file attechment for ticket

backend/ticket/models.py

@@ -3,6 +3,22 @@ from account.models import User
 from order.models import OrderModel
 from django_jalali.db import models as jmodels
 
+
+
+class Attachment(models.Model):
+    file = models.FileField(upload_to='attachments')
+    created_at = models.DateTimeField(auto_now_add=True)
+    size = models.PositiveIntegerField(null=True, blank=True)
+    name = models.CharField(max_length=400, null=True, blank=True)
+    def __str__(self):
+        return self.file.name
+
+    def save(self, *args, **kwargs):
+        if self.file:
+            self.size = self.file.size
+            self.name = self.file.name
+        super(Attachment, self).save(*args, **kwargs)
+
 class Ticket(models.Model):
     objects = jmodels.jManager()
     STATUS_CHOICES = [
@@ -28,6 +44,7 @@ class Ticket(models.Model):
     created_at = jmodels.jDateTimeField(auto_now_add=True, verbose_name='ساخته شده در')
     updated_at = jmodels.jDateTimeField(auto_now=True, verbose_name='اپدیت شده در')
     order = models.ForeignKey(OrderModel ,blank=True, null=True, on_delete=models.SET_NULL)
+    attachments = models.ManyToManyField(Attachment, related_name='tickets', blank=True)
 
     def __str__(self):
         return self.subject
@@ -44,6 +61,7 @@ class Message(models.Model):
     sender = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name='ارسال کننده')
     content = models.TextField(verbose_name='محتوای پیام')
     created_at = jmodels.jDateTimeField(auto_now_add=True, verbose_name='ساخته شده در')
+    attachments = models.ManyToManyField(Attachment, related_name='messages', blank=True)
 
     def __str__(self):
         return f"Message by {self.sender.full_name} on {self.ticket.subject}"