def simulate(
self,
num_users: int = _DEFAULT_USER_COUNT,
min_num_movies: int = _DEFAULT_MIN_MOVIES_PER_USER,
max_num_movies: int = _DEFAULT_MAX_MOVIES_PER_USER) -> 'State':
self._validate_params(num_users, min_num_movies, max_num_movies)
users = []
reviews = []
num_movies = len(self._movies)
upper_bound = min(max_num_movies or num_movies, num_movies)
population = list(range(0, num_movies))
now = datetime.utcnow().timestamp()
for i in range(num_users):
username = _rand_string(1, 4)
# Hash the password. We use method='plain' here to save time.
password = generate_password_hash(_rand_string(1, 1),
method='plain')
user = User(username, password)
# Pick n distinct movies
movies = [
self._movies[idx] for idx in sample(
population, randint(min_num_movies, upper_bound))
]
# Add those movies to the user's watchlist
for movie in movies:
user.add_to_watchlist(movie)
# Watch a random number of movies on the user's watchlist
for j in range(randint(0, user.watchlist_size())):
user.watch_movie(movies[j])
# Review a random number of the movies the user watched
for j in range(randint(0, len(user.watched_movies))):
movie = movies[j]
review_text = _rand_string(spaces=True)
rating = randint(1, 10)
release_date = datetime(movie.release_date, 1, 1).timestamp()
delta = randint(
0, int(now - release_date)
) # float -> int will be lossy but not a big deal here
delta += random() # Add a random number of milliseconds
timestamp = datetime.fromtimestamp(now - delta)
review = Review(movie, review_text, rating, timestamp, user)
user.add_review(review)
reviews.append(review)
users.append(user)
return self.State(users, reviews)
def add_movie_to_watchlist(self, user: User, movie: Movie) -> None:
with self._session_cm as scm:
user.add_to_watchlist(movie)
scm.session.commit()
def add_movie_to_watchlist(self, user: User, movie: Movie) -> None:
user.add_to_watchlist(movie)