Add file_size and datetime fields to the DocumentPageCachedImage model.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -157,6 +157,8 @@
 - Expose more document fields for use in smart links.
 - The size of the document type label field has been increased
   from 32 to 96 characters.
+- Add file_size and datetime fields to the DocumentPageCachedImage
+  model.
 
 3.0.3 (2018-08-17)
 ==================

mayan/apps/documents/migrations/0047_auto_20180917_0737.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.11 on 2018-09-17 07:37
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('documents', '0046_auto_20180917_0713'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='documentpagecachedimage',
+            name='datetime',
+            field=models.DateTimeField(auto_now_add=True, db_index=True, default=django.utils.timezone.now, verbose_name='Date time'),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='documentpagecachedimage',
+            name='file_size',
+            field=models.PositiveIntegerField(db_index=True, default=0, verbose_name='File size'),
+        ),
+    ]

mayan/apps/documents/models.py

@@ -997,7 +997,13 @@ class DocumentPageCachedImage(models.Model):
         on_delete=models.CASCADE, related_name='cached_images',
         to=DocumentPage, verbose_name=_('Document page')
     )
+    datetime = models.DateTimeField(
+        auto_now_add=True, db_index=True, verbose_name=_('Date time')
+    )
     filename = models.CharField(max_length=128, verbose_name=_('Filename'))
+    file_size = models.PositiveIntegerField(
+        db_index=True, default=0, verbose_name=_('File size')
+    )
 
     class Meta:
         verbose_name = _('Document page cached image')
@@ -1007,6 +1013,11 @@ class DocumentPageCachedImage(models.Model):
         storage_documentimagecache.delete(self.filename)
         return super(DocumentPageCachedImage, self).delete(*args, **kwargs)
 
+    def save(self, *args, **kwargs):
+        self.file_size = storage_documentimagecache.size(self.filename)
+        return super(DocumentPageCachedImage, self).save(*args, **kwargs)
+
+
 
 class DocumentPageResult(DocumentPage):
     class Meta: