def get_recommendation(uid):
'''
random from a 'pool' of object what is not already in 'control'
return None if cannot find one
'''
def get_unique_random(control, pool):
# loop until
while True:
# if exhausted of choices, return None
if len(pool) <= 0:
return None
# re-random
choice = random.choice(pool)
# remove the choice from pool
try:
pool.remove(choice)
except ValueError:
pass # or scream: thing not in some_list!
except AttributeError:
pass # call security, some_list not quacking like a list!
# return the choice if unique, otherwise keep looping
if (choice not in control):
return choice
recommendations = []
# --------------------------------------------
# From User Top 5
# --------------------------------------------
# choose more from higher view count category
weight = 4;
top5 = db.get_top_five_categories(uid)
logger.debug('*'* 120)
logger.debug('Selecting from User Preferences')
logger.debug('*'*120)
logger.debug('\n\r')
for cat in top5:
logger.debug('x'* 100)
logger.debug('for categories '+cat['cid'])
logger.debug('x'*100)
logger.debug('\n\r')
logger.debug('Selecting from user with rating = 0')
logger.debug('|'*60)
# this ensure we have at least one user with 0 rating for each category
products = db.queryDB2(get_product_for_cid_with_rating_condition.format(cat['cid'], '= 0'))
db.resolveProducts(products)
choice = get_unique_random(recommendations, products)
logger.debug('Choice:')
print_choice(choice)
if choice is not None:
recommendations.append(choice)
logger.debug('Recommendations:')
print_products(recommendations)
logger.debug('Selecting from user with rating > 0')
logger.debug('|'*50)
products = db.queryDB2(get_product_for_cid_with_rating_condition.format(cat['cid'], '> 0'))
db.resolveProducts(products)
logger.debug('Products:')
print_products(products)
for x in range(0,weight):
if len(products) <= 0:
break
choice = random.choice(products)
recommendations.append(choice)
# remove the choosen item so the item
# cannot appear twice in the same list
products.remove(choice)
logger.debug('Recommendations:')
print_products(recommendations)
weight -= 1
# --------------------------------------------
# Fill with Global Top 5
# --------------------------------------------
# choose more from higher view count category
if len(recommendations) < 10:
weight = 5;
global_top5 = db.get_global_top_five()
for cat in global_top5:
products = db.get_product_category(cat['cid'])
for x in range(0,weight):
choice = get_unique_random(recommendations, products)
if choice is None:
break
recommendations.append(choice)
weight -= 1
# --------------------------------------------
# Fill with Random
# --------------------------------------------
# fill remaining space with random products
# note that 'if' were used instead of 'while'
# to prevent possible infinite loop from
# exhaustion of chioce in the entire system
if len(recommendations) < 10:
products = db.get_random_product()
for x in range(0,len(recommendations)):
choice = get_unique_random(recommendations, products)
if choice is None:
break
recommendations.append(choice)
return recommendations;
def get_product_category(cid):
result = db.get_product_category(cid)
return jsonify({'result': result})