Remove line_cost from OrderItem

lms/djangoapps/shoppingcart/migrations/0003_auto__del_field_orderitem_line_cost.py

+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Deleting field 'OrderItem.line_cost'
+        db.delete_column('shoppingcart_orderitem', 'line_cost')
+
+
+    def backwards(self, orm):
+        # Adding field 'OrderItem.line_cost'
+        db.add_column('shoppingcart_orderitem', 'line_cost',
+                      self.gf('django.db.models.fields.DecimalField')(default=0.0, max_digits=30, decimal_places=2),
+                      keep_default=False)
+
+
+    models = {
+        'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '80'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'})
+        },
+        'auth.permission': {
+            'Meta': {'ordering': "('content_type__app_label', 'content_type__model', 'codename')", 'unique_together': "(('content_type', 'codename'),)", 'object_name': 'Permission'},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['contenttypes.ContentType']"}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        'auth.user': {
+            'Meta': {'object_name': 'User'},
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '75', 'blank': 'True'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['auth.Group']", 'symmetrical': 'False', 'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'}),
+            'username': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'})
+        },
+        'contenttypes.contenttype': {
+            'Meta': {'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)", 'object_name': 'ContentType', 'db_table': "'django_content_type'"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        'shoppingcart.certificateitem': {
+            'Meta': {'object_name': 'CertificateItem', '_ormbases': ['shoppingcart.OrderItem']},
+            'course_enrollment': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['student.CourseEnrollment']"}),
+            'course_id': ('django.db.models.fields.CharField', [], {'max_length': '128', 'db_index': 'True'}),
+            'mode': ('django.db.models.fields.SlugField', [], {'max_length': '50'}),
+            'orderitem_ptr': ('django.db.models.fields.related.OneToOneField', [], {'to': "orm['shoppingcart.OrderItem']", 'unique': 'True', 'primary_key': 'True'})
+        },
+        'shoppingcart.order': {
+            'Meta': {'object_name': 'Order'},
+            'bill_to_cardtype': ('django.db.models.fields.CharField', [], {'max_length': '32', 'blank': 'True'}),
+            'bill_to_ccnum': ('django.db.models.fields.CharField', [], {'max_length': '8', 'blank': 'True'}),
+            'bill_to_city': ('django.db.models.fields.CharField', [], {'max_length': '64', 'blank': 'True'}),
+            'bill_to_country': ('django.db.models.fields.CharField', [], {'max_length': '64', 'blank': 'True'}),
+            'bill_to_first': ('django.db.models.fields.CharField', [], {'max_length': '64', 'blank': 'True'}),
+            'bill_to_last': ('django.db.models.fields.CharField', [], {'max_length': '64', 'blank': 'True'}),
+            'bill_to_postalcode': ('django.db.models.fields.CharField', [], {'max_length': '16', 'blank': 'True'}),
+            'bill_to_state': ('django.db.models.fields.CharField', [], {'max_length': '8', 'blank': 'True'}),
+            'bill_to_street1': ('django.db.models.fields.CharField', [], {'max_length': '128', 'blank': 'True'}),
+            'bill_to_street2': ('django.db.models.fields.CharField', [], {'max_length': '128', 'blank': 'True'}),
+            'currency': ('django.db.models.fields.CharField', [], {'default': "'usd'", 'max_length': '8'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'processor_reply_dump': ('django.db.models.fields.TextField', [], {'blank': 'True'}),
+            'purchase_time': ('django.db.models.fields.DateTimeField', [], {'null': 'True', 'blank': 'True'}),
+            'status': ('django.db.models.fields.CharField', [], {'default': "'cart'", 'max_length': '32'}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['auth.User']"})
+        },
+        'shoppingcart.orderitem': {
+            'Meta': {'object_name': 'OrderItem'},
+            'currency': ('django.db.models.fields.CharField', [], {'default': "'usd'", 'max_length': '8'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'line_desc': ('django.db.models.fields.CharField', [], {'default': "'Misc. Item'", 'max_length': '1024'}),
+            'order': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['shoppingcart.Order']"}),
+            'qty': ('django.db.models.fields.IntegerField', [], {'default': '1'}),
+            'status': ('django.db.models.fields.CharField', [], {'default': "'cart'", 'max_length': '32'}),
+            'unit_cost': ('django.db.models.fields.DecimalField', [], {'default': '0.0', 'max_digits': '30', 'decimal_places': '2'}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['auth.User']"})
+        },
+        'shoppingcart.paidcourseregistration': {
+            'Meta': {'object_name': 'PaidCourseRegistration', '_ormbases': ['shoppingcart.OrderItem']},
+            'course_id': ('django.db.models.fields.CharField', [], {'max_length': '128', 'db_index': 'True'}),
+            'mode': ('django.db.models.fields.SlugField', [], {'default': "'honor'", 'max_length': '50'}),
+            'orderitem_ptr': ('django.db.models.fields.related.OneToOneField', [], {'to': "orm['shoppingcart.OrderItem']", 'unique': 'True', 'primary_key': 'True'})
+        },
+        'student.courseenrollment': {
+            'Meta': {'ordering': "('user', 'course_id')", 'unique_together': "(('user', 'course_id'),)", 'object_name': 'CourseEnrollment'},
+            'course_id': ('django.db.models.fields.CharField', [], {'max_length': '255', 'db_index': 'True'}),
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'null': 'True', 'db_index': 'True', 'blank': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'mode': ('django.db.models.fields.CharField', [], {'default': "'honor'", 'max_length': '100'}),
+            'user': ('django.db.models.fields.related.ForeignKey', [], {'to': "orm['auth.User']"})
+        }
+    }
+
+    complete_apps = ['shoppingcart']
\ No newline at end of file

lms/djangoapps/shoppingcart/models.py

@@ -133,14 +133,19 @@ class OrderItem(models.Model):
     status = models.CharField(max_length=32, default='cart', choices=ORDER_STATUSES)
     qty = models.IntegerField(default=1)
     unit_cost = models.DecimalField(default=0.0, decimal_places=2, max_digits=30)
-    line_cost = models.DecimalField(default=0.0, decimal_places=2, max_digits=30)  # qty * unit_cost
     line_desc = models.CharField(default="Misc. Item", max_length=1024)
     currency = models.CharField(default="usd", max_length=8)  # lower case ISO currency codes
 
+    @property
+    def line_cost(self):
+        return self.qty * self.unit_cost
+
     @classmethod
     def add_to_order(cls, *args, **kwargs):
         """
         A suggested convenience function for subclasses.
+
+        NOTE: This does not add anything items to the cart. That is left up to the subclasses
         """
         # this is a validation step to verify that the currency of the item we
         # are adding is the same as the currency of the order we are adding it
@@ -204,7 +209,6 @@ class PaidCourseRegistration(OrderItem):
         item.mode = course_mode.slug
         item.qty = 1
         item.unit_cost = cost
-        item.line_cost = cost
         item.line_desc = 'Registration for Course: {0}. Mode: {1}'.format(get_course_about_section(course, "title"),
                                                                           course_mode.name)
         item.currency = currency
@@ -283,7 +287,6 @@ class CertificateItem(OrderItem):
         item.status = order.status
         item.qty = 1
         item.unit_cost = cost
-        item.line_cost = cost
         item.line_desc = "{mode} certificate for course {course_id}".format(mode=item.mode,
                                                                             course_id=course_id)
         item.currency = currency

lms/djangoapps/shoppingcart/tests.py

@@ -87,6 +87,7 @@ class OrderItemTest(TestCase):
         with self.assertRaises(NotImplementedError):
             item.purchased_callback()
 
+
 @override_settings(MODULESTORE=TEST_DATA_MONGO_MODULESTORE)
 class PaidCourseRegistrationTest(ModuleStoreTestCase):
     def setUp(self):
@@ -111,7 +112,7 @@ class PaidCourseRegistrationTest(ModuleStoreTestCase):
         self.assertEqual(reg1.user, self.user)
         self.assertEqual(reg1.status, "cart")
         self.assertTrue(PaidCourseRegistration.part_of_order(self.cart, self.course_id))
-        self.assertFalse(PaidCourseRegistration.part_of_order(self.cart, self.course_id+"abcd"))
+        self.assertFalse(PaidCourseRegistration.part_of_order(self.cart, self.course_id + "abcd"))
         self.assertEqual(self.cart.total_cost, self.cost)
 
     def test_add_with_default_mode(self):
@@ -133,7 +134,7 @@ class PaidCourseRegistrationTest(ModuleStoreTestCase):
         reg1 = PaidCourseRegistration.add_to_order(self.cart, self.course_id)
         self.cart.purchase()
         self.assertTrue(CourseEnrollment.is_enrolled(self.user, self.course_id))
-        reg1 = PaidCourseRegistration.objects.get(id=reg1.id) # reload from DB to get side-effect
+        reg1 = PaidCourseRegistration.objects.get(id=reg1.id)  # reload from DB to get side-effect
         self.assertEqual(reg1.status, "purchased")
 
     def test_purchased_callback_exception(self):