adds a "link" field to the InvenTree attachment model

- Allows attachments to also serve as links to external files

InvenTree/InvenTree/models.py

@@ -21,7 +21,8 @@ from django.dispatch import receiver
 from mptt.models import MPTTModel, TreeForeignKey
 from mptt.exceptions import InvalidMove
 
-from .validators import validate_tree_name
+from InvenTree.fields import InvenTreeURLField
+from InvenTree.validators import validate_tree_name
 
 
 logger = logging.getLogger('inventree')
@@ -89,6 +90,8 @@ class ReferenceIndexingMixin(models.Model):
 class InvenTreeAttachment(models.Model):
     """ Provides an abstracted class for managing file attachments.
 
+    An attachment can be either an uploaded file, or an external URL
+
     Attributes:
         attachment: File
         comment: String descriptor for the attachment
@@ -107,7 +110,15 @@ class InvenTreeAttachment(models.Model):
         return os.path.basename(self.attachment.name)
 
     attachment = models.FileField(upload_to=rename_attachment, verbose_name=_('Attachment'),
-                                  help_text=_('Select file to attach'))
+                                  help_text=_('Select file to attach'),
+                                  blank=True, null=True
+                                  )
+
+    link = InvenTreeURLField(
+        blank=True, null=True,
+        verbose_name=_('Link'),
+        help_text=_('Link to external URL')
+    )
 
     comment = models.CharField(blank=True, max_length=100, verbose_name=_('Comment'), help_text=_('File comment'))
 

InvenTree/build/migrations/0033_auto_20211128_0151.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.2.5 on 2021-11-28 01:51
+
+import InvenTree.fields
+import InvenTree.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('build', '0032_auto_20211014_0632'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='buildorderattachment',
+            name='link',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external URL', null=True, verbose_name='Link'),
+        ),
+        migrations.AlterField(
+            model_name='buildorderattachment',
+            name='attachment',
+            field=models.FileField(blank=True, help_text='Select file to attach', null=True, upload_to=InvenTree.models.rename_attachment, verbose_name='Attachment'),
+        ),
+    ]

InvenTree/order/migrations/0053_auto_20211128_0151.py

@@ -0,0 +1,35 @@
+# Generated by Django 3.2.5 on 2021-11-28 01:51
+
+import InvenTree.fields
+import InvenTree.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('order', '0052_auto_20211014_0631'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchaseorderattachment',
+            name='link',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external URL', null=True, verbose_name='Link'),
+        ),
+        migrations.AddField(
+            model_name='salesorderattachment',
+            name='link',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external URL', null=True, verbose_name='Link'),
+        ),
+        migrations.AlterField(
+            model_name='purchaseorderattachment',
+            name='attachment',
+            field=models.FileField(blank=True, help_text='Select file to attach', null=True, upload_to=InvenTree.models.rename_attachment, verbose_name='Attachment'),
+        ),
+        migrations.AlterField(
+            model_name='salesorderattachment',
+            name='attachment',
+            field=models.FileField(blank=True, help_text='Select file to attach', null=True, upload_to=InvenTree.models.rename_attachment, verbose_name='Attachment'),
+        ),
+    ]

InvenTree/part/migrations/0075_auto_20211128_0151.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.2.5 on 2021-11-28 01:51
+
+import InvenTree.fields
+import InvenTree.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0074_partcategorystar'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='partattachment',
+            name='link',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external URL', null=True, verbose_name='Link'),
+        ),
+        migrations.AlterField(
+            model_name='partattachment',
+            name='attachment',
+            field=models.FileField(blank=True, help_text='Select file to attach', null=True, upload_to=InvenTree.models.rename_attachment, verbose_name='Attachment'),
+        ),
+    ]

InvenTree/stock/migrations/0070_auto_20211128_0151.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.2.5 on 2021-11-28 01:51
+
+import InvenTree.fields
+import InvenTree.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0069_auto_20211109_2347'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='stockitemattachment',
+            name='link',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external URL', null=True, verbose_name='Link'),
+        ),
+        migrations.AlterField(
+            model_name='stockitemattachment',
+            name='attachment',
+            field=models.FileField(blank=True, help_text='Select file to attach', null=True, upload_to=InvenTree.models.rename_attachment, verbose_name='Attachment'),
+        ),
+    ]