Snippet List
When you have a model containing a field that is a foreign key back to the same model, you could find yourself with a hierarchy with an infinite loop:
#Data modelling Back to the Future
> grandfather > father > son > father > ...
Using this field instead of the standard ForeignKey will ensure that no model instance is saved that has itself as an ancestor, breaking the relationship if it does.
(Enhancements: I am sure one would want to better enhance this with appropriate error handling instead of silently disconnecting the relationship. And the relevant forms ought not show ancestors in the field's widget to reduce the chances of this happening in the first place.)
- pre_save
- recursion
- loop
- foreign
Inserts the output of a view, using fully qualified view name (and then some
args), a or local Django URL.
{% view view_or_url arg[ arg2] k=v [k2=v2...] %}
This might be helpful if you are trying to do 'on-server' AJAX of page
panels. Most browsers can call back to the server to get panels of content
asynchonously, whilst others (such as mobiles that don't support AJAX very
well) can have a template that embeds the output of the URL synchronously
into the main page. Yay! Go the mobile web!
Follow standard templatetag instructions for installing.
**IMPORTANT**: the calling template must receive a context variable called
'request' containing the original HttpRequest. This means you should be OK
with permissions and other session state.
**ALSO NOTE**: that middleware is not invoked on this 'inner' view.
Example usage...
Using a view name (or something that evaluates to a view name):
{% view "mymodule.views.inner" "value" %}
{% view "mymodule.views.inner" keyword="value" %}
{% view "mymodule.views.inner" arg_expr %}
{% view "mymodule.views.inner" keyword=arg_expr %}
{% view view_expr "value" %}
{% view view_expr keyword="value" %}
{% view view_expr arg_expr %}
{% view view_expr keyword=arg_expr %}
Using a URL (or something that evaluates to a URL):
{% view "/inner" %}
{% view url_expr %}
(Note that every argument will be evaluated against context except for the
names of any keyword arguments. If you're warped enough to need evaluated
keyword names, then you're probably smart enough to add this yourself!)
- template
- ajax
- tag
- templatetag
- view
- httprequest
- mobile
- include
jamesgpearce has posted 2 snippets.