Improve validators for 'filters' field

InvenTree/label/migrations/0005_auto_20210113_2302.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.0.7 on 2021-01-13 12:02
+
+from django.db import migrations, models
+import label.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('label', '0004_auto_20210111_2302'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitemlabel',
+            name='filters',
+            field=models.CharField(blank=True, help_text='Query filters (comma-separated list of key=value pairs', max_length=250, validators=[label.models.validate_stock_item_filters], verbose_name='Filters'),
+        ),
+        migrations.AlterField(
+            model_name='stocklocationlabel',
+            name='filters',
+            field=models.CharField(blank=True, help_text='Query filters (comma-separated list of key=value pairs', max_length=250, validators=[label.models.validate_stock_location_filters], verbose_name='Filters'),
+        ),
+    ]