防止多次提交表单-django [英] prevent a form to be submitted multiple times - django

问题描述

我正在提交表格.在那之后，我正在做 HttpResponseRedirect ，这样，如果我刷新页面，就不会提交表单.但是，如果我在浏览器中返回并再次提交表单，该表单将被保存多次.我该如何预防呢?

I am submitting a form. After that i am doing HttpResponseRedirect so that the form wont be submitted if one i refresh the page. BUT, if i go back in browser and submit the form again, the form will be saved multiple times. How can i prevent this?

我想到了会话，这意味着我设置了这样的会话名称:

I thought of session, meaning i set a session name like this:

if request.session.get('saved', False):
    return HttpResponseRedirect('/already_saved/')    
entry.save() # <-- pseudo save
request.session['saved'] = True

但这会导致用户在实际会话中永远无法在我的页面中发送其他表单.

but this causes that the user can never send another form in my page in his actual session.

如何为每个表单创建唯一的会话，以使一个表单不会多次提交，但仍然可以提交另一表单?

how can I create unique sessions for each form, so that one form doesnot get submitted multiple times but it is still possible to submit another forms?

推荐答案

一种方法是对表单字段进行哈希处理，当服务器收到请求时，您检查表单哈希是否已经存在(例如，表单已经存在)提交).像这样:

An approach would be making a hash of the form's field and when the server receives the request you check if the hash of the form is already there (e.g. form already submitted). Something like this:

import hashlib
from django.shortcuts import Http404
sha512 = hashlib.sha512()
sha512.update(form_fields_stringfied)

if not request.session['forbidden_data']:
    request.session['forbidden_data'] = []

hashed_form = sha512.hexdigest()
if hashed_form not in request.session['forbidden_data']:
    request.session['forbidden_data'].append(hashed_form)
else:
    raise Http404

其中hashed_form是连接的表单数据，或者是您喜欢的表单数据

where hashed_form is the form data concatenated or in anyway you like

因此，不会提交任何被认为相等的两种形式

thus, no two forms considered equal will ever be submitted

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