Generate thumbnails for any part images existing in the database

InvenTree/part/migrations/0034_auto_20200404_1238.py

@@ -0,0 +1,28 @@
+# Generated by Django 2.2.10 on 2020-04-04 12:38
+
+from django.db import migrations
+
+from part.models import Part
+from stdimage.utils import render_variations
+
+
+def create_thumbnails(apps, schema_editor):
+    """
+    Create thumbnails for all existing Part images.
+    """
+
+    for part in Part.objects.all():
+        # Render thumbnail for each existing Part 
+        if part.image:
+            part.image.render_variations()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0033_auto_20200404_0445'),
+    ]
+
+    operations = [
+        migrations.RunPython(create_thumbnails),
+    ]

InvenTree/part/models.py

@@ -304,6 +304,16 @@ class Part(models.Model):
         else:
             return os.path.join(settings.STATIC_URL, 'img/blank_image.png')
 
+    def get_thumbnail_url(self):
+        """
+        Return the URL of the image thumbnail for this part
+        """
+
+        if self.image:
+            return os.path.join(settings.MEDIA_URL, str(self.image.thumbnail.url))
+        else:
+            return os.path.join(settings.STATIC_URL, 'img/blank_image.thumbnail.png')
+
     def validate_unique(self, exclude=None):
         """ Validate that a part is 'unique'.
         Uniqueness is checked across the following (case insensitive) fields:
@@ -379,7 +389,7 @@ class Part(models.Model):
         upload_to=rename_part_image,
         null=True,
         blank=True,
-        variations={'thumbnail': (200, 200)},
+        variations={'thumbnail': (128, 128)},
         delete_orphans=True
         )