how to save the 'user' object that not used to insert it everytime you need it using django

i want to do these thing:

1.open the login_view (which is the page user login)

2.write my username and password , and put 'login' button, then submit to the login_submit view

3.in login_submit view , if your username and password are right , you will return to the homepage

4.but when i return HttpResponseRedirect("/") to the hpmeage, the homepage.html(the following code) does not has a user object

5.i have to make it like this in login_submit view:

return render_to_response('homepage.html',{'user':user})

6.that is Cumbersome , i want to use return HttpResponseRedirect("/") , so should i set a cookies that save the user , or has any other easy way to save user that not used to insert it everytime you need it .

thanks

the homepage.html is :

{% if user.is_authenticated %}
    <p>Welcome, {{ user.username }}. Thanks for logging in.</p>
{% else %}
    <p>Welcome, new user. Please <a href="/account/login_view">login</a></p>
{% endif %}

the homepage virw is :

def home(request):
    return render_to_response('homepage.html')

this is login_view :

def login_view(request): 
    if request.method == 'POST': 
        form = LoginForm(request.POST) 
        if form.is_valid():
            # Process the data in form.cleaned_data
            # ...
            return HttpResponseRedirect('/') # Redirect after POST
    else:
        form = LoginForm() # An unbound form

    return render_to_response('accounts/login_view.html',{'form': form,})

the login_view.html is :

<form action="/account/login_submit/" method="post">
    <div class="f开发者_开发技巧ieldWrapper">
        {{ field.errors }}
        {{ field.label_tag }}: {{ field }}
    </div>
    <p><input type="submit" value="login" /> or <a href="/account/register_view"><input type="button" value="register"></a></p>
</form>

and

def login_submit(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)  
        if user is not None:  
            if user.is_active:  
               login(request, user)
               return HttpResponseRedirect("/")
            else:
               return HttpResponse('user is not active')
        else:
            #return HttpResponseRedirect("/account/login_submit") 
            return HttpResponse('login error')

Context processors.