implement copy item api

+# Generated by Django 3.0.6 on 2020-06-10 11:50
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0004_auto_20200606_0824'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='item',
+            name='item_id',
+            field=models.IntegerField(auto_created=True, primary_key=True, serialize=False),
+        ),
+    ]

+# Generated by Django 3.0.6 on 2020-06-10 12:09
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0005_auto_20200610_1150'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='item',
+            name='item_id',
+            field=models.AutoField(primary_key=True, serialize=False),
+        ),
+    ]

+# Generated by Django 3.0.6 on 2020-06-10 12:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0006_auto_20200610_1209'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='item',
+            name='updated_time',
+            field=models.DateTimeField(null=True),
+        ),
+    ]

@@ -2,7 +2,7 @@ from django.db import models
 
 # Create your models here.
 class Item(models.Model):
-    item_id = models.IntegerField(primary_key = True)
+    item_id = models.AutoField(primary_key = True)
     is_folder = models.BooleanField(default = False)
     name = models.CharField(max_length = 50)
     path = models.TextField()
@@ -12,7 +12,7 @@ class Item(models.Model):
     size = models.IntegerField()
     is_deleted = models.BooleanField(default = False)
     created_time = models.DateTimeField(auto_now=True)
-    updated_time = models.DateTimeField()
+    updated_time = models.DateTimeField(null=True)
     status = models.BooleanField()
 
     #file = models.FileField(upload_to = \path)

 import mimetypes
 import json
 import os
+from datetime import datetime
+
 import boto3
 
 from django.contrib.auth.models import User
@@ -83,6 +85,8 @@ class ItemViewSet(viewsets.ViewSet):
             parent = get_object_or_None(Item, item_id=parent_id)
             if parent != None and parent.is_folder == True:
                 child = get_object_or_None(Item, item_id=pk)
+                if child == None:
+                    return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)
                 child.parent = parent_id
                 child.save()
                 child = Item.objects.filter(item_id = pk)
@@ -96,12 +100,41 @@ class ItemViewSet(viewsets.ViewSet):
                 res['parentInfo'] = json_parent
                 return Response({'data': res}, status=status.HTTP_200_OK)
             if parent == None:
-                return Response({'message': 'item is not existed.'}, status=status.HTTP_200_OK)
+                return Response({'message': 'parent is not existed.'}, status=status.HTTP_200_OK)
             if parent.is_folder == False:
-                return Response({'message': 'item is not folder.'}, status=status.HTTP_200_OK)
+                return Response({'message': 'parent is not folder.'}, status=status.HTTP_200_OK)
             return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)
 
-
+    @action(methods=['POST'], detail=True, permission_classes=[AllowAny], url_path='copy', url_name='copy')
+    def copy(self, request, pk):
+        if request.method == 'POST':
+            parent_id = request.POST.get('parent', '')
+            parent = get_object_or_None(Item, item_id=parent_id)
+            if parent != None and parent.is_folder == True:
+                child = get_object_or_None(Item, item_id=pk)
+                if child == None:
+                    return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)
+                if child.is_folder == True:
+                    return Response({'message': 'item is folder'}, status=status.HTTP_204_NO_CONTENT)
+                copiedName = child.name + "_복사본_" + str(datetime.now().strftime('%Y-%m-%d %H:%M'))
+                copiedItem = Item(is_folder = False, name = copiedName, path =child.path, parent = parent_id, user_id= child.user_id, size=child.size, status=child.status)
+                copiedItem.save()
+
+                copiedItem = Item.objects.filter(name = copiedName)
+                copied_data = serializers.serialize("json", copiedItem)
+                json_data = json.loads(copied_data)
+                res = json_data[0]['fields']
+                res['id'] = json_data[0]['pk']
+                parent = Item.objects.filter(item_id = parent_id)
+                parent_data = serializers.serialize("json", parent)
+                json_parent = json.loads(parent_data)[0]['fields']
+                res['parentInfo'] = json_parent
+                return Response({'data': res}, status=status.HTTP_200_OK)
+            if parent == None:
+                return Response({'message': 'parent is not existed.'}, status=status.HTTP_200_OK)
+            if parent.is_folder == False:
+                return Response({'message': 'parent is not folder.'}, status=status.HTTP_200_OK)
+            return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)
 
     def get_permissions(self):
         try:

@@ -32,5 +32,6 @@ urlpatterns = [
     url(r'^search/$', views.ItemViewSet.search, name='search'),
     url(r'^<int:pk>/share/$', views.SharedItemViewSet.share, name='share'),
     url(r'^<int:pk>/move/$', views.ItemViewSet.move, name='move'),
+    url(r'^<int:pk>/copy/$', views.ItemViewSet.copy, name='copy'),
 
 ]