Programmer blog

Django 1.5 changed. The url tag syntax from {% url  my_page %} into {% url "my_page" %} . Now all my templates should be changed accordingly to migrate to 1.5. You could do it with executing this command in your bash shell. Assuming you are in the project folder. Assuming you have version control, or do know how to backup your work ;). Some people claim it is unsafe. But you may want to make it safer with adding '{%' to the beginning of the string. To make sure only templates arre changed. Or either execute this only in your templates folder to be sure. $ find . - type f - print0 | xargs - 0 sed - i 's/ url \([^" >][^ >]*\)/ url "\1"/g' And one person did a django snippet for this operation. You may also find it useful.  http://djangosnippets.org/snippets/2905/

Continuing those series of tasty features in Django 1.4. It's templates and newly added templatetags this time. Many things improved in template logic now. Lets move on point by point... Tag  {% elif %} For most of us it is almost killer feature of new Django 1.4. You will have simpler logic in your templates, if you have advanced logic there, of course. ;) Key-value arguments for user tags You can use key-value for tags along with old, positional, arguments, e.g.: { % custom_tag 123 "test" thing . var text = msg | upper username = user . get_full_name % } All of this implemented using common "args" and "kwargs": @register . simple_tag def custom_tag ( a , b , * args , * * kwargs ) : warning = kwargs [ 'text' ] profile = kwargs [ 'username' ] . . . return . . . assignment_tag Some tags are not built to output something in template, like simple_tag. They only have to change something in c...

Sometimes you have the task to decorate django form fields. In our case it was need to add different widget to form field depending on field type. You can know your field type by refering to it's python class name, e.g.: field . __class__ . __name__ You will get wrong symbols error if you try to refer this python variable in templates directly. So you need a custom template tag to serve here. Decision was not to return variable for tag but to add context variable, cause I had need to perform exact actions on certain field types. So tag example: @register . simple_tag ( takes_context = True ) def set_this_field_type ( context , field ) : """     Adds to context given field type variable     variable named "this_field_type"     """ context [ "this_field_type" ] = field . field . __class__ . __name__ return '' Now you can add this variable to your if statements. E.g. usage: {% ...

Upon development proces you often meet ManyToMany relations that throw errors in templates. I prefer to feed everything to context and play with it there. This kind of error appears when you iterate through a model's ManyToMany field. To fix it just add a related 'all' manager through dot syntax. Like so: Model: class BannerImage ( models . Model ) : image = models . ImageField ( upload_to = "somedir" ) def get_image_url ( self ) : return 'Image url here' class Banner ( models . Model ) : name = models . CharField ( max_length = 250 , null = True ) images = models . ManyToManyField ( BannerImage ) View/Tag or else, that creates context: banner = get_object_or_404 ( Banner , pk = 1 ) return { 'banner' : banner , } Template causing the error: {% for image in banner . images %} < img src = "{{ image.get_image_url }}" /> {% endfor %} Template without the error: {% ...

After successful developing python back-end for Sebastian Tschan jQuey Plugin  I've decided to make a reusable app for that purpose. So: This is a plugin, made using multiupload form from Sebastian Tschan. It uses jQuey UI and jQuery instead of Flash uploader. On Django side it uses sorl-thumbnails and PIL. You can use it in your applications with simple inclusion tag jQuery Features it has: Multiple file upload: Allows to select multiple files at once and upload them simultaneously. Drag & Drop support: Allows to upload files by dragging them from your desktop or filemanager and dropping them on your browser window. Upload progress bar: Shows a progress bar indicating the upload progress for individual files and for all uploads combined. Cancelable uploads: Individual file uploads can be canceled to stop the upload progress. Resumable uploads: Aborted uploads can be resumed wi...