Enhanced version of snippet [1113](http://djangosnippets.org/snippets/1113/)
Usage example (not self-contained):
@register.tag
def groupurl(parser, token):
'''
Syntax::
{% groupurl view_name group [key=val, [key=val, ...]] [as varname] %}
Example::
<a href="{% groupurl blog_detail group slug=blog.slug %}">{{ blog.name }}</a>
'''
bits = token.contents.split()
tag_name = bits[0]
if len(bits) < 3:
raise template.TemplateSyntaxError("'%s' takes tag at least 2 arguments (path to a view and a group)" % (tag_name,)
bits_iter = iter(bits[1:])
# view_name + group and url kwargs
args, kwargs = parse_args_and_kwargs(parser, bits_iter, stop_test='as', tagname=tag_name)
if len(args) != 2:
raise template.TemplateSyntaxError("'%s' takes exactly two non-kwargs (path to a view and a group)" % (tag_name,))
view_name, group = args
# as var
asvar = None
for bit in bits_iter:
asvar = bit
return GroupURLNode(view_name, group, kwargs, asvar)
- tag
- templatetag
- parse
- args
- kwargs
There are several snippets that provide a basic caching decorator for functions and methods (e.g. #202, #1130, etc.). The `Cacheable` class in this snippet extends them by (*if you don't see an unordered list below, the Markdown on this site is still broken...*):
- Specifying how cache keys are determined in one of two general, flexible ways.
- Exposing a few extra methods for (re)setting and deleting the cached value transparently. Given these methods, cache key management should follow DRY: keys are specified once (and only once) at instantiation time, without having to be repeated at later interactions with the cache.
- Adding a variant for cacheable properties.
Unlike some other snippets, the way cache keys are generated must be explicitly specified by the client; there is no automagic key generation for arbitrary `func(*args, **kwds)` calls (but can be added if desired). The reason is that all usual serialization approaches (`func.__name__`/`func.__module__`, `repr`, `pickle`, etc.) are generally fragile, unsafe, inefficient or all of the above. Explicit is better than implicit in this case.
Okay - so I came across a really annoying problem earlier, where I wasn't able to *easily* load a formwizard as a segment into an existing view, and wrap it using my existing site template layouts. This was *REALLY* annoying. Especially since I wanted to keep as much of a 'overall' templating and application logic in the views.py (and just leave the forms.py to handle the form and its own templating for the form pages)
I spent about 2 hours trying to make this as conventional as possible, and finally came up with a solution. The result is something which looks as similar to the usual functionality. This also meant that there is seperation between form styling and overall site styling, so your forms can be used between multiple sites, and if your overall site template uses extends, then the context support keeps this nicely in order.
This also allows you to initialise the formwizard in a nicer way.. Of course, in each file, you'll need to import the necessary bits (like importing the testform from the view etc)
- requestcontext
- views
- context
- form
- urls.py
- wizard
- formwizard
- views.py
Django administration provides three buttons for submitting the currently edited object. Each of them has a unique name and depending on the name that is sent to the server, the specific action is performed. I see this as an ugly solution and prefer to have a choice field in the form which would render as submit buttons with different values. Then the values would be checked instead of the names. Therefore, I created the `MultipleSubmitButton` widget. When `<input type="submit" value="Go" />` is used, the value sent to the server always matches the text on the button, but if `<button type="submit" value="go">Go</button>`, the value and the human representation might differ.
To use the `MultipleSubmitButton` widget, pass it to the widget parameter of a `ChoiceField` like this:
SUBMIT_CHOICES = (
('save', _("Save")),
('save-add', _("Save and Add Another")),
)
class TestForm(forms.Form):
do = forms.ChoiceField(
widget=MultipleSubmitButton,
choices=SUBMIT_CHOICES,
)
When you print `{{ form.do }}` in the template, the following HTML will be rendered:
<ul>
<li><button type="submit" name="do" value="save">Save</button></li>
<li><button type="submit" name="do" value="save-add">Save and Add Another</button></li>
</ul>
When you submit this form and check the validity of it, `form.cleaned_data['do']` will return "save" or "save-add" depending on the submit button clicked.