My Own Like Button: Django + Ajax -- How?

I will give you an example. You just learn from it and make changes accordingly.

myapp.models.py (simplified company model):

from django.db import models
from django.contrib.auth.models import User
from django.template.defaultfilters import slugify


class Company(models.Model):
    name = models.CharField(max_length=255)
    slug = models.SlugField()
    likes = models.ManyToManyField(User, related_name='likes')

    @property
    def total_likes(self):
        """
        Likes for the company
        :return: Integer: Likes for the company
        """
        return self.likes.count()

    def save(self, *args, **kwargs):
        self.slug = slugify(self.name)
        super(Company, self).save(*args, **kwargs)

myapp.urls.py (URL for a view):

url(r'^like/$', 'myapp.views.like', name='like'),

myapp.views.py (View):

from django.http import HttpResponse
try:
    from django.utils import simplejson as json
except ImportError:
    import json
from django.shortcuts import get_object_or_404
from django.contrib.auth.decorators import login_required
from django.views.decorators.http import require_POST

from myapp.models import Company


@login_required
@require_POST
def like(request):
    if request.method == 'POST':
        user = request.user
        slug = request.POST.get('slug', None)
        company = get_object_or_404(Company, slug=slug)

        if company.likes.filter(id=user.id).exists():
            # user has already liked this company
            # remove like/user
            company.likes.remove(user)
            message = 'You disliked this'
        else:
            # add a new like for a company
            company.likes.add(user)
            message = 'You liked this'

    ctx = {'likes_count': company.total_likes, 'message': message}
    # use mimetype instead of content_type if django < 5
    return HttpResponse(json.dumps(ctx), content_type='application/json')

The template:

<input type="button" id="like" name="{{ company_slug }}" value="Like" />

<script>
$('#like').click(function(){
      $.ajax({
               type: "POST",
               url: "{% url 'like' %}",
               data: {'slug': $(this).attr('name'), 'csrfmiddlewaretoken': '{{ csrf_token }}'},
               dataType: "json",
               success: function(response) {
                      alert(response.message);
                      alert('Company likes count is now ' + response.likes_count);
                },
                error: function(rs, e) {
                       alert(rs.responseText);
                }
          }); 
    })
</script>

Some instructions for using The url tag in template:

If Django < 1.3 use url tag without quotes around URL name like this {% url like %}
If Django > 1.3 and < 1.5 then you should add {% load url from future %} at top level of your template and enclosed your URL name with quotes as I have done in my answer
If Django >= 1.5 then simply remove {% load url from future %} and enclosed URL name with quotes as {% load url from future %} is marked as to be deprecated and will be removed in Django 1.9

Writing this here since I don't have enough reputation to comment and edits have to be at least 6 characters. In new versions of Django, you need to pass the path to the view function or the name of the url to the url template tag as a string. Therefore line 7 of above template would be:

url: "{% url 'like' %}",

Here is the part of the documentation that backs this up.

My Own Like Button: Django + Ajax -- How?

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