Add PartParameter table

InvenTree/part/migrations/0014_partparameter.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.2.4 on 2019-08-20 02:30
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0013_auto_20190628_0951'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='PartParameter',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(help_text='Parameter Name', max_length=100)),
+                ('data', models.CharField(help_text='Parameter Value', max_length=100)),
+                ('part', models.ForeignKey(help_text='Parent Part', on_delete=django.db.models.deletion.CASCADE, related_name='parameters', to='part.Part')),
+            ],
+        ),
+    ]

InvenTree/part/models.py

@@ -1028,6 +1028,28 @@ class PartStar(models.Model):
         unique_together = ['part', 'user']
 
 
+class PartParameter(models.Model):
+    """ A PartParameter provides key:value pairs for extra 
+    parameters fields/values to be added to a Part.
+    This allows users to arbitrarily assign data fields to a Part
+    beyond the built-in attributes.
+
+    Attributes:
+        part: Link to a Part object
+        name: The name (key) of the Parameter [string]
+        data: The data (value) of the Parameter [string]
+    """
+
+    part = models.ForeignKey(Part, on_delete=models.CASCADE,
+        related_name='parameters',
+        help_text='Parent Part',
+    )
+
+    name = models.CharField(max_length=100, help_text='Parameter Name')
+
+    data = models.CharField(max_length=100, help_text='Parameter Value')
+
+
 class BomItem(models.Model):
     """ A BomItem links a part to its component items.
     A part can have a BOM (bill of materials) which defines