Fix requirements

>= rather than ==

InvenTree/build/migrations/0004_auto_20180417_0657.py

@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.12 on 2018-04-17 06:57
+from __future__ import unicode_literals
+
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0019_auto_20180416_1249'),
+        ('build', '0003_build_part'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='BuildOutput',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('quantity', models.PositiveIntegerField(default=1, help_text='Number of parts to build', validators=[django.core.validators.MinValueValidator(1)])),
+            ],
+        ),
+        migrations.RemoveField(
+            model_name='build',
+            name='part',
+        ),
+        migrations.RemoveField(
+            model_name='build',
+            name='quantity',
+        ),
+        migrations.AlterField(
+            model_name='build',
+            name='status',
+            field=models.PositiveIntegerField(choices=[(40, 'Cancelled'), (10, 'Pending'), (20, 'Allocated'), (50, 'Complete'), (30, 'Holding')], default=10, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+        migrations.AddField(
+            model_name='buildoutput',
+            name='build',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='outputs', to='build.Build'),
+        ),
+        migrations.AddField(
+            model_name='buildoutput',
+            name='part',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='builds', to='part.Part'),
+        ),
+    ]

InvenTree/build/models.py

@@ -1,11 +1,11 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
+from django.utils.translation import ugettext as _
+
 from django.db import models
 from django.core.validators import MinValueValidator
 
-from InvenTree.helpers import ChoiceEnum
-
 from part.models import Part
 
 class Build(models.Model):
@@ -14,22 +14,34 @@ class Build(models.Model):
     Parts are then taken from stock
     """
 
-    class BUILD_STATUS(ChoiceEnum):
-        # The build is 'pending' - no action taken yet
-        Pending = 10
+    # Build status codes
+    PENDING = 10
+    ALLOCATED = 20
+    HOLDING = 30
+    CANCELLED = 40
+    COMPLETE = 50
 
-        # The parts required for this build have been allocated
-        Allocated = 20
-
-        # The build has been cancelled (parts unallocated)
-        Cancelled = 30
-
-        # The build is complete!
-        Complete = 40
+    BUILD_STATUS_CODES = {
+       PENDING : _("Pending"),
+       ALLOCATED : _("Allocated"),
+       HOLDING : _("Holding"),
+       CANCELLED : _("Cancelled"),
+       COMPLETE : _("Complete"),
+    }
 
     # Status of the build
-    status = models.PositiveIntegerField(default=BUILD_STATUS.Pending.value,
-                                         choices=BUILD_STATUS.choices())
+    status = models.PositiveIntegerField(default=PENDING,
+                                         choices=BUILD_STATUS_CODES.items(),
+                                         validators=[MinValueValidator(0)])
+
+
+class BuildOutput(models.Model):
+    """
+    A build output represents a single build part/quantity combination
+    """
+
+    build = models.ForeignKey(Build, on_delete=models.CASCADE,
+                              related_name='outputs')
 
     part = models.ForeignKey(Part, on_delete=models.CASCADE,
                              related_name='builds')

InvenTree/stock/models.py

@@ -1,5 +1,8 @@
+# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
+
 from django.utils.translation import ugettext as _
+
 from django.db import models, transaction
 from django.core.validators import MinValueValidator
 from django.contrib.auth.models import User

requirements/base.txt

@@ -1,9 +1,9 @@
-Django==1.11
-pillow==3.1.2
-djangorestframework==3.6.2
-django_filter==1.0.2
-django-simple-history==1.8.2
-coreapi==2.3.0
-pygments==2.2.0
-django-crispy-forms==1.7.2
-django-import-export==1.0.0
+Django>=1.11
+pillow>=5.0.0
+djangorestframework>=3.6.2
+django_filter>=1.0.2
+django-simple-history>=1.8.2
+coreapi>=2.3.0
+pygments>=2.2.0
+django-crispy-forms>=1.7.2
+django-import-export>=1.0.0