модель
class Like(models.Model):
    like = models.BooleanField()
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, null=True, blank=True)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)

 вюха

class LikeView(View):
    model = Product

    def post(self, request, pk):
        obj = self.model.objects.get(pk=pk)
        likes = Like.objects.get(product_id=obj.id)
        try:
            if request.user.is_authenticated():
                like = Like.objects.get(user=request.user)
            elif not request.user.is_authenticated():
                like = Like.objects.get(user_ip=get_ip(request))
                if like.like:
                    like.like = False
                    like.save()
                    okay = 'False'
                elif not like.like:
                    like.like = True
                    like.save()
                    okay = 'True'
        except like.DoesNotExist:
            if not request.user.is_authenticated():
                like = Like.objects.create(user_ip=get_ip(request), liked=True)
            else:
                like = Like.objects.create(user=request.user, liked=True)
            like.save()
            okay = 'new'
        return HttpResponse(
            json.dump({
                'result': okay,
                'like': likes.count(like=True),
                })
        )
скрипт

{% extends 'base.html' %}
{% block content %}
    <div class="product_details">
        <img src="{{product.image.url}}"/>
        <button class="like" onclick="make_like()">Like</button>
        <h3>{{product.name}}</h3>
        <p class="desc">Description: <span>{{product.description}}</span></p>
        <p class="price">Price: <span>{{product.price}}</span></p>
    </div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js">
</script>
<script>
    function make_like(){
        var like = $(this)
        var pk = {{product.id}}
        var

        $.ajax({
            url : window.location.href + "/like/",
            type : 'POST',
            data : {obj: pk},

            success:function(json){
                if(json.result == 'new'){
                    $('.like').css('background','#FF0000');
                }else if(json.result == 'False'){
                    $('.like').css('background','');
                }else if(json.result == 'True'){
                    $('.like').css('background','#FF0000');
                    }
                }
            })

        }
</script>

{%endblock%}