Add ReportAsset model

- Files which can be embedded into a report

InvenTree/report/admin.py

@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 
 from django.contrib import admin
 
-from .models import ReportTemplate
+from .models import ReportTemplate, ReportAsset
 
 
 class ReportTemplateAdmin(admin.ModelAdmin):
@@ -11,4 +11,10 @@ class ReportTemplateAdmin(admin.ModelAdmin):
     list_display = ('template', 'description')
 
 
+class ReportAssetAdmin(admin.ModelAdmin):
+
+    list_display = ('asset', 'description')
+
+
 admin.site.register(ReportTemplate, ReportTemplateAdmin)
+admin.site.register(ReportAsset, ReportAssetAdmin)

InvenTree/report/migrations/0003_reportasset.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.0.5 on 2020-05-21 04:04
+
+from django.db import migrations, models
+import report.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('report', '0002_auto_20200521_0350'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ReportAsset',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('asset', models.FileField(help_text='Report asset file', upload_to=report.models.rename_asset)),
+                ('description', models.CharField(help_text='Asset file description', max_length=250)),
+            ],
+        ),
+    ]

InvenTree/report/models.py

@@ -17,7 +17,7 @@ def rename_template(instance, filename):
 
     filename = os.path.basename(filename)
 
-    return os.path.join('report', 'template', filename)
+    return os.path.join('report', 'report_template', filename)
 
 
 class ReportTemplate(models.Model):
@@ -35,3 +35,29 @@ class ReportTemplate(models.Model):
     )
 
     description = models.CharField(max_length=250, help_text=_("Report template description"))
+
+
+def rename_asset(instance, filename):
+
+    filename = os.path.basename(filename)
+
+    return os.path.join('report', 'assets', filename)
+
+
+class ReportAsset(models.Model):
+    """
+    Asset file for use in report templates.
+    For example, an image to use in a header file.
+    Uploaded asset files appear in MEDIA_ROOT/report/assets,
+    and can be loaded in a template using the {% report_asset <filename> %} tag.
+    """
+
+    def __str__(self):
+        return os.path.basename(self.asset.name)
+
+    asset = models.FileField(
+        upload_to=rename_asset,
+        help_text=_("Report asset file"),
+    )
+
+    description = models.CharField(max_length=250, help_text=_("Asset file description"))