Take a look at the docs for aggregation and annotation and using F expressions in them. I just skimmed over your email, but there might be something useful to learn there.
https://docs.djangoproject.com/en/dev/topics/db/aggregation/ https://docs.djangoproject.com/en/dev/ref/models/queries/#f-expressions Also, is there a reason why you're not using class based views? https://docs.djangoproject.com/en/dev/topics/class-based-views/ Cheers, AT On Sat, Nov 23, 2013 at 8:12 PM, Pepsodent Cola <pepsodentc...@gmail.com>wrote: > I worked some more on James' hint: articles[0].num_publications() > > And I followed some tutorial exercises on making Template filters. After > seeing DJ-Tom's hint. > > And this is as far as I got from trying things... > I'm trying to send two lists to my template so I can do some parallel > iteration in my forloop. > But then I realized that *type(articles)* is a Queryset and not a list so > I can't use zip() like in the examples I'm reading. > > So how can I integrate my list > *publicists_coverage* = [] # List 3 > into this forloop template code? > {% for row in *articles* %} > > > > #_______________________________________________________________________________ > > def index(request): > publications = Publication.objects.all() > > # sum_publications = Publication.objects.filter(article__pk=1).count() > > # List 1 > *articles* = > Article.objects.all().annotate(num_publications=Count('publications')) > #>>> type(articles) > #<class 'django.db.models.query.QuerySet'> > > # 3 > publication_per_article = [] # List 2 > for i in range(articles.count()): > x = articles[i].num_publications > publication_per_article.append(x) > > # 5 > total_publicists = Publication.objects.all().count() > > # Calculate things! > *publicists_coverage* = [] # List 3 > for row in publication_per_article: > y = float(row)/total_publicists > publicists_coverage.append(y) > > ziplist = zip(articles, publicists_coverage) > context = {'publications':publications, 'articles':articles, > 'total_publicists':total_publicists, 'ziplist':ziplist} > # context = {'publications':publications, > # 'total_publicists':total_publicists, 'ziplist':ziplist} > return render(request, 'magazine/index.html', context) > > #_______________________________________________________________________________ > > {% if *articles* and ziplist %} > <table border="1"> > <tr> > <th>Article id</th> > <th>Article</th> > <th>Publication</th> > <th>Publicists coverage (%)</th> > </tr> > {% for row in *articles* %} > <tr> > <td>{{ row.id }}</td> > <td>{{ row.headline }}</td> > <td>{{ row.num_publications }}</td> > <td>({{ row.num_publications }} / {{ total_publicists }}) = {{ > publicists_coverage }}x %</td> > </tr> > {% endfor %} > </table> > {% else %} > <p>No Articles or Ziplist are available.</p> > {% endif %} > > > > > > > > > On Wednesday, November 20, 2013 10:29:24 PM UTC+1, Pepsodent Cola wrote: > >> 1.) >> How do I use mathematical calculations on my forloop Article/Publication >> list? >> >> * I have attached a screenshot with the table field that I'm working on >> *"Publicists >> coverage (%)"*. >> * Admin user/pass = joe/joe >> * I have also attached my project files so that you can see things for >> yourselves. >> >> >> 2.) >> Is the solution I'm working with in "Index View page" the correct >> practice to do my mathematical calculations? >> >> #___________________________________________________________ >> ____________________ >> >> def index(request): >> publications = Publication.objects.all() >> >> >> # sum_publications = Publication.objects.filter( >> article__pk=1).count() >> articles = Article.objects.all().annotate(num_publications= >> Count('publications')) >> * #articles_int = int(articles)* >> >> * sum_publicists = Publication.objects.all().count()* >> >> * #publicists_coverage = articles/sum_publicists* >> >> >> # context = {'publications':publications, 'sum_publicists':sum_ >> publicists, >> # 'publicists_coverage':publicists_coverage, >> 'articles':articles} >> context = {'publications':publications, 'sum_publicists':sum_ >> publicists, >> 'articles':articles} >> return render(request, 'magazine/index.html', context) >> #___________________________________________________________ >> ____________________ >> >> <article> >> <h1>How many Publications was each Article in?</h1> >> >> {% if articles %} >> <table border="1"> >> <tr> >> <th>Article id</th> >> <th>Article</th> >> <th>Publication</th> >> * <th>Publicists coverage (%)</th>* >> </tr> >> {% for row in articles %} >> <tr> >> <td>{{ >> row.id<http://www.google.com/url?q=http%3A%2F%2Frow.id&sa=D&sntz=1&usg=AFQjCNGG971NtAwWsaCVNskfLhyoY4rmew>}}</td> >> <td>{{ row.headline }}</td> >> <td>{{ row.num_publications }}</td> >> <td>(*{{ row.num_publications }} / {{ sum_publicists }}*) = x >> %</td> >> </tr> >> {% endfor %} >> </table> >> {% else %} >> <p>No Articles are available.</p> >> {% endif %} >> >> <hr> >> </article> >> >> #___________________________________________________________ >> ____________________ >> >> >> 3.) >> When I try to convert articles object into int it doesn't work. Am I >> going the wrong direction when thinking about solving things like this? >> >> >> Exception Type: TypeError >> Exception Value: *int() argument must be a string or a number, not >> 'QuerySet'* >> Exception Location: /home/linux/Django/ManyToMany/magazine/views.py in >> index, line 17 >> >> >> >>> articles = Article.objects.all().annotate(num_publications= >> Count('publications')) >> >>> type(articles) >> <class 'django.db.models.query.QuerySet'> >> >>> >> >>> *articles_int = int(articles)* >> Traceback (most recent call last): >> File "<console>", line 1, in <module> >> TypeError: int() argument must be a string or a number, not 'QuerySet' >> >>> >> >> >> >> >> >> >> -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-users+unsubscr...@googlegroups.com. > To post to this group, send email to django-users@googlegroups.com. > Visit this group at http://groups.google.com/group/django-users. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/f961e7ed-99ef-4c3f-93f8-233a60211dd6%40googlegroups.com > . > > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Django users" group. 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