我想做的基本上是:
- 从URL获取PDF
- 通过pdfrw修改它
- 将其作为BytesIO对象存储在内存中
- 通过
Model.objects.create(form=pdf_file, name="Some name")
上传到Django FileField
create()
方法运行时,它保存了所有字段,除了form
。import io
import tempfile
from contextlib import contextmanager
import requests
import pdfrw
@contextmanager
def as_file(url):
with tempfile.NamedTemporaryFile(suffix='.pdf') as tfile:
tfile.write(requests.get(url).content)
tfile.flush()
yield tfile.name
def write_fillable_pdf(input_pdf_path, output_pdf_path, data_dict):
template_pdf = pdfrw.PdfReader(input_pdf_path)
## PDF is modified here
buf = io.BytesIO()
print(buf.getbuffer().nbytes). # Prints "0"!
pdfrw.PdfWriter().write(buf, template_pdf)
buf.seek(0)
return buf
views.py
from django.core.files import File
class FormView(View):
def get(self, request, *args, **kwargs):
form_url = 'http://some-pdf-url.com'
with as_file(form_url) as temp_form_path:
submitted_form = write_fillable_pdf(temp_form_path, temp_form_path, {"name": "John Doe"})
print(submitted_form.getbuffer().nbytes). # Prints "994782"!
FilledPDF.objects.create(form=File(submitted_form), name="Test PDF")
return render(request, 'index.html', {})
正如您所看到的,print()
在填充 BytesIO 时会给出两个不同的值,这让我认为增加的大小意味着实际上有数据。是否有原因导致它没有正确保存到我的 Django 模型实例中?另外,如果有人知道更有效的方法,请告诉我!