I have these models:
KindOfTea(models.Model):
name = models.CharField(max_length=100, unique=True)
description = models.TextField()
Person(models.Model):
name = models.CharField(max_length=100, unique=True)
likes = models.ManyToManyField(KindOfTea, related_name='liked_by')
I have 1 Person object and some related KindOfTea objects he likes.
With this information I want to know which other new kinds of tea he
would like. What I want to do is to get the other Person objects that
like the same kinds of tea as this person and obtain all the other
kinds of tea they like ordered by how many of them like the same one.
For example:
=========
Peter likes black tea and white tea
Laura likes black tea, green tea and red tea
Paul likes black tea, green tea and red tea
John likes black tea, green tea and yellow tea
To recommend Peter a new kind of tea I get the other persons that like
"black tea" and/or "white tea": Laura, Paul and John. Then I get
somehow the kinds of tea they like that are different than 'black tea'
and 'white tea' (the kinds of tea Peter likes) and for them I store
how many of those persons like them. So somehow I get a dictionary
that looks like this:
other_people_like = { 'green tea' : 3, 'red tea' : 2, 'yellow tea':
1 } And I can recommend Peter those kinds of tea in that order.
I have started with this:
=================
from sets import Set
p = Person.objects.get(name='Peter')
other_people = Set([])
for tea in p.likes.all():
for person in tea.liked_by.exclude(name='Peter')
other_people.add(person)
# now I have a Set with the people that like some or at least one kind
of tea Peter likes too. now how should I do the rest?
Thank you.
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