request.method ==“POST”在Django中意味着什么?

时间:2013-10-02 07:48:18

标签: django

我在我的观点中使用了这个东西但是我想知道究竟是什么意思?当我们写request.method ==“GET”或“POST”

时会发生什么

3 个答案:

答案 0 :(得分:25)

request.method == "POST"的结果是布尔值 - True如果来自用户的当前请求是使用HTTP“POST”方法执行的,则为False(通常这意味着HTTP) “GET”,但也有其他方法)。

您可以阅读有关GET和POST in answers to the question Alasadir pointed you to之间差异的更多信息。简而言之,POST请求通常用于表单提交 - 如果处理表单会改变服务器端状态(例如,在注册表单的情况下将用户添加到数据库),则需要它们。 GET用于正常的HTTP请求(例如,当您在浏览器中键入URL时)以及可以在没有任何副作用的情况下处理的表单(例如搜索表单)。

代码通常用于条件语句,以区分处理提交表单的代码和显示未绑定表单的代码:

if request.method == "POST":
    # HTTP Method POST. That means the form was submitted by a user
    # and we can find her filled out answers using the request.POST QueryDict
else:
    # Normal GET Request (most likely).
    # We should probably display the form, so it can be filled
    # out by the user and submitted. 

这是另一个使用Django Forms库的示例taken straight from Django documentation

from django.shortcuts import render
from django.http import HttpResponseRedirect

def contact(request):
    if request.method == 'POST': # If the form has been submitted...
        form = ContactForm(request.POST) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
            # Process the data in form.cleaned_data
            # ...
            return HttpResponseRedirect('/thanks/') # Redirect after POST
    else:
        form = ContactForm() # An unbound form

    return render(request, 'contact.html', {
        'form': form,
    })

答案 1 :(得分:10)

request.method返回请求方法的类型GET,POST,PUT,DELETE 等。 返回后,你将它与你的字符串进行比较。 比较运算符始终提供布尔值(True or False)。

有时我们需要根据请求的方法类型处理功能。

if request.method == "GET":
    # functionality 1
elif request.method == "POST":
    # functionality 2
elif request.method == "PUT":
    # functionality 3
elif request.method == "DELETE":
    # functionality 4

请求方法GET数据与url一起传递。 for request方法POST数据在body内传递。在安全方法方面,类型POST是更好的方法。

答案 2 :(得分:-1)

book_id = Book.objects.get(id=id) 如果 request.method == 'POST':

    book_save == BookForm(request.POST, request.FILES, instance=book_id)
    if book_save.is_valid():

        book_save.save()

else:
    book_save = BookForm(instance=book_id)

y = {
    'form':book_save,
}

return render(request, 'pages/update.html', y)