diff --git a/portfolios/models.py b/portfolios/models.py
index f66ec11..d80dc3a 100644
--- a/portfolios/models.py
+++ b/portfolios/models.py
@@ -2,7 +2,7 @@ from django.db import models
 
 from common.models.baseModels import BaseModel
 
-from common.utils.fileManager import dynamic_upload_to
+from common.utils.fileManager import DynamicUploadTo
 
 from django.contrib.postgres.fields import ArrayField
 from django.conf import settings
@@ -10,6 +10,8 @@ from django.conf import settings
 from users.models import User
 
 
+NICKNAME_LEN = 20
+
 class Portfolio(BaseModel):
     title = models.CharField(max_length=20)
     category = ArrayField(models.CharField(max_length=20), default=list)
@@ -18,8 +20,9 @@ class Portfolio(BaseModel):
     like_count = models.IntegerField(default=0)
     scrap_count = models.IntegerField(default=0)
     is_represent = models.BooleanField(default=False)
-    thumbnail = models.ImageField(upload_to=dynamic_upload_to('portfolio', lambda instance: 'thumbnail'), blank=True)
-    code_id = models.CharField(max_length=26, blank=True)
+    now_worker = models.CharField(max_length=NICKNAME_LEN, blank=True)
+    thumbnail = models.ImageField(upload_to=DynamicUploadTo("portfolio", "thumbnail"), null=True, blank=True)
+    code_id = models.CharField(max_length=26, null=True, blank=True)
     owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='owned_portfolios', to_field="id")
     likers = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='liked_portfolios', blank=True)
     scrappers = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='scrapped_portfolios', blank=True)
diff --git a/projects/models.py b/projects/models.py
index d03f375..246ece8 100644
--- a/projects/models.py
+++ b/projects/models.py
@@ -3,7 +3,7 @@ from django.db import models
 from common.models.baseModels import BaseModel
 from common.models.choiceModels import InvitationStatus
 
-from common.utils.fileManager import dynamic_upload_to
+from common.utils.fileManager import DynamicUploadTo
 
 from django.contrib.postgres.fields import ArrayField
 from django.conf import settings
@@ -12,6 +12,8 @@ from notifications.models import Notification
 from users.models import User
 
 
+NICKNAME_LEN = 20
+
 class Project(BaseModel):
     title = models.CharField(max_length=20)
     is_team = models.BooleanField(default=False)
@@ -22,8 +24,9 @@ class Project(BaseModel):
     like_count = models.IntegerField(default=0)
     scrap_count = models.IntegerField(default=0)
     is_represent = models.BooleanField(default=False)
-    thumbnail = models.ImageField(upload_to=dynamic_upload_to('project', lambda instance: 'thumbnail'), blank=True)
-    code_id = models.CharField(max_length=26, blank=True)
+    now_worker = models.CharField(max_length=NICKNAME_LEN, blank=True)
+    thumbnail = models.ImageField(upload_to=DynamicUploadTo("project", "thumbnail"), null=True, blank=True)
+    code_id = models.CharField(max_length=26, null=True, blank=True)
     owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='owned_projects', to_field="id")
     likers = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='liked_projects', blank=True)
     scrappers = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='scrapped_projects', blank=True)