feat: add printing_job field to SalesOrderItem model for associating with printing tasks

business/migrations/0017_salesorderitem_printing_job.py

@@ -0,0 +1,24 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('printing', '0021_plateorder_print_count_printingorder_print_count'),
+        ('business', '0016_payment_receipt_discount'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='salesorderitem',
+            name='printing_job',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=models.SET_NULL,
+                related_name='sales_order_items',
+                to='printing.printingjob',
+                verbose_name='关联印染任务',
+            ),
+        ),
+    ]