app/django/shortcuts/__init__.py
author Todd Larsen <tlarsen@google.com>
Mon, 27 Oct 2008 19:19:44 +0000
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permissions -rw-r--r--
Add tooltips style display of help_text, instead of widening the form with another (often ridiculously large) column. Also, version the .css and .js files so that browsers won't display the wrong cached one when we change something. Patch by: Dmitri Gaskin, Todd Larsen Review by: Todd Larsen
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"""
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This module collects helper functions and classes that "span" multiple levels
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of MVC. In other words, these functions/classes introduce controlled coupling
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for convenience's sake.
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"""
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from django.template import loader
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from django.http import HttpResponse, Http404
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from django.db.models.manager import Manager
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from django.db.models.query import QuerySet
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def render_to_response(*args, **kwargs):
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    """
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    Returns a HttpResponse whose content is filled with the result of calling
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    django.template.loader.render_to_string() with the passed arguments.
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    """
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    httpresponse_kwargs = {'mimetype': kwargs.pop('mimetype', None)}
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    return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
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def _get_queryset(klass):
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    """
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    Returns a QuerySet from a Model, Manager, or QuerySet. Created to make
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    get_object_or_404 and get_list_or_404 more DRY.
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    """
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    if isinstance(klass, QuerySet):
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        return klass
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    elif isinstance(klass, Manager):
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        manager = klass
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    else:
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        manager = klass._default_manager
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    return manager.all()
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def get_object_or_404(klass, *args, **kwargs):
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    """
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    Uses get() to return an object, or raises a Http404 exception if the object
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    does not exist.
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    klass may be a Model, Manager, or QuerySet object. All other passed
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    arguments and keyword arguments are used in the get() query.
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    Note: Like with get(), an MultipleObjectsReturned will be raised if more than one
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    object is found.
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    """
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    queryset = _get_queryset(klass)
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    try:
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        return queryset.get(*args, **kwargs)
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    except queryset.model.DoesNotExist:
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        raise Http404('No %s matches the given query.' % queryset.model._meta.object_name)
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def get_list_or_404(klass, *args, **kwargs):
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    """
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    Uses filter() to return a list of objects, or raise a Http404 exception if
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    the list is empty.
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    klass may be a Model, Manager, or QuerySet object. All other passed
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    arguments and keyword arguments are used in the filter() query.
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    """
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    queryset = _get_queryset(klass)
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    obj_list = list(queryset.filter(*args, **kwargs))
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    if not obj_list:
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        raise Http404('No %s matches the given query.' % queryset.model._meta.object_name)
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    return obj_list