Thanks for the answer.
Basing in what you said, i have a few questions:
- I really forgot the point of multiple instances, lol.
- Why should i use ndb instead db?
- Actually this questions of save orders and products leaves me with
insomnia, because i need to decide how to construct the appropriate data
structure. I raised the hypothesized of create a "code" for each product,
because i need to send a product list and orders to a .js client via
channel API. In first attempt i tried to store a dictionary, but did not
work so a converted in to a string. However, i guess i got your suggestion,
if i have different data models i cand bind them from the key (email).
- you said: "You might not need any (most) of the indexes", can you please
show me an example?
Best Regards!
Em terça-feira, 27 de janeiro de 2015 13:57:19 UTC-2, Mihail Russu escreveu:
>
> Yes, your ALL_RESTAURANTS list will not always contain the full list of
> Restaurants for many reasons, including the ones you provided.
>
> Also, there are some more things I noticed in your code at a glance:
>
> - Your project will run on multiple instances meaning each instance will
> have its own copy of ALL_RESTAURANTS so you will likely not be getting any
> consistent results of what's in the ALL_RESTAURANTS list.
>
> - You should be using NDB instead of older DB
>
> - It *might *be a good idea to have "orders" and "products" properties
> as separate data models rather than strings.
>
> - Since one email seem to only have one restaurant you could use the
> email address as the "id" of the restaurant, this would let you do free
> "get by id" rather than expensive queries queries.
>
> - You might not need any (most) of the indexes (i.e. you need to specify
> indexed=False next to each property that you do not want to be indexed)
>
> Thanks,
> Mihail.
>
>
> On Tuesday, January 27, 2015 at 1:03:21 PM UTC+2, Saturnino Mateus wrote:
>>
>> I'm facing a problem with code organization with GAE, so i'm trying this
>> solution below. I created a global list wich will contains all Restaurant
>> objects reference, i know that is not good programming practice and here i
>> go with my doubt: is there some how i lost every Restaurant references
>> appended on the list? Like Google server go down and lost?
>>
>> ALL_RESTAURANTS = []
>>
>> class Establishment(db.Model):
>> name = db.StringProperty()
>> email = db.StringProperty()
>> orders = db.StringProperty()
>> products = db.StringProperty()
>> state = db.StringProperty()
>>
>> class Restaurant(object):
>> def __init__(self,name,email):
>> self.name = name
>> self.email = email
>>
>> def save(self):
>> que = db.Query(Establishment)
>> que.filter('email =',self.email)
>> results = que.fetch(limit=1)
>>
>> if len(results)>0:
>> logging.info('Already exist a restaurant associated to this
>> email')
>> return False
>> else:
>> restaurant = Establishment(name=self.name
>> ,email=self.email,products='empty',orders='empty',state='OFFLINE')
>> restaurant.put()
>> logging.info('Restaurant '+self.email+' saved in DB!')
>> return True
>>
>> class TheHandler(webapp2.RequestHandler):
>> def get(self):
>> newRestaurant = Restaurant(name='The Pizza',email='
>> [email protected]')
>> newRestaurant.save()
>> ALL_RESTAURANTS.append(newRestaurant)
>>
>> anotherRestaurant = Restaurant(name='The Other Pizza',email='
>> [email protected]')
>> anotherRestaurant.save()
>>
>> ALL_RESTAURANTS.append(anotherRestaurant)
>> Best Regards...
>>
>>
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