Fungsi jalan pintas Django

The package django.shortcuts collects helper functions and classes that "span" multiple levels of MVC. In other words, these functions/classes introduce controlled coupling for convenience's sake.

render()

render(request, template_name, context=None, content_type=None, status=None, using=None)

Combines a given template with a given context dictionary and returns an HttpResponse object with that rendered text.

Django does not provide a shortcut function which returns a TemplateResponse because the constructor of TemplateResponse offers the same level of convenience as render().

Argumen dibutuhkan

request
The request object used to generate this response.
template_name
The full name of a template to use or sequence of template names. If a sequence is given, the first template that exists will be used. See the template loading documentation for more information on how templates are found.

Argumen pilihan

context
Nilai kamus untuk ditambah ke konteks cetakan. Secara awalan, ini adalah kamus kosong. Jika nilai di kamus adalah callable, tampilan akan memanggilnya sesaat sebelum membangun cetakan.
content_type
The MIME type to use for the resulting document. Defaults to 'text/html'.
status
Kode status untuk tanggapan. Awalan menjadi 200.
using
NAME dari mesin cetakan untuk digunakan untuk memuat cetakan.

Contoh

Contoh berikut membangun cetakan myapp/index.html dengan jenis MIME application/xhtml+xml:

from django.shortcuts import render

def my_view(request):
    # View code here...
    return render(request, 'myapp/index.html', {
        'foo': 'bar',
    }, content_type='application/xhtml+xml')

Contoh ini setara pada:

from django.http import HttpResponse
from django.template import loader

def my_view(request):
    # View code here...
    t = loader.get_template('myapp/index.html')
    c = {'foo': 'bar'}
    return HttpResponse(t.render(c, request), content_type='application/xhtml+xml')

redirect()

redirect(to, *args, permanent=False, **kwargs)

Mengembalikan HttpResponseRedirect ke URL yang sesuai untuk argument dilewatkan.

Argumen dapat menjadi:

  • A model: the model's get_absolute_url() function will be called.
  • A view name, possibly with arguments: reverse() will be used to reverse-resolve the name.
  • An absolute or relative URL, which will be used as-is for the redirect location.

By default issues a temporary redirect; pass permanent=True to issue a permanent redirect.

Contoh

You can use the redirect() function in a number of ways.

  1. By passing some object; that object's get_absolute_url() method will be called to figure out the redirect URL:

    from django.shortcuts import redirect

def my_view(request):
    ...
    obj = MyModel.objects.get(...)
    return redirect(obj)

  2. By passing the name of a view and optionally some positional or keyword arguments; the URL will be reverse resolved using the reverse() method:

    def my_view(request):
    ...
    return redirect('some-view-name', foo='bar')

  3. By passing a hardcoded URL to redirect to:

    def my_view(request):
    ...
    return redirect('/some/url/')

    Ini juga bekerja dengan URL penuh:

    def my_view(request):
    ...
    return redirect('https://example.com/')

By default, redirect() returns a temporary redirect. All of the above forms accept a permanent argument; if set to True a permanent redirect will be returned:

def my_view(request):
    ...
    obj = MyModel.objects.get(...)
    return redirect(obj, permanent=True)

get_object_or_404()

get_object_or_404(klass, *args, **kwargs)

Calls get() on a given model manager, but it raises Http404 instead of the model's DoesNotExist exception.

Argumen dibutuhkan

klass
A Model class, a Manager, or a QuerySet instance from which to get the object.
**kwargs
Parameter pencarian, yang harus berupa dalam bentuk diterima oleh get() dan filter().

Contoh

The following example gets the object with the primary key of 1 from MyModel:

from django.shortcuts import get_object_or_404

def my_view(request):
    obj = get_object_or_404(MyModel, pk=1)

Contoh ini setara pada:

from django.http import Http404

def my_view(request):
    try:
        obj = MyModel.objects.get(pk=1)
    except MyModel.DoesNotExist:
        raise Http404("No MyModel matches the given query.")

The most common use case is to pass a Model, as shown above. However, you can also pass a QuerySet instance:

queryset = Book.objects.filter(title__startswith='M')
get_object_or_404(queryset, pk=1)

The above example is a bit contrived since it's equivalent to doing:

get_object_or_404(Book, title__startswith='M', pk=1)

tetapi itu dapat berguna jika anda melewati variabel queryset dari tempat lain.

Akhirnya, anda dapat juga menggunakan Manager. Ini berguna untuk contoh jika anda mempunyai custom manager:

get_object_or_404(Book.dahl_objects, title='Matilda')

Anda dapat juga menggunakan related managers:

author = Author.objects.get(name='Roald Dahl')
get_object_or_404(author.book_set, title='Matilda')

Note: As with get(), a MultipleObjectsReturned exception will be raised if more than one object is found.

get_list_or_404()

get_list_or_404(klass, *args, **kwargs)

Returns the result of filter() on a given model manager cast to a list, raising Http404 if the resulting list is empty.

Argumen dibutuhkan

klass
A Model, Manager or QuerySet instance from which to get the list.
**kwargs
Parameter pencarian, yang harus berupa dalam bentuk diterima oleh get() dan filter().

Contoh

The following example gets all published objects from MyModel:

from django.shortcuts import get_list_or_404

def my_view(request):
    my_objects = get_list_or_404(MyModel, published=True)

Contoh ini setara pada:

from django.http import Http404

def my_view(request):
    my_objects = list(MyModel.objects.filter(published=True))
    if not my_objects:
        raise Http404("No MyModel matches the given query.")
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