fill disscusion and textmessage model

JoinTheCityREST/app/Discussion/models.py

+from django.contrib.auth.models import User
 from django.db import models
+from app.Tag.models import Tag
+from django.utils.datetime_safe import datetime
 
 
-# Create your models here.
+class TextMessage(models.Model):
+    user = models.ForeignKey(User, related_name='user_creator_of_message',
+                             blank=False, null=False, default=None)
+    text = models.CharField(max_length=1000)
+    created_at = models.DateTimeField(default=datetime.now)
 
-class Discussion(models.Model):
-    pass
+    def __str__(self):
+        return self.text
 
+class Discussion(models.Model):
+    question = models.CharField(max_length=100)
+    message = models.ManyToManyField(TextMessage, blank=True, null=True, related_name="conversations_participant")
+    tag = models.ForeignKey(Tag, related_name='place_of_discussion', blank=False, null=False, default=None)
 
-class Message(models.Model):
-    pass
+    def __str__(self):
+        return self.question

JoinTheCityREST/app/Discussion/serializers.py

 from rest_framework import serializers
-from app.Discussion.models import Discussion, Message
+from app.Discussion.models import Discussion, TextMessage
+from app.User.serializers import UserSerializer
 
 
 class DiscussionSerializer(serializers.HyperlinkedModelSerializer):
     class Meta:
         model = Discussion
-        fields = ()
-
-class MessageSerializer(serializers.HyperlinkedModelSerializer):
+        fields = ('url', 'question', 'message', 'tag')
 
+class TextMessageSerializer(serializers.HyperlinkedModelSerializer):
     class Meta:
-        model = Message
-        fields = ()
\ No newline at end of file
+        model = TextMessage
+        fields = ('url', 'user', 'text', 'created_at')
\ No newline at end of file

JoinTheCityREST/app/Discussion/views.py

 # Create your views here.
 from rest_framework import viewsets, permissions
 from app.API.serializers import APISerializer
-from app.Discussion.models import Discussion, Message
-from app.Discussion.serializers import MessageSerializer, DiscussionSerializer
+from app.Discussion.models import Discussion, TextMessage
+from app.Discussion.serializers import TextMessageSerializer, DiscussionSerializer
 
 
 class DiscussionViewSet(viewsets.ModelViewSet):
@@ -13,10 +13,10 @@ class DiscussionViewSet(viewsets.ModelViewSet):
     serializer_class = DiscussionSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
-class MessageViewSet(viewsets.ModelViewSet):
+class TextMessageViewSet(viewsets.ModelViewSet):
     """
     API for articles
     """
-    queryset = Message.objects.all()
-    serializer_class = MessageSerializer
+    queryset = TextMessage.objects.all()
+    serializer_class = TextMessageSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
\ No newline at end of file