生成多个 PDF 并压缩它们以供下载,所有这些都在一个视图中 [英] Generate multiple PDFs and zip them for download, all in a single view
问题描述
我正在使用 xhtml2pdf
在我的 Django 视图中生成 PDF.这个想法是遍历查询中存在的所有实例,然后为每个实例创建一个 PDF,然后将所有生成的 PDF 添加到一个 zip 文件中以供下载.xtml2pdf
逻辑工作正常,但循环逻辑让我头疼.
I am using xhtml2pdf
to generate PDFs in my Django View. The idea is to loop over all the instances that are there in the query, then for each instance create a PDF, then add all the generated PDFs to one zip File for download. The xtml2pdf
logic is working okay but the looping logic is what gives me headache.
到目前为止,这是我的功能:
So this is my function so far:
def bulk_cover_letter(request, ward_id, school_cat_id, cheque_number):
school_type = SchoolType.objects.get(id=school_cat_id)
schools_in_school_type = Applicant.objects.filter(
school_type=school_type, ward_id=ward_id, award_status='awarded'
).order_by().values_list('school_name', flat=True).distinct()
for school in schools_in_school_type:
beneficiaries = Applicant.objects.filter(school_type=school_type, ward_id=ward_id, award_status='awarded', school_name=school)
total_amount_to_beneficiaries = Applicant.objects.filter(school_type=school_type, ward_id=ward_id, award_status='awarded', school_name=school).aggregate(total=Sum('school_type__amount_allocated'))
context = {
'school_name' : school,
'beneficiaries' : beneficiaries,
'total_amount_to_beneficiaries' : total_amount_to_beneficiaries,
'title' : school + ' Disbursement Details',
'cheque_number': cheque_number
}
response = HttpResponse('<title>Cover Letter</title>', content_type='application/pdf')
filename = "%s.pdf" %(cheque_number)
content = "inline; filename=%s" %(filename)
response['Content-Disposition'] = content
template = get_template('cover_letter.html')
html = template.render(context)
result = io.BytesIO()
pdf = pisa.CreatePDF(
html, dest=response, link_callback=link_callback)
if not pdf.error:
# At this point I can generate a single PDF.
# But no idea on what to do next.
# The zipping logic should follow here after looping all the instances - (schools)
从那时起,我不知道下一步该做什么.任何帮助将不胜感激.
From that Point I have no idea on what to do next. Any help will be highly appreciated.
推荐答案
试试这个:
Utils.py
def render_to_pdf(template_src, context_dict={}):
template = get_template(template_src)
html = template.render(context_dict)
buffer = BytesIO()
p = pisa.pisaDocument(BytesIO(html.encode("ISO-8859-1")), buffer)
pdf = buffer.getvalue()
buffer.close()
if not p.err:
return pdf#HttpResponse(result.getvalue(), content_type='application/pdf')
return None
def generate_zip(files):
mem_zip = BytesIO()
with zipfile.ZipFile(mem_zip, mode="w",compression=zipfile.ZIP_DEFLATED) as zf:
for f in files:
zf.writestr(f[0], f[1])
return mem_zip.getvalue()
视图.py
def generate_attendance_pdf(modeladmin, request, queryset):
template_path = 'student/pdf_template.html'
files = []
for q in queryset:
context = {
'firstname': q.firstname,
'lastname': q.lastname,
'p_firstname': q.bceID.firstname
}
pdf = render_to_pdf(template_path, context)
files.append((q.firstname + ".pdf", pdf))
full_zip_in_memory = generate_zip(files)
response = HttpResponse(full_zip_in_memory, content_type='application/force-download')
response['Content-Disposition'] = 'attachment; filename="{}"'.format('attendnace.zip')
return response
显然,您必须根据需要修改上下文/名称.
Obviously, you have to modify the context/names to what you need.
归功于 -> Neil Grogan https://www.neilgrogan.com/py-bin-zip/
Credit to -> Neil Grogan https://www.neilgrogan.com/py-bin-zip/
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