Simple for loop in django view which creates a pdf file

Question

It seems to be a very easy problem but I can not manage it :(

I have a view which should create for me a pdf file. I need there a loop and I don't know why it doesn't work. I need to print all of list's questions. I have checked and I have 3 questions in "pytanie" list but my loop print me only one question (last question)

for i in range(len(pytanie)):
    p = canvas.Canvas(response)
    p.drawString(10, 800, ' '+ pytanie[i].title)

The whole code in this view

from reportlab.pdfgen import canvas
from django.http import HttpResponse
from reportlab.graphics.shapes import Drawing 
from reportlab.graphics.barcode.qr import QrCodeWidget 
from reportlab.graphics import renderPDF
from django.contrib.auth.models import User
from pytania.models import Pytanie


def test_qr(request):
    # Create the HttpResponse object with the appropriate PDF headers.
    response = HttpResponse(content_type='application/pdf')
    response['Content-Disposition'] = 'attachment; filename="egzamin.pdf"'

    pytanie = Pytanie.objects.all()

    for i in range(len(pytanie)):
        p = canvas.Canvas(response)
        p.drawString(10, 800, ' '+ pytanie[i].title)        


    qrw = QrCodeWidget('a') 
    b = qrw.getBounds()

    w=b[2]-b[0] 
    h=b[3]-b[1] 

    d = Drawing(200,200,transform=[200./w,0,0,200./h,0,0]) 
    d.add(qrw)

    renderPDF.draw(d, p, 1, 1)

    p.showPage()
    p.save()
    return response

wardk · Accepted Answer · 2015-01-31 14:26:03Z

2

You should just loop over Pytanie.objects.all():

Put the initialization of p outside the loop

p = canvas.Canvas(response)
for pytanie in Pytanie.objects.all():        
    p.drawString(10, 800, ' '+ pytanie.title)

edited Jan 31, 2015 at 14:26

answered Jan 31, 2015 at 14:18

wardk

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2 Comments

Anna K Over a year ago

I still get only the last question in my pdf :(

wardk Over a year ago

ah, i see now, you constantly reinitialize p

catavaran · Accepted Answer · 2015-01-31 14:31:27Z

1

I think you should change coordinates of the string:

p = canvas.Canvas(response)
for i, pytanie in enumerate(Pytanie.objects.all()):
    p.drawString(10, 800 + i*10, ' '+ pytanie.title)

answered Jan 31, 2015 at 14:31

catavaran

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