add root folder for main folder

+# Generated by Django 3.0.6 on 2020-06-11 15:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='root_folder',
+            field=models.IntegerField(null=True),
+        ),
+        migrations.AlterField(
+            model_name='item',
+            name='parent',
+            field=models.IntegerField(null=True),
+        ),
+    ]

@@ -8,7 +8,7 @@ class Item(models.Model):
     file_type = models.CharField(max_length=100, null=True) # signed_url 생성을 위해 file type 세팅
     path = models.TextField()
     #parent = models.ForeignKey('Item', on_delete=models.CASCADE, null=True) #related_name
-    parent = models.IntegerField()
+    parent = models.IntegerField(null=True) # root 폴더의 경우 null임
     user_id = models.IntegerField()
     size = models.IntegerField()
     is_deleted = models.BooleanField(default = False)
@@ -37,6 +37,7 @@ class User(models.Model):
     user_id = models.CharField(max_length = 50)
     name = models.CharField(max_length = 50)
     password = models.CharField(max_length = 20)
+    root_folder = models.IntegerField(null=True)
     total_size = models.IntegerField()
     current_size = models.IntegerField()
     created_time = models.DateTimeField(auto_now=True)

@@ -13,14 +13,15 @@ from rest_framework.response import Response
 from rest_framework.decorators import action
 from rest_framework.permissions import IsAuthenticated, AllowAny
 
-from api.models import Item, SharedItem, User
-from api.serializers import UserSerializer,GroupSerializer,ItemSerializer
+from .models import Item, SharedItem, User
+from .serializers import UserSerializer,GroupSerializer,ItemSerializer
 from rest_framework import status
 from annoying.functions import get_object_or_None
 from django.conf import settings
 import jwt
 from django.http import HttpResponse, JsonResponse
 
+
 class UserViewSet(viewsets.ModelViewSet):
     """
     API endpoint that allows users to be viewed or edited.
@@ -42,11 +43,15 @@ class UserViewSet(viewsets.ModelViewSet):
         if user == None:
             user = User(user_id = user_id, name = name, password = password, total_size=100000, current_size = 0)
             user.save()
+            root = Item(is_folder=True, name="root", file_type="folder", path="", user_id=user.int_id, size=0,
+                        status=True)
+            root.save()
             return Response({
                 'message': 'user created',
                 'int_id': user.int_id,
                 'user_id': user.user_id,
                 'name': user.name,
+                'root_folder':root.item_id,
                 'total_size': user.total_size,
                 'current_size': user.current_size,
                 'created_time': user.created_time