Updated Supplier models

- Added cost calculation for supplier part
- Added more validators and help text

InvenTree/part/migrations/0006_auto_20190416_2354.py

@@ -0,0 +1,30 @@
+# Generated by Django 2.2 on 2019-04-16 13:54
+
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0005_part_consumable'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='bomitem',
+            name='sub_part',
+            field=models.ForeignKey(limit_choices_to={'consumable': True}, on_delete=django.db.models.deletion.CASCADE, related_name='used_in', to='part.Part'),
+        ),
+        migrations.AlterField(
+            model_name='part',
+            name='consumable',
+            field=models.BooleanField(default=True, help_text='Can this part be used to build other parts?'),
+        ),
+        migrations.AlterField(
+            model_name='supplierpricebreak',
+            name='quantity',
+            field=models.PositiveIntegerField(validators=[django.core.validators.MinValueValidator(2)]),
+        ),
+    ]

InvenTree/part/migrations/0007_auto_20190417_0007.py

@@ -0,0 +1,54 @@
+# Generated by Django 2.2 on 2019-04-16 14:07
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0006_auto_20190416_2354'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='supplierpart',
+            name='note',
+            field=models.CharField(blank=True, help_text='Notes', max_length=100),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='base_cost',
+            field=models.DecimalField(decimal_places=3, default=0, help_text='Minimum charge (e.g. stocking fee)', max_digits=10, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='description',
+            field=models.CharField(blank=True, help_text='Supplier part description', max_length=250),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='minimum',
+            field=models.PositiveIntegerField(default=1, help_text='Minimum order quantity (MOQ)', validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='multiple',
+            field=models.PositiveIntegerField(default=1, help_text='Order multiple', validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='packaging',
+            field=models.CharField(blank=True, help_text='Part packaging', max_length=50),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='single_price',
+            field=models.DecimalField(decimal_places=3, default=0, help_text='Price for single quantity', max_digits=10, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+        migrations.AlterField(
+            model_name='supplierpricebreak',
+            name='cost',
+            field=models.DecimalField(decimal_places=3, max_digits=10, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+    ]