Add modified_date to ImportedFile.

This makes it easier to see when files have been updated so we can reindex smarter

Author: ericholscher

readthedocs/projects/migrations/0030_add_modified_date_importedfile.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.16 on 2018-11-01 14:37
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('projects', '0029_add_additional_languages'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='importedfile',
+            name='modified_date',
+            field=models.DateTimeField(auto_now=True, verbose_name='Modified date'),
+        ),
+    ]

readthedocs/projects/models.py

@@ -943,6 +943,7 @@ class ImportedFile(models.Model):
     path = models.CharField(_('Path'), max_length=255)
     md5 = models.CharField(_('MD5 checksum'), max_length=255)
     commit = models.CharField(_('Commit'), max_length=255)
+    modified_date = models.DateTimeField(_('Modified date'), auto_now=True)
 
     def get_absolute_url(self):
         return resolve(project=self.project, version_slug=self.version.slug, filename=self.path)