AA-545: Include has_scheduled_content in StartDateTransformer

lms/djangoapps/course_api/blocks/api.py

@@ -72,6 +72,7 @@ def get_blocks(
     if requested_fields is None:
         requested_fields = []
     include_completion = 'completion' in requested_fields
+    include_has_scheduled_content = 'has_scheduled_content' in requested_fields
     include_special_exams = 'special_exam_info' in requested_fields
     include_gated_sections = 'show_gated_sections' in requested_fields
 
@@ -106,7 +107,12 @@ def get_blocks(
 
     # transform
     blocks = course_blocks_api.get_course_blocks(
-        user, usage_key, transformers, allow_start_dates_in_future=allow_start_dates_in_future)
+        user,
+        usage_key,
+        transformers,
+        allow_start_dates_in_future=allow_start_dates_in_future,
+        include_has_scheduled_content=include_has_scheduled_content
+    )
 
     # filter blocks by types
     if block_types_filter:

lms/djangoapps/course_api/blocks/serializers.py

@@ -52,6 +52,7 @@ SUPPORTED_FIELDS = [
     SupportedFieldType('due'),
     SupportedFieldType('contains_gated_content'),
     SupportedFieldType('has_score'),
+    SupportedFieldType('has_scheduled_content'),
     SupportedFieldType('weight'),
     SupportedFieldType('show_correctness'),
     # 'student_view_data'

lms/djangoapps/course_blocks/api.py

@@ -61,6 +61,7 @@ def get_course_blocks(
         collected_block_structure=None,
         allow_start_dates_in_future=False,
         include_completion=False,
+        include_has_scheduled_content=False,
 ):
     """
     A higher order function implemented on top of the
@@ -96,7 +97,12 @@ def get_course_blocks(
         transformers = BlockStructureTransformers(get_course_block_access_transformers(user))
     if include_completion:
         transformers += [BlockCompletionTransformer()]
-    transformers.usage_info = CourseUsageInfo(starting_block_usage_key.course_key, user, allow_start_dates_in_future)
+    transformers.usage_info = CourseUsageInfo(
+        starting_block_usage_key.course_key,
+        user,
+        allow_start_dates_in_future,
+        include_has_scheduled_content
+    )
 
     return get_block_structure_manager(starting_block_usage_key.course_key).get_transformed(
         transformers,

lms/djangoapps/course_blocks/transformers/start_date.py

@@ -43,6 +43,23 @@ class StartDateTransformer(FilteringTransformerMixin, BlockStructureTransformer)
         """
         return "start_date"
 
+    @classmethod
+    def _check_has_scheduled_content(cls, block_structure, scheduled_content_condition):
+        '''
+        Returns a block structure where the root course block has been
+        updated to include a has_scheduled_content field (True if the course
+        has any blocks with release dates in the future, False otherwise).
+        '''
+        has_scheduled_content = False
+        for block_key in block_structure.topological_traversal():
+            if scheduled_content_condition(block_key):
+                has_scheduled_content = True
+                break
+
+        block_structure.override_xblock_field(
+            block_structure.root_block_usage_key, 'has_scheduled_content', has_scheduled_content
+        )
+
     @classmethod
     def _get_merged_start_date(cls, block_structure, block_key):
         """
@@ -85,4 +102,8 @@ class StartDateTransformer(FilteringTransformerMixin, BlockStructureTransformer)
             usage_info.course_key,
             now=now,
         )
+
+        if usage_info.include_has_scheduled_content:
+            self._check_has_scheduled_content(block_structure, removal_condition)
+
         return [block_structure.create_removal_filter(removal_condition)]

lms/djangoapps/course_blocks/usage_info.py

@@ -14,7 +14,7 @@ class CourseUsageInfo(object):
     an instance of it in calls to BlockStructureTransformer.transform
     methods.
     '''
-    def __init__(self, course_key, user, allow_start_dates_in_future=False):
+    def __init__(self, course_key, user, allow_start_dates_in_future=False, include_has_scheduled_content=False):
         # Course identifier (opaque_keys.edx.keys.CourseKey)
         self.course_key = course_key
 
@@ -27,6 +27,11 @@ class CourseUsageInfo(object):
         # assignments that have not yet been released.
         self.allow_start_dates_in_future = allow_start_dates_in_future
 
+        # This value is used within the StartDateTransformer in the case where we
+        # would like to know whether there are future start dates, while still
+        # filtering the blocks with start dates in the future.
+        self.include_has_scheduled_content = include_has_scheduled_content
+
         # Cached value of whether the user has staff access (bool/None)
         self._has_staff_access = None