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Tagging System

Author:
macmichael01
Posted:
February 7, 2008
Language:
Python
Version:
.96
Tags:
tag django python tags tagging tagger
Score:
4 (after 4 ratings)

This is my personal tagging system that I have created. It is intended to be used for multiple applications. This tagging system also has a build in tag cloud that will generate based on the most frequently used tags that you have used or based on the number of clicks users have clicked on a particular tag.

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## Middleware.py
from tags.models import Tag
# must have a url expression similar to the one below in order to use this
# (r'^tags/(?P<tag>[-\w]+)/$','show_view'),

class TagClicksMiddleware(object):
    """
    This middleware class increments the
	number of times that a user clicks on a particular tag
    """
    def process_response(self, request, response):
        # this is kinda hackish but it works.
        try:
            tag_url = request.META['PATH_INFO'].split('/tags/')
            tag_url = tag_url[1][:-1]
            tags = Tag.objects.get(slug__exact=tag_url)
            tags.clicks = tags.clicks + 1
            tags.save() 
        except:
            return response
        return response

## models.py

from django.db import models
from django.contrib.contenttypes.models import ContentType

class Tag(models.Model):
    """
    This is the table that holds our tag names associated with our blog
    """
    name = models.CharField(max_length=25)
    slug = models.SlugField(prepopulate_from=('name',))
    clicks = models.IntegerField(null=True, default=0)
    content_type = models.ForeignKey(ContentType,)
    
    class Meta:
        db_table = 'tags'
        verbose_name = 'tag'
        verbose_name_plural = 'tags'
        
    class Admin:
        fields = (
            ('Tag Form', {
                'fields': ('name', 'slug', 'content_type')
            }),
        )

        list_display = ('name', 'clicks', 'content_type')
        list_filter = ('content_type',)
        search_fields = ['name', 'content_type']
        ordering = ['name']

    def get_absolute_url(self):
        """Returns the associated tag URl"""
        return "/%s/tags/%s/" % (self.content_type.app_label,self.slug)
        
    def __str__(self):
        return '%s' % self.name

## tag_processor.py

from django.db.models import get_model
from tags.models import Tag
 
def tag_cloud_processor(model_name, buckets=4, base_font_size=8,cloud_size=12):
    """
    Tag cloud processor returns the most used tags for a particular application.
    """
    if model_name:
        try:
            tag_list = Tag.objects.filter(content_type__app_label__exact=model_name)[:cloud_size]
        except:
            tag_list = None
        tag_range = []
        thresholds = []
        tags = []
        if tag_list:
            for tag in tag_list:
                tag_range.append(float(getattr(tag, model_name).count()))
            max_tag = max(tag_range) or None
            min_tag = min(tag_range) or None
            if max_tag and min_tag:
                delta = (max_tag - min_tag) / float(buckets)
                for i in range(1,buckets + 1):
                    thresh_value = min_tag + i * delta
                    thresholds.append(thresh_value)
                for tag in tag_list:
                    for bucket in range(1,buckets + 1):
                        if float(getattr(tag, model_name).count()) <= thresholds[bucket]:
                            tags.append({"tag":tag, "font_size":(base_font_size + bucket * 2)})
                            break
                return tags
            else:
                return []
        else:
            return []
    else:
        return []


# must have a url expression similar to the one below in order to use this function
# (r'^tags/(?P<tag>[-\w]+)/$','show_view'),

def popular_tag_cloud(buckets=4, base_font_size=8,cloud_size=12):
    """
    Tag cloud processor that returns a list of the top tags that users have clicked.
    """
    try:
        tag_clicks = Tag.objects.filter(clicks__gte=1).order_by('clicks')[:cloud_size]
        tag_filter = [tag.clicks for tag in tag_clicks]
        tag_list = Tag.objects.filter(clicks__in=tag_filter)[:cloud_size]
    except:
        tag_list = None
    tag_range = []
    thresholds = []
    tags = []
    if tag_list:
        for tag in tag_list:
            tag_range.append(float(tag.clicks))
        max_tag = max(tag_range) or None
        min_tag = min(tag_range) or None
        if max_tag and min_tag:
            delta = (max_tag - min_tag) / float(buckets)
            for i in range(1, buckets + 1):
                thresh_value = min_tag + i * delta
                thresholds.append(thresh_value)
            for tag in tag_list:
                for bucket in range(1, buckets + 1):
                    if tag.clicks <= thresholds[bucket]:
                        tags.append({"tag":tag, "font_size":(base_font_size + bucket * 2)})
                        break
            return tags
        else:
            return []
    else:
        return []

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Comments

ubernostrum (on February 7, 2008):

Wouldn't it be easier just to use django-tagging?

#

macmichael01 (on February 7, 2008):

nah

#

FlashingPumpkin (on May 20, 2008):

hi

could you provide maybe some more info on the exact usage of that snippet?

i've saved all the files, packed them into the installed apps in settings.py and an appropriate menue in the admin interface shows up too, but.. how can i tag now specific entries of a blog?

i tried by adding a

from project.tag.models import Tag

to my own models.py and a

tag = Tag()

in my class, doesn't show effect.

and adding tags doesn't work either. there's the form with name, slug and content type, but all combinations just throw "Please correct the error below." :¦

#

macmichael01 (on May 21, 2008):

You should add a m2m field into you model that you are trying to relate it to. I did not code a TagField() so you cannot use tag = Tag().

So do something similar to this:

tags = models.ManyToManyField('Tag', limit_choices_to={'content_type__app_label': 'SOME_APP_NAME'}, null=True, blank=True)

#

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