fix: Fixed broken HiddenContentTransformer when course pacing is self_paced

fix: Fixed broken HiddenContentTransformer when course pacing is self_pace

In case of self paced course we are relying on course end date to determine if a block is visible or not. However, when course blocks API is called with a block_key it breaks since all blocks do not have end field instead only course block has end field. These Changes fetch end date of block from parent or ancestors blocks to make sure we have course end date available while determining block visibility.

lms/djangoapps/course_blocks/transformers/hidden_content.py

@@ -10,7 +10,7 @@ from pytz import utc
 from openedx.core.djangoapps.content.block_structure.transformer import BlockStructureTransformer
 from xmodule.seq_module import SequenceBlock  # lint-amnesty, pylint: disable=wrong-import-order
 
-from .utils import collect_merged_boolean_field
+from .utils import collect_merged_boolean_field, collect_merged_date_field
 
 MAXIMUM_DATE = utc.localize(datetime.max)
 
@@ -31,9 +31,10 @@ class HiddenContentTransformer(BlockStructureTransformer):
     IMPORTANT: Must be run _after_ the DateOverrideTransformer from edx-when
     in case the 'due' date on a block has been shifted for a user.
     """
-    WRITE_VERSION = 3
+    WRITE_VERSION = 4
     READ_VERSION = 3
     MERGED_HIDE_AFTER_DUE = 'merged_hide_after_due'
+    MERGED_END_DATE = 'merged_end_date'
 
     @classmethod
     def name(cls):
@@ -66,6 +67,13 @@ class HiddenContentTransformer(BlockStructureTransformer):
             xblock_field_name='hide_after_due',
             merged_field_name=cls.MERGED_HIDE_AFTER_DUE,
         )
+        collect_merged_date_field(
+            block_structure,
+            transformer=cls,
+            xblock_field_name='end',
+            merged_field_name=cls.MERGED_END_DATE,
+            default_date=MAXIMUM_DATE
+        )
 
         block_structure.request_xblock_fields('self_paced', 'end', 'due')