fix serializer response

suitablephones/models.py

@@ -20,7 +20,7 @@ class Camera(models.Model):
     info = models.CharField(max_length=100, null=True)
 
     def __str__(self):
-        return f" {self.flash} - {str(self.megapixel)} - {self.info}"
+        return f"{self.flash} - {str(self.megapixel)} - {self.info}"
                
 class Screen(models.Model):
     size = models.CharField(max_length=500, null=True)
@@ -31,7 +31,7 @@ class Screen(models.Model):
     technology = models.CharField(max_length=100)
     
     def __str__(self):
-        return f"{self.size_in} - {self.density} - {self.technology}"
+        return f"{str(self.size_in)} - {str(self.density)} - {str(self.technology)}"
                   
 class Device(models.Model):
     #architecture  =  models.JSONField(default=dict)

suitablephones/serializers.py

@@ -1,6 +1,6 @@
 from rest_framework import serializers
 
-from suitablephones.models import Bluetooth, Camera, Device
+from suitablephones.models import Bluetooth, Camera, Device, Screen
 
 
 class CameraSerializer(serializers.ModelSerializer):
@@ -22,6 +22,7 @@ class ScreenSerializer(serializers.ModelSerializer):
 class DeviceSerializer(serializers.ModelSerializer):
     bluetooth = BluetoothSerializer(many=False, read_only=True)
     cameras = CameraSerializer(many=True, read_only=True)
+    screen = ScreenSerializer(many=True, read_only=True)
 
     class Meta:
         model = Device