self.performed = True