Question

I am starting to use Django and while I have read the book and googled away I am afraid that I am not making the connection on some concepts to be able to resolve this.

I need to show several values corresponding to particular companies. The user first selects three companies to compare and then the response shows the data for those companies.

In my view, I create the querysets that I iterate in my template to show the data as follows:

VIEWS EXCERPT:

        C1 = form.cleaned_data['Company1']
        C2 = form.cleaned_data['Company2']
        C3 = form.cleaned_data['Company3']

        company_names = [C1,C2,C3]

        company1 = (Company_stats.objects.filter(period__exact=P, company_name__exact=C1))
        company2 = (Company_stats.objects.filter(period__exact=P, company_name__exact=C2))
        company3 = (Company_stats.objects.filter(period__exact=P, company_name__exact=C3))

        company_list = [company1,company2,company3]

TEMPLATE EXCERPT:

  {%for c in company_list%}    
     {%for z in c %}
        {{ z.company_name }}
        {{ z.nxt_m_ret_est }}    
        {{ z.nxt_m_ret_rat }}
     {% endfor %}  
  {% endfor %}

This works – however, as I have many more moving parts (I have simplified the view for the purpose of my question) it turns into an endless laundry list of querysets – I am 100% sure this is not DRY (in spite of the laundry reference 😉 Not to mention the length of the context.

I would really appreciate it if someone could help me learn to do this in the proper way. Thank you very much in advance!

Answer 1

Try this:

companies = ['Company1', 'Company2', 'Company3']

company_names = [form.cleaned_data[c] for c in companies]

company_list = Company_stats.objects.filter(
    period__exact=P, 
    company_name__in=company_names
)

Even if this doesn’t exactly fit your need, something similar should work.