I will dive straight into the code of the application I'm developing using Google App Engine in Python:
import os
import webapp2
import jinja2
from google.appengine.ext import db
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir), autoescape=True)
class Handler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
def render_str(self, template, **params):
t = jinja_env.get_template(template)
return t.render(params)
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
class Users(db.Model):
name = db.StringProperty(required = True)
password = db.StringProperty(required = True)
email = db.EmailProperty(required = True)
address = db.PostalAddressProperty(required = True)
join_date = db.DateTimeProperty(auto_now_add = True)
dob = db.DateTimeProperty()
phone = db.PhoneNumberProperty()
class Orders(db.Model):
name = db.StringProperty(required = True)
email = db.EmailProperty(required = True)
address = db.PostalAddressProperty(required = True)
class MainPage(Handler):
def get(self):
self.render("home.html")
class Register(Handler):
def get(self):
self.render("signup-form.html")
def post(self):
name = self.request.get("username")
password = self.request.get("password")
verify = self.request.get("verify")
email = self.request.get("email")
address = self.request.get("address")
phone = self.request.get("phone")
a = Users(name = name, password = password, email = email, address = address, phone = phone)
a.put()
self.response.write("Registration successful!")
class MP(Handler):
def get(self):
self.render("mp.html")
def post(self):
self.render("order2.html")
class Order2Login(Handler, Register):
def get(self):
self.render("orderlogin.html")
def post(self):
old_usr = self.request.get("loginname")
old_pwd = self.request.get("loginpwd")
ans = a.filter("name =", old_usr).filter("password =", old_pwd)
if ans:
self.response.write("You are a registered member!")
else:
self.response.write("You are NOT registered.")
class Order2New(Handler):
def get(self):
self.response.write("New user yeah")
app = webapp2.WSGIApplication([('/', MainPage),
('/register', Register),
('/mp', MP),
('/order2new', Order2New),
('/order2login', Order2Login)], debug=True)
Now, in the Order2Login class, I needed to access the database object 'a' so that I can confirm whether a user is already a member of my website. Now, for that, I inherited the Register class in my Order2Login class, since the 'a' object was initially created in the Register class.
However, after running my application on my local machine, I get the following error:
TypeError: Error when calling the metaclass bases
Cannot create a consistent method resolution
order (MRO) for bases Handler, Register
What seems to be the problem in my code?