diff --git a/src/account/models.py b/src/account/models.py
index 86d7d416cd4d7106054a8c6650c4fab8ba19dc38..cf691e659397d0194849d1b5fdaa03eddcc93cf8 100644
--- a/src/account/models.py
+++ b/src/account/models.py
@@ -2,9 +2,22 @@ from django.db import models
 from django.contrib.auth.models import User
 
 
+
+
 class Profile(models.Model):
     join_date = models.DateField(auto_now=True)
     user = models.OneToOneField(User, on_delete=models.CASCADE)
+
+    nick = models.CharField(max_length=15, blank=True, null=True)
+    signed = models.BooleanField(default=False, null=False)
+    # Homeworks=models.ForeignKey(Homework)
+
+    def __str__(self):
+        return self.user.username
+
+
+
+class GroupChoice(models.Model):
     TEAMS = (
         ('DT', 'DevTeam'),
         ('NET', 'NeTeam'),
@@ -14,9 +27,7 @@ class Profile(models.Model):
         ('N', 'None'),
     )
     pref_group = models.CharField(max_length=10, choices=TEAMS, default='None')
-    nick = models.CharField(max_length=15, blank=True, null=True)
-    signed = models.BooleanField(default=False, null=False)
-    # Homeworks=models.ForeignKey(Homework)
+    profile =  models.ForeignKey(Profile, related_name="preferd_groups")
 
-    def __str__(self):
-        return self.user.username
+    class Meta:
+        unique_together = ('pref_group', 'profile')
\ No newline at end of file
diff --git a/src/account/serializers.py b/src/account/serializers.py
index 41b44386d7fe3aaefeee4677391bde7f70f9fdc2..f359cf0ffce7cff02a1d622168794e2ff5d52909 100644
--- a/src/account/serializers.py
+++ b/src/account/serializers.py
@@ -1,12 +1,20 @@
 from rest_framework import serializers
-from account.models import Profile
+from account import models
 from django.contrib.auth.models import User
 
 
+class ChoiceSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = models.GroupChoice
+
+
+
 class ProfileSerializer(serializers.ModelSerializer):
+    preferd_groups = ChoiceSerializer(many=True, read_only=True)
+
     class Meta:
-        model = Profile
-        fields = '__all__'
+        model = models.Profile
+        fields = serializers.ALL_FIELDS
 
 
 class ProfileCreateSerializer(serializers.ModelSerializer):
@@ -19,7 +27,7 @@ class ProfileCreateSerializer(serializers.ModelSerializer):
     email = serializers.EmailField()
 
     class Meta:
-        model = Profile
+        model = models.Profile
         fields = [
                 'first_name',
                 'last_name',
@@ -39,7 +47,7 @@ class ProfileCreateSerializer(serializers.ModelSerializer):
             nick = validated_data['nick']
             pref_group = validated_data['pref_group']
             signed = validated_data['signed']
-            profile_obj = Profile(
+            profile_obj = models.Profile(
                     user=user,
                     nick=nick,
                     pref_group=pref_group,
@@ -61,7 +69,7 @@ class ProfileUpdateSerializer(serializers.ModelSerializer):
     email = serializers.EmailField()
 
     class Meta:
-        model = Profile
+        model = models.Profile
         fields = [
                 'first_name',
                 'last_name',
@@ -78,7 +86,7 @@ class ProfileUpdateSerializer(serializers.ModelSerializer):
         user.save()
         nick = validated_data['nick']
         pref_group = validated_data['pref_group']
-        profile_obj = Profile(
+        profile_obj = models.Profile(
                 user=user,
                 nick=nick,
                 pref_group=pref_group,
@@ -96,7 +104,7 @@ class ProfileDetailSerializer(serializers.ModelSerializer):
     email = serializers.SerializerMethodField()
 
     class Meta:
-        model = Profile
+        model = models.Profile
         fields = [
                 'first_name',
                 'last_name',