From the [docs][1]:

&gt; The Django Admin application defines a number of customized widgets for calendars, filtered selections, and so on. These widgets define media requirements, and the Django Admin uses the custom widgets in place of the Django defaults. The Admin templates will only include those media files that are required to render the widgets on any given page.
&gt;
&gt;If you like the widgets that the Django Admin application uses, feel free to use them in your own application! They’re all stored in django.contrib.admin.widgets.

In this case, you want the `FilteredSelectMultiple` widget. To use it, apply the widget on a form field like so:

    my_field = forms.ModelMultipleChoiceField(queryset=MyModel.objects.all(), widget=FilteredSelectMultiple(&quot;verbose name&quot;, is_stacked=False))

Make sure to include the forms `media` in the template as it needs to include a few JS files.

   [1]: http://docs.djangoproject.com/en/dev/topics/forms/media/

I&#39;m currently using a Cache Manifest (as described [here][1]). This effectively makes the necessary resources to run the application available when the user is offline. 

Unfortunately, it works a little too well. 

After the cache manifest is loaded, Firefox 3.5+ caches all of the resources explicitly referenced in the cache manifest. However, if a file on the server is updated and the user tries force-refreshing the page while online (including the cache-manifest itself), Firefox will absolutely refuse to fetch anything. The application remains completely frozen at the last point it was cached. Questions:

  1. I want Firefox to effectively only rely on the cached resources when the network connection fails. I&#39;ve tried using the FALLBACK block, but to no avail. Is this even possible?
  2. If #1 is not possible, is it possible for the user to force-refresh a page and bypass this cache (ctrl-F5 doesn&#39;t do it and neither does clearing the browser&#39;s cache, shockingly) short of clearing their private data? Alternatively, does the cache-manifest mechanism support expiry headers and is its behavior with respect to this documented anywhere?


  [1]: https://developer.mozilla.org/en/Offline_resources_in_Firefox

How to properly invalidate an HTML5 Cache Manifest for online/offline web apps?

Given a function object or name, how can I determine its arity? Something like `(arity func-name)` .

I hope there is a way, since arity is pretty central in Clojure

Clojure: How to find out the arity of function at runtime?

The Django admin site makes use of a really cool widget:

![enter image description here][1]

How can I make use of this widget in my own applications? I don&#39;t see anything like that [listed here][2].


  [1]: http://i.stack.imgur.com/ybe24.png
  [2]: http://docs.djangoproject.com/en/dev/ref/forms/widgets/#ref-forms-widgets

Django multi-select widget?

The Django admin site makes use of a really cool widget:
<img src="http://i.stack.imgur.com/ybe24.png" alt="enter image description here">
How can I make use of this widget in my own applications? I don't see anything like that <a href="http://docs.djangoproject.com/en/dev/ref/forms/widgets/#ref-forms-widgets" target="_blank" rel="noopener noreferrer">listed here</a>.

I am getting an array `arr` passed to my Django template. I want to access individual elements of the array in the array (e.g. `arr[0]`, `arr[1]`) etc. instead of looping through the whole array.

Is there a way to do that in a Django template?

How to access array elements in a Django template?

I&#39;m using Django with [FastCGI][1] + nginx. Where are the logs (errors) stored in this case?

  [1]: https://en.wikipedia.org/wiki/FastCGI



Where can I find the error logs of nginx, using FastCGI and Django?

In my core.html I have a block labeled javascript.  It would be great if I can append more lines to this block without overwriting everything in it.



Can we append to a {% block %} rather than overwrite?

For Django 1.1.

I have this in my models.py:

    class User(models.Model):
        created = models.DateTimeField(auto_now_add=True)
        modified = models.DateTimeField(auto_now=True)

When updating a row I get:

    [Sun Nov 15 02:18:12 2009] [error] /home/ptarjan/projects/twitter-meme/django/db/backends/mysql/base.py:84: Warning: Column &#39;created&#39; cannot be null
    [Sun Nov 15 02:18:12 2009] [error]   return self.cursor.execute(query, args)

The relevant part of my database is:

      `created` datetime NOT NULL,
      `modified` datetime NOT NULL,

Is this cause for concern?

Side question: in my admin tool, those two fields aren&#39;t showing up. Is that expected?


Django auto_now and auto_now_add

What is the best location to put templates in django project?

There is no way to have a tri-state check button (yes, no, null) in HTML, right?

Are there any simple tricks or work-arounds without having to render the whole thing by oneself?

Tri-state Check box in HTML?

I&#39;ve got a load of checkboxes that are checked by default. My users will probably uncheck a few (if any) of the checkboxes and leave the rest checked.  

Is there any way to make the form POST the checkboxes that are **not** checked, rather than the ones that **are** checked?

POST unchecked HTML checkboxes

I am looking for the neatest way to create an HTML form which does not have a submit button. That itself is easy enough, but I also need to stop the form from reloading itself when submission-like things are done (for example, hitting &lt;kbd&gt;Enter&lt;/kbd&gt; in a text field).

form with no action and where enter does not reload page

I&#39;m trying to change the form action based on the selected value from a dropdown menu.

Basically, the HTML looks like this:

    &lt;form class=&quot;search-form&quot; id=&quot;search-form&quot; method=&quot;post&quot; accept-charset=&quot;UTF-8&quot; action=&quot;/search/user&quot;&gt;
    &lt;select id=&quot;selectsearch&quot; class=&quot;form-select&quot; name=&quot;selectsearch&quot;&gt;
    &lt;option value=&quot;people&quot;&gt;Search people&lt;/option&gt;
    &lt;option value=&quot;node&quot;&gt;Search content&lt;/option&gt;
    &lt;/select&gt;
    
    &lt;label&gt;Enter your keywords: &lt;/label&gt;
     &lt;input type=&quot;text&quot; class=&quot;form-text&quot; value=&quot;&quot; size=&quot;40&quot; id=&quot;edit-keys&quot; name=&quot;keys&quot; maxlength=&quot;255&quot; /&gt;
    
    &lt;input type=&quot;submit&quot; class=&quot;form-submit&quot; value=&quot;Search&quot; id=&quot;edit-submit&quot; name=&quot;search&quot;/&gt;
    &lt;/form&gt;

If &quot;people&quot; is selected, (which it is by default), the action should be &quot;/search/user&quot;, and if content is selected, the action should be &quot;/search/content&quot;

I&#39;m still searching around, but haven&#39;t been able to find out how to do this. 



JavaScript: how to change form action attribute value based on selection?

I have a form with name `orderproductForm` and an undefined number of inputs.

I want to do some kind of jQuery.get or ajax or anything like that that would call a page through Ajax, and send along all the inputs of the form `orderproductForm`.

I suppose one way would be to do something like

    jQuery.get(&quot;myurl&quot;,
              {action : document.orderproductForm.action.value,
    	       cartproductid : document.orderproductForm.cartproductid.value,
    	       productid : document.orderproductForm.productid.value,
               ...

However I do not know exactly all the form inputs. Is there a feature, function or something that would just send ALL the form inputs?

jQuery AJAX submit form

Trying to use a very simple form to upload a file into a new class instance. I am expecting to have both files in `request.FILES` but it&#39;s empty. I am on the bundled dev server.

Been stuck here and went through all related questions.

    wayfinder_map.media_file = request.FILES[&#39;media_file&#39;] 

generates

&gt; MultiValueDictKeyError: &quot;Key &#39;media_file&#39; not found in MultiValueDict:
&gt; {}&gt;&quot;

**model**

    class WayfinderMap(models.Model):
        &quot;&quot;&quot; Way-finding Map Config&quot;&quot;&quot;
    
    
        media_file = models.FileField(upload_to=&quot;maps&quot;, null=True, blank=True) 
        wall_file = models.FileField(upload_to=&quot;maps_data&quot;, null=True, blank=True) 
**view**

    @login_required
    def create_map(request, form_class=WayfinderMapForm, template_name=&quot;wayfinder/map/create.html&quot;):
    wayfinder_map_form = form_class(request.user, request.POST or None, request.FILES)
    
        if wayfinder_map_form.is_valid():
            wayfinder_map = wayfinder_map_form.save(commit=False)
            wayfinder_map.media_file = request.FILES[&#39;media_file&#39;]
            wayfinder_map.data_file = request.FILES[&#39;data_file&#39;]
            wayfinder_map.creator = request.user
            wayfinder_map.save()
        return HttpResponseRedirect(wayfinder_map.get_absolute_url())
    
    return render_to_response(template_name, {
        &quot;wayfinder_map_form&quot;: wayfinder_map_form,
    }, context_instance=RequestContext(request))

**template**

    &lt;form enctype=&quot;multipart/form-data&quot; class=&quot;uniForm&quot; id=&quot;wayfinder_map_form&quot; method=&quot;POST&quot; action=&quot;&quot;&gt;
            &lt;fieldset class=&quot;inlineLabels&quot;&gt;
                {{ wayfinder_map_form|as_uni_form }}
                &lt;div class=&quot;form_block&quot;&gt;
                    &lt;input type=&quot;hidden&quot; name=&quot;action&quot; value=&quot;create&quot; /&gt;
                    &lt;input type=&quot;submit&quot; value=&quot;{% trans &#39;create&#39; %}&quot;/&gt;
                &lt;/div&gt;
            &lt;/fieldset&gt;
        &lt;/form&gt;

Empty Request.FILES with Django Upload forms

Consider the following models and form:

    class Pizza(models.Model):
        name = models.CharField(max_length=50)
    
    class Topping(models.Model):
        name = models.CharField(max_length=50)
        ison = models.ManyToManyField(Pizza, blank=True)
    
    class ToppingForm(forms.ModelForm):
        class Meta:
            model = Topping


When you view the ToppingForm it lets you choose what pizzas the toppings go on and everything is just dandy.

My questions is: How do I define a ModelForm for Pizza that lets me take advantage of the Many-to-Many relationship between Pizza and Topping and lets me choose what Toppings go on the Pizza?




Django ModelForm for Many-to-Many fields

Could anyone explain to me similarities and differences of Django&#39;s `forms.Form` &amp; `forms.ModelForm`?

Django&#39;s forms.Form vs forms.ModelForm

The [Django docs][1] only list examples for overriding `save()` and `delete()`. However, I&#39;d like to define some extra processing for my models **only when they are created**. For anyone familiar with Rails, it would be the equivalent to creating a `:before_create` filter. Is this possible?


  [1]: http://docs.djangoproject.com/en/dev/topics/db/models/#overriding-predefined-model-methods

Django - Overriding the Model.create() method?

Hi I have an array of checkboxes e.g.

    &lt;input type=&quot;checkbox&quot; name=&quot;checks[]&quot; value=&quot;1&quot; /&gt;
    &lt;input type=&quot;checkbox&quot; name=&quot;checks[]&quot; value=&quot;2&quot; /&gt;
    &lt;input type=&quot;checkbox&quot; name=&quot;checks[]&quot; value=&quot;3&quot; /&gt;
    &lt;input type=&quot;checkbox&quot; name=&quot;checks[]&quot; value=&quot;4&quot; /&gt;

How do I access these in the view.py if more than one is selected?

I have tried 

    request.POST[&#39;checks&#39;]

but that only gives me the last value.  What I want is all the ones that have been selected in a list e.g. 1,3,4

Thanks

Content Type	Original Author	Original Content on Stackoverflow
Question	mpen	View Question on Stackoverflow
Solution 1 - Django	Bartek	View Answer on Stackoverflow

Django multi-select widget?

Django Problem Overview

Django Solutions

Solution 1 - Django

Clojure: How to find out the arity of function at runtime?

How to properly invalidate an HTML5 Cache Manifest for online/offline web apps?

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