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designing a database in google app engine
create table User
(
    id int primary key identity(1,1),
    login nvarchar(50) unique not null,
    password nvarchar(50) not null,
    email nvarchar(50) unique not null,
)

create table Article
(
    userId int references User(id) not null,
    topic nvarchar(50) not null,
    content nvarchar(max) not null
)

class Article(db.Model):
     topic = db.StringProperty(multiline=False)
     content = db.StringProperty(multiline=True)

class User(db.Model):
     login = db.StringProperty()
     email = db.EmailProperty()
     password = db.StringProperty(multiline=False)
     articles = db.ListProperty(int) #here I want to do db.ListProperty(Article), but I can't. So I want to keep here id of article.

select id from User where login = 'sada' and password = 'sd'

query = db.Query(User, keys_only=True)
query.filter('login =', 'sada')
query.filter('password =', 'sd')
user_key = query.get()

db.get(user_key)

user_key = Key.from_path(User, id_or_name)