Set default value for SupplierPriceBreak

Edit or Delete a SupplierPriceBreak

InvenTree/part/migrations/0031_auto_20190518_1650.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.2 on 2019-05-18 06:50
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0030_auto_20190518_1641'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='supplierpricebreak',
+            name='quantity',
+            field=models.PositiveIntegerField(default=1, validators=[django.core.validators.MinValueValidator(1)]),
+        ),
+    ]

InvenTree/part/models.py

@@ -892,6 +892,12 @@ class SupplierPart(models.Model):
         - If order multiples are to be observed, then we need to calculate based on that, too
         """
 
+        price_breaks = self.price_breaks.all()
+
+        # No price break information available?
+        if len(price_breaks) == 0:
+            return None
+
         # Minimum ordering requirement
         if moq and self.minimum > quantity:
             quantity = self.minimum
@@ -946,7 +952,7 @@ class SupplierPriceBreak(models.Model):
 
     part = models.ForeignKey(SupplierPart, on_delete=models.CASCADE, related_name='pricebreaks')
 
-    quantity = models.PositiveIntegerField(validators=[MinValueValidator(1)])
+    quantity = models.PositiveIntegerField(default=1, validators=[MinValueValidator(1)])
 
     cost = models.DecimalField(max_digits=10, decimal_places=3, validators=[MinValueValidator(0)])
 

InvenTree/part/views.py

@@ -834,7 +834,6 @@ class PriceBreakCreate(AjaxCreateView):
     def get_form(self):
 
         form = super(AjaxCreateView, self).get_form()
-
         form.fields['part'].widget = HiddenInput()
 
         return form
@@ -858,6 +857,13 @@ class PriceBreakEdit(AjaxUpdateView):
     ajax_form_title = 'Edit Price Break'
     ajax_template_name = 'modal_form.html'
 
+    def get_form(self):
+
+        form = super(AjaxUpdateView, self).get_form()
+        form.fields['part'].widget = HiddenInput()
+
+        return form
+
 
 class PriceBreakDelete(AjaxDeleteView):
     """ View for deleting a supplier price break """