# Τεκμηρίωση του Django - 1.10.7

# Django shortcut functions

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()`.

### Required arguments

`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.

### Optional arguments

`context`
  A dictionary of values to add to the template context. By default, this is an empty dictionary. If a value in the dictionary is callable, the view will call it just before rendering the template.
`content_type`
  The MIME type to use for the resulting document. Defaults to the value of the `DEFAULT_CONTENT_TYPE` setting.
`status`
  The status code for the response. Defaults to `200`.
`using`
  The `NAME` of a template engine to use for loading the template.

### Example

The following example renders the template `myapp/index.html` with the MIME type 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')

This example is equivalent to:

    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')

## `render_to_response()`

`render_to_response`(template_name, context=None, content_type=None, status=None, using=None)

  This function preceded the introduction of `render()` and works similarly except that it doesn’t make the `request` available in the response. It’s not recommended and is likely to be deprecated in the future.

## `redirect()`

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

  Returns an `HttpResponseRedirect` to the appropriate URL for the arguments passed.

  The arguments could be:

  - 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.

### Examples

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):
           ...
           object = MyModel.objects.get(...)
           return redirect(object)

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/')

   This also works with full URLs:

       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):
        ...
        object = MyModel.objects.get(...)
        return redirect(object, 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.

### Required arguments

`klass`
  A `Model` class, a `Manager`, or a `QuerySet` instance from which to get the object.
`**kwargs`
  Lookup parameters, which should be in the format accepted by `get()` and `filter()`.

### Example

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):
        my_object = get_object_or_404(MyModel, pk=1)

This example is equivalent to:

    from django.http import Http404

    def my_view(request):
        try:
            my_object = 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)

but it can be useful if you are passed the `queryset` variable from somewhere else.

Finally, you can also use a `Manager`. This is useful for example if you have a custom manager:

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

You can also use `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.

### Required arguments

`klass`
  A `Model`, `Manager` or `QuerySet` instance from which to get the list.
`**kwargs`
  Lookup parameters, which should be in the format accepted by `get()` and `filter()`.

### Example

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)

This example is equivalent to:

    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.")