added urls, views and serializers for challenges

Author: dvidsilva

api/urls.py

@@ -7,4 +7,5 @@
     url(admin_root_url, admin.site.urls),
     url(r'^services/api/', include('accounts.urls')),
     url(r'^services/api/', include('profile.urls')),
+    url(r'^services/api/', include('challenges.urls')),
 ]

challenges/serializers.py

@@ -0,0 +1,23 @@
+from rest_framework_json_api import serializers
+from .models import Challenge
+from accounts.models import User
+from accounts.serializers import UserSerializer
+from rest_framework_json_api.relations import ResourceRelatedField
+
+class ChallengeSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Challenge
+        fields = ('user', 'created_at', 'updated_at', 'title', 'short_title', 'owner', 'difficulty',
+            'challenge_type', 'priority', 'description', 'short_description',
+            'extra_points', 'technical_notes', 'procedure', 'code_tips')
+
+    included_serializers = {
+        'user':  UserSerializer,
+    }
+
+    user = ResourceRelatedField(
+        queryset=User.objects
+    )
+
+    class JSONAPIMeta:
+        included_resources = ['user',]

challenges/urls.py

@@ -0,0 +1,10 @@
+from django.conf.urls import url, include
+from . import views
+from rest_framework import routers
+
+router = routers.DefaultRouter(trailing_slash=False)
+router.register(r'challenges', views.ChallengesViewSet, base_name='Challenges')
+
+urlpatterns = [
+    url(r'^', include(router.urls)),
+]

challenges/views.py

@@ -1,3 +1,14 @@
-from django.shortcuts import render
+from rest_framework import viewsets
+from .models import Challenge
+from .serializers import ChallengeSerializer
 
-# Create your views here.
+class ChallengesViewSet(viewsets.ModelViewSet):
+
+    def get_queryset(self):
+        queryset = Challenge.objects.all()
+        pk = self.request.query_params.get('pk', None)
+        if pk is not None:
+            queryset = queryset.filter(pk=pk)
+        return queryset
+
+    serializer_class = ChallengeSerializer