Added PartRevision model

- Added 'trackable' field to Part

InvenTree/part/models.py

@@ -22,6 +22,7 @@ class Part(models.Model):
     category = models.ForeignKey(PartCategory, on_delete=models.CASCADE)
     minimum_stock = models.IntegerField(default=0)
     units = models.CharField(max_length=20, default="pcs", blank=True)
+    trackable = models.BooleanField(default=False)
     
     def __str__(self):
         if self.IPN:
@@ -35,4 +36,18 @@ class Part(models.Model):
         verbose_name = "Part"
         verbose_name_plural = "Parts"
 
+class PartRevision(models.Model):
+    """ A PartRevision represents a change-notification to a Part
+    A Part may go through several revisions in its lifetime,
+    which should be tracked.
+    UniqueParts can have a single associated PartRevision
+    """
     
+    part = models.ForeignKey(Part, on_delete=models.CASCADE)
+    
+    name = models.CharField(max_length=100)
+    description = models.CharField(max_length=500)
+    revision_date = models.DateField(auto_now_add = True)
+    
+    def __str__(self):
+        return self.name

InvenTree/track/admin.py

@@ -2,4 +2,7 @@ from django.contrib import admin
 
 from .models import UniquePart
 
-admin.site.register(UniquePart)
+class UniquePartAdmin(admin.ModelAdmin):
+    list_display = ('part', 'revision', 'serial', 'creation_date')
+
+admin.site.register(UniquePart, UniquePartAdmin)

InvenTree/track/models.py

@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 from django.db import models
 from django.contrib.auth.models import User
 
-from part.models import Part
+from part.models import Part, PartRevision
 
 class UniquePart(models.Model):
     """ A unique instance of a Part object.
@@ -12,12 +12,21 @@ class UniquePart(models.Model):
     """
     
     part = models.ForeignKey(Part, on_delete=models.CASCADE)
-    created = models.DateField(auto_now_add=True,
+    
+    revision = models.ForeignKey(PartRevision,
+                                 on_delete=models.CASCADE,
+                                 blank=True,
+                                 null=True)
+    
+    creation_date = models.DateField(auto_now_add=True,
                                editable=False)
     serial = models.IntegerField()
     
     createdBy = models.ForeignKey(User)
 
+    def __str__(self):
+        return self.part.name
+    
 class PartTrackingInfo(models.Model):
     """ Single data-point in the life of a UniquePart
     Each time something happens to the UniquePart,