Enforcing XBlock variable types

drag_and_drop_v2/drag_and_drop_v2.py

@@ -63,6 +63,7 @@ class DragAndDropBlock(
         help=_("The title of the drag and drop problem. The title is displayed to learners."),
         scope=Scope.settings,
         default=_("Drag and Drop"),
+        enforce_type=True,
     )
 
     mode = String(
@@ -78,7 +79,8 @@ class DragAndDropBlock(
             {"display_name": _("Standard"), "value": Constants.STANDARD_MODE},
             {"display_name": _("Assessment"), "value": Constants.ASSESSMENT_MODE},
         ],
-        default=Constants.STANDARD_MODE
+        default=Constants.STANDARD_MODE,
+        enforce_type=True,
     )
 
     max_attempts = Integer(
@@ -89,6 +91,7 @@ class DragAndDropBlock(
         ),
         scope=Scope.settings,
         default=None,
+        enforce_type=True,
     )
 
     show_title = Boolean(
@@ -96,6 +99,7 @@ class DragAndDropBlock(
         help=_("Display the title to the learner?"),
         scope=Scope.settings,
         default=True,
+        enforce_type=True,
     )
 
     question_text = String(
@@ -103,6 +107,7 @@ class DragAndDropBlock(
         help=_("The description of the problem or instructions shown to the learner."),
         scope=Scope.settings,
         default="",
+        enforce_type=True,
     )
 
     show_question_header = Boolean(
@@ -110,6 +115,7 @@ class DragAndDropBlock(
         help=_('Display the heading "Problem" above the problem text?'),
         scope=Scope.settings,
         default=True,
+        enforce_type=True,
     )
 
     weight = Float(
@@ -117,6 +123,7 @@ class DragAndDropBlock(
         help=_("Defines the number of points the problem is worth."),
         scope=Scope.settings,
         default=1,
+        enforce_type=True,
     )
 
     item_background_color = String(
@@ -124,6 +131,7 @@ class DragAndDropBlock(
         help=_("The background color of draggable items in the problem (example: 'blue' or '#0000ff')."),
         scope=Scope.settings,
         default="",
+        enforce_type=True,
     )
 
     item_text_color = String(
@@ -131,13 +139,15 @@ class DragAndDropBlock(
         help=_("Text color to use for draggable items (example: 'white' or '#ffffff')."),
         scope=Scope.settings,
         default="",
+        enforce_type=True,
     )
 
     max_items_per_zone = Integer(
         display_name=_("Maximum items per zone"),
         help=_("This setting limits the number of items that can be dropped into a single zone."),
         scope=Scope.settings,
-        default=None
+        default=None,
+        enforce_type=True,
     )
 
     data = Dict(
@@ -149,24 +159,28 @@ class DragAndDropBlock(
         ),
         scope=Scope.content,
         default=DEFAULT_DATA,
+        enforce_type=True,
     )
 
     item_state = Dict(
         help=_("Information about current positions of items that a learner has dropped on the target image."),
         scope=Scope.user_state,
         default={},
+        enforce_type=True,
     )
 
     attempts = Integer(
         help=_("Number of attempts learner used"),
         scope=Scope.user_state,
-        default=0
+        default=0,
+        enforce_type=True,
     )
 
     completed = Boolean(
         help=_("Indicates whether a learner has completed the problem at least once"),
         scope=Scope.user_state,
         default=False,
+        enforce_type=True,
     )
 
     grade = Float(
@@ -178,7 +192,8 @@ class DragAndDropBlock(
     raw_earned = Float(
         help=_("Keeps maximum score achieved by student as a raw value between 0 and 1."),
         scope=Scope.user_state,
-        default=0
+        default=0,
+        enforce_type=True,
     )
 
     block_settings_key = 'drag-and-drop-v2'

pylintrc

@@ -3,6 +3,7 @@ reports=no
 
 [FORMAT]
 max-line-length=120
+max-module-lines=1500
 
 [MESSAGES CONTROL]
 disable=

tests/unit/test_basics.py

@@ -236,6 +236,17 @@ class BasicTests(TestCaseMixin, unittest.TestCase):
 
         self.assertIsNone(self.block.max_items_per_zone)
 
+    def test_studio_submit_coerce_to_integer(self):
+        # Validate that numbers submitted as strings are being
+        # coerced to integers rather than being saved as strings
+        def modify_submission(submission):
+            submission['max_attempts'] = '1234567890'
+
+        body = self._make_submission(modify_submission)
+        self.call_handler('studio_submit', body)
+        self.assertEqual(self.block.max_attempts, 1234567890)
+        self.assertEqual(type(self.block.max_attempts), int)
+
     def test_expand_static_url(self):
         """ Test the expand_static_url handler needed in Studio when changing the image """
         res = self.call_handler('expand_static_url', '/static/blah.png')