add media backend

app/media/models.py

@@ -0,0 +1,25 @@
+from django.db import models
+from django.urls import reverse
+
+
+class Image(models.Model):
+    created = models.DateTimeField(auto_now_add=True)
+    modified = models.DateTimeField(auto_now=True)
+
+    file = models.ImageField(upload_to='image', null=True, blank=True)
+
+    def get_absolute_url(self):
+        return self.file.url
+    get_absolute_url.short_description = 'URL'
+
+    def image_tag(self):
+        from django.utils.html import mark_safe
+        return mark_safe('<img src="%s" style="max-width:256px" />' % self.get_absolute_url())
+    image_tag.short_description = 'Preview'
+
+    def __str__(self):
+        if self.file:
+            name = self.file.name.split('/')[-1]
+        else:
+            name = 'None'
+        return name