I am trying to make a web app using Django that accepts 2 inputs from the user:
- Mathematical Operator: 1 for addition, 2 for multiplication, etc.
- Number of Pages
Based on this, a math worksheet is generated and downloaded. All of this works out fine, but only once. When I try to regenerate a second PDF, I get an exception:
- KeyError at /worksheet/ ‘data’
- Request Method: POST
- Request URL: http://localhost:8000/worksheet/
- Django Version: 3.2.5 Exception
- Type: KeyError
- Exception Value: ‘data’ Exception
- Location: /Users/rishisaikia/Python
Projects/springdales/spring_env/lib/python3.9/site-packages/fpdf/fpdf.py, line 1515, in _putimages - Python Executable: /Users/rishisaikia/Python
Projects/springdales/spring_env/bin/python - Python Version: 3.9.5
- Server time: Sun, 04 Jul 2021 06:49:37 +0000
Here are my files:
views.py
from django.shortcuts import render from . import math_gen from django.http import FileResponse def index(request): return render(request, 'mathwork/index.html') def worksheet(request): if request.method =='POST': practice = request.POST["practice"] pages = request.POST["pages"] math_gen.gen_pages(int(practice), int(pages)) math_gen.pdf.output('mathwork/pdf_output/tut.pdf', 'F') # return render(request, 'mathwork/index.html') return FileResponse(open('mathwork/pdf_output/tut.pdf', 'rb'), as_attachment=True, content_type='application/pdf')
index.html
<h1>Welcome to Maths Worksheet Generator</h1> {% block content %} <form action="{% url 'mathwork:worksheet' %}" method='POST'> {% csrf_token %} <!-- <p>Select Function (1,2,3,4)</p> --> <input type="text" name='practice'> <!-- <p>Enter Number of Pages</p> --> <input type="text" name='pages'> <button name='submit'>Generate Worksheet</button> </form> {% endblock content %}
What am I doing wrong?
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Answer
I think the difference between ‘first’ and other runs is that you have your pdf file generated. I can suggest to try to remove the file before generating a new one.
filename = 'mathwork/pdf_output/tut.pdf' if os.path.isfile(filename): os.remove(filename) math_gen.pdf.output(filename, 'F')