I’m working on a project and I’m using the incredible django admin. So, yesterday I needed a way to hide some fields in a model for user that didn’t have superuser permissions. After some googling, I found a method in the ModelAdmin class that was perfect (well, I think that it’s perfect) for my needs: get_form.
The method is not really mentioned in the official django documentation except in the comment framework, but you can use it in your ModelAdmin subclass as well. It’s called before the “change form” is created, so we can dynamically change it before it’s displayed.
The principle is very simple: I dynamically populate the exclude attribute so that if a user is not a superuser I can exclude a field (or more that one field). Let’s see an example:
class MyModelAdmin(admin.ModelAdmin):
def get_form(self, request, obj=None, **kwargs):
self.exclude = []
if not request.user.is_superuser:
self.exclude.append('field_to_hide')
return super(MyModelAdmin, self).get_form(request, obj, **kwargs)What it does is simply add the field_to_hide to the exclude list of MyModelAdmin. In this case, the field will be visible only to superusers, checking the request.user.is_superuser attribute. Pretty simple!
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If you are (like me) a mac fan and you use the excellent Panic Coda to develop, you should know that is now possible to write plugins with every languages you want (if you have the interpreter installed on your system).
Python is bundled on every mac, and is also a beautiful and simple language, so i want to show how to develop a simple plugin for Coda with Python!
First of all you need to download the Coda Plug-in Creator that is the application that will convert your python script into a brand new plugin.
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In this second part of this article (this is the first part) i’m going to show you how to retreive and serialize the tree structure using jQuery and sent the serialized data to a php script (using ajax) that saves it on the database. In this way, we can have the persistence of any change made on the tree.
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I’m developing a website that have a catalog with nested categories; this categories are also ordered and with a not predefined depth levels. I needed to find a way to manage with category in a fast and intuitive way for the user, so i decided to use a directory like tree allowing the users to drag and drop the categories to change the order and even the position on the tree: of course i use jQuery to do this, and PHP/MySQL to save the structure of the tree in a database.
I found a nice tree jQuery plugin on the web, that i used as a starting point for my project: http://news.kg/wp-content/uploads/tree/. The plugin work well on all browser i tested (FF3, Safari 3, IE6, IE7). It provide the drag and drop funcionality and some interesting callback, like afterClick and afterDblClick.
But let’s start from the beginning.
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