like dislike functionality working

authors/apps/articles/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.2 on 2019-04-05 07:50
+# Generated by Django 2.2 on 2019-04-10 13:00
 
 from django.db import migrations, models
 import django.db.models.deletion
@@ -23,10 +23,22 @@ class Migration(migrations.Migration):
                 ('body', models.TextField()),
                 ('createdAt', models.DateTimeField(auto_now_add=True)),
                 ('updatedAt', models.DateTimeField(auto_now=True)),
+                ('likes', models.IntegerField(default=0)),
+                ('dislikes', models.IntegerField(default=0)),
                 ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='author', to='profiles.Profile')),
             ],
             options={
                 'get_latest_by': ['id'],
             },
         ),
+        migrations.CreateModel(
+            name='ArticleLikeDislike',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('likes', models.BooleanField(default=False, null=True)),
+                ('createdAt', models.DateTimeField(auto_now_add=True)),
+                ('article', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='articles.Article')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='profiles.Profile')),
+            ],
+        ),
     ]

authors/apps/articles/models.py

@@ -14,6 +14,10 @@ class Article(models.Model):
     author = models.ForeignKey(Profile, on_delete=models.CASCADE,
      related_name='author')
 
+    #like-dislike
+    likes = models.IntegerField(default=0)
+    dislikes = models.IntegerField(default=0)
+
     class Meta:
         get_latest_by = ['id']
 
@@ -30,4 +34,8 @@ def get_slug(title):
     def __str__(self):
         return self.title
 
-
+class ArticleLikeDislike(models.Model):
+    user = models.ForeignKey(Profile, on_delete=models.CASCADE)
+    article = models.ForeignKey(Article, on_delete=models.CASCADE)
+    likes = models.BooleanField(default=False, null=True)
+    createdAt = models.DateTimeField(auto_now_add=True)

authors/apps/articles/serializers.py

@@ -8,3 +8,13 @@ class Meta:
         fields = '__all__'
         model = models.Article
         read_only_fields = ['author','slug']
+
+class ArticleLikeDislikeSerializer(serializers.ModelSerializer):
+    class Meta:
+        fields = ["user", "article", "likes", "createdAt"]
+        model = models.ArticleLikeDislike
+        extra_kwargs = {
+            'user': {'write_only': True},
+            'article': {'write_only': True},
+        }
+        unique_together=["user", "likes"]

authors/apps/articles/urls.py

@@ -1,8 +1,9 @@
 from django.urls import path
-from .views import ListCreateArticle, RetrieveUpdateDestroyArticle
+from .views import ListCreateArticle, RetrieveUpdateDestroyArticle, ArticleLikeDislikeView
 
 app_name = "article_application"
 urlpatterns = [
     path('articles/', ListCreateArticle.as_view(), name='list-articles'),
     path('articles/<int:pk>', RetrieveUpdateDestroyArticle.as_view(), name='auth-articles'),
+    path('articles/<int:pk>/like', ArticleLikeDislikeView.as_view(), name='like-dislike'),
 ]

authors/apps/articles/views.py

@@ -1,6 +1,6 @@
 from django.shortcuts import render
 from rest_framework import generics ,status
-from .models import Article
+from .models import Article, ArticleLikeDislike
 from authors.apps.profiles.models import Profile
 from . import serializers
 from rest_framework.response import Response
@@ -42,4 +42,55 @@ class RetrieveUpdateDestroyArticle(generics.RetrieveUpdateDestroyAPIView):
     queryset = Article.objects.all()
     serializer_class = serializers.ArticleSerializer
 
-
+class ArticleLikeDislikeView(generics.GenericAPIView):
+    """
+    Article should be liked or disliked and toggle
+    """
+    permission_classes = (IsAuthenticatedOrReadOnly,)
+    serializer_class = serializers.ArticleLikeDislikeSerializer
+
+    def post(self, request, pk):
+        article = Article.objects.filter(pk=pk).first()
+        likes = request.data["likes"]
+        # querty = ArticleLikeDislike.objects.filter(article_id=article.id, 
+        #                                                 user_id=request.user.id) 
+        # liked_article = querty if querty else 
+        query = ArticleLikeDislike.objects.filter(article_id=article.id, 
+                                                        user_id=request.user.id) 
+        liked_article = query if query is not None else liked_article.update(likes=False)
+        # if liked_article:
+            #if row does not exist, create row with data below
+            #if likes == True:
+        serializer_data = self.serializer_class(data={
+            "user": request.user.id,
+            "article": article.id,
+            "likes": likes
+        })
+
+        serializer_data.is_valid(raise_exception=True)
+        serializer_data.save()
+        #data is going to be returned in the response
+
+        data = {
+            "article": article.title,
+            "username": request.user.username,
+            "details": serializer_data.data
+        }
+        # else:
+        #    #like is toggled by user when endpoint is triggered twice OR ++
+        #     value = not (liked_article.first().likes)
+        #     liked_article.update(likes=value)
+        #     data = {
+        #         "article": article.title,
+        #         "username": request.user.username,
+        #         "details": {
+        #             "likes": liked_article.first().likes,
+        #             "created_at": liked_article.first().created_at
+        #         }
+        #     }
+        # updates the number of likes and dislikes of a given article
+        likes = ArticleLikeDislike.objects.filter(article_id=article.id, likes=True)
+        dislikes = ArticleLikeDislike.objects.filter(article_id=article.id, likes=False)
+        Article.objects.filter(pk=pk).update(likes=likes.count() , dislikes=dislikes.count())
+
+        return Response(data, status=status.HTTP_200_OK)