Closed feature/#33_serializar_usuarios

-from django.contrib.auth.tokens import default_token_generator
-from rest_framework import mixins, viewsets, status
 from rest_framework.decorators import action
+from django_filters.rest_framework import DjangoFilterBackend
+from rest_framework import mixins, viewsets, status, filters
 from rest_framework.exceptions import ValidationError
 from rest_framework.parsers import JSONParser
 from rest_framework.permissions import IsAuthenticated, AllowAny
 from rest_framework.response import Response
 
+from core.permissions import CustomModelPermissions
 from usuario.models import Usuario
-from usuario.serializers import UsuarioSerializer, CambiarClaveSecretaSerializer
+from usuario.serializers import UsuarioSerializer, CambiarClaveSecretaSerializer, UsuarioListaSerializer
+from usuario.filters import UsuarioFilter
 
 
-class UsuarioViewSet(mixins.RetrieveModelMixin, mixins.UpdateModelMixin, viewsets.GenericViewSet):
+class UsuarioViewSet(mixins.RetrieveModelMixin, mixins.ListModelMixin, mixins.UpdateModelMixin,
+                     viewsets.GenericViewSet):
     queryset = Usuario.objects.all()
     permission_classes = (IsAuthenticated,)
     serializer_class = UsuarioSerializer
+    filter_backends = (DjangoFilterBackend, filters.OrderingFilter)
+    filterset_class = UsuarioFilter
+    ordering_fields = ('last_name', 'first_name', 'cuil')
+    ordering = ('last_name',)
 
     def get_object(self, base_method=False):
         user = self.request.user
@@ -22,6 +29,22 @@ class UsuarioViewSet(mixins.RetrieveModelMixin, mixins.UpdateModelMixin, viewset
 
         return user
 
+    def get_serializer_class(self):
+        if self.action == 'list':
+            return UsuarioListaSerializer
+
+        return self.serializer_class
+
+    def get_permissions(self):
+        """
+        Instantiates and returns the list of permissions that this view requires.
+        """
+        permission_classes = self.permission_classes
+        if self.action == 'list':
+            permission_classes = [CustomModelPermissions]
+
+        return [permission() for permission in permission_classes]
+
     @action(
         methods=('patch',),
         detail=False,

+from django_filters import rest_framework as filters
+
+from .models import Usuario
+
+
+class UsuarioFilter(filters.FilterSet):
+    class Meta:
+        model = Usuario
+        fields = ('last_name',)
+
+    last_name = filters.CharFilter(field_name='last_name', lookup_expr='icontains')
+

@@ -28,6 +28,17 @@ class UsuarioSerializer(serializers.ModelSerializer):
     }
 
 
+class UsuarioListaSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Usuario
+        fields = (
+            'username',
+            'first_name',
+            'last_name',
+            'cuil',
+        )
+
+
 class CambiarClaveSecretaSerializer(DRFSerializer):
     clave = serializers.CharField(max_length=128, write_only=True, required=True)
     clave_nueva = serializers.CharField(max_length=128, write_only=True, required=True)