diff --git a/api/urls.py b/api/urls.py
index 6c12ad3..5a4356b 100644
--- a/api/urls.py
+++ b/api/urls.py
@@ -14,6 +14,7 @@ router.register(r'logs', LogViewSet)
 router.register(r'usersapi', UserViewSet)
 router.register(r'users', views.LoginViewset)
 router.register(r'subjects', views.SubjectViewset)
+router.register(r'participants', views.ParticipantsViewset)
 
 urlpatterns = [
 	#API REST
diff --git a/api/views.py b/api/views.py
index a56b0eb..1d13de0 100644
--- a/api/views.py
+++ b/api/views.py
@@ -2,11 +2,14 @@ import requests, json
 from django.shortcuts import get_object_or_404, reverse
 from django.contrib.auth import authenticate
 from django.views.decorators.csrf import csrf_exempt
+
 from rest_framework import viewsets
 from rest_framework.response import Response
 from rest_framework.decorators import detail_route, list_route
 from rest_framework.permissions import IsAuthenticated, IsAuthenticatedOrReadOnly
 
+from django.db.models import Q
+
 from security.models import Security
 
 from subjects.serializers import SubjectSerializer
@@ -139,4 +142,42 @@ class SubjectViewset(viewsets.ReadOnlyModelViewSet):
 
 			response = json.dumps(sub_info)
 
+		return HttpResponse(response)
+
+class ParticipantsViewset(viewsets.ReadOnlyModelViewSet):
+	queryset = User.objects.all()
+	permissions_classes = (IsAuthenticated, )
+
+	@csrf_exempt
+	@list_route(methods = ['POST'], permissions_classes = [IsAuthenticated])
+	def get_participants(self, request):
+		username = request.data['email']
+		subject_slug = request.data['subject_slug']
+
+		participants = None
+
+		response = ""
+
+		if not subject_slug == "":
+			participants = User.objects.filter(Q(is_staff = True) | Q(subject_student__slug = subject_slug) | Q(professors__slug = subject_slug) | Q(coordinators__subject_category__slug = subject_slug)).exclude(email = username).distinct()
+
+			serializer = UserSerializer(participants, many = True)
+
+			json_r = json.dumps(serializer.data)
+			json_r = json.loads(json_r)
+			
+			info = {}
+
+			info["data"] = {}
+			info["data"]["participants"] = json_r
+
+			info["message"] = ""
+			info["type"] = ""
+			info["title"] = ""
+			info["success"] = True
+			info["number"] = 1
+			info['extra'] = 0
+
+			response = json.dumps(info)
+
 		return HttpResponse(response)
\ No newline at end of file
diff --git a/subjects/serializers.py b/subjects/serializers.py
index 5ecdf54..4e80c9f 100644
--- a/subjects/serializers.py
+++ b/subjects/serializers.py
@@ -26,8 +26,7 @@ class TagSerializer(serializers.ModelSerializer):
 		validators = []
 
 class SubjectSerializer(serializers.ModelSerializer):
-	participants = UserSerializer(many = True, source = 'get_participants')
-
+	
 	class Meta:
 		model = Subject
-		fields = ["name", "slug", "visible", "participants"]
\ No newline at end of file
+		fields = ["name", "slug", "visible"]
\ No newline at end of file
diff --git a/users/serializers.py b/users/serializers.py
index 932f99a..6e0c928 100644
--- a/users/serializers.py
+++ b/users/serializers.py
@@ -60,5 +60,5 @@ class UserBackupSerializer(serializers.ModelSerializer):
 class UserSerializer(serializers.ModelSerializer):
 	class Meta:
 		model = User
-		fields = ('username','email','image','last_update','date_created','last_name','social_name',
+		fields = ('username','email','image_url','last_update','date_created','last_name','social_name',
 			'is_staff','is_active','description')
--
libgit2 0.21.2