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Fix the order randomization behaviour of Randomized Content Block

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The Randomized Content Block XBlock only randomizes the selection of
the children blocks and has unpredictable randomization of
the order of the selected child blocks due to the usage of sets, which
are unordered, for storing the selected blocks. This becomes apparent
when all the available child blocks in a library are chosen for a
Randomized Content Block, to randomize just the order of the child
blocks and not just the selection of the blocks. The order of the
selected blocks ends up being similar for multiple learners.

This change modifies the XBlock to store the selected child blocks in
a list, instead of a set, after randomly shuffling them.
This commit is contained in:
Guruprasad Lakshmi Narayanan
2018-07-23 13:37:04 +05:30
parent 9189daeb58
commit 5a2b607ea6
6 changed files with 160 additions and 38 deletions
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1
setup.py
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@@ -53,6 +53,7 @@ setup(
],
"openedx.block_structure_transformer": [
"library_content = lms.djangoapps.course_blocks.transformers.library_content:ContentLibraryTransformer",
"library_content_randomize = lms.djangoapps.course_blocks.transformers.library_content:ContentLibraryOrderTransformer",
"split_test = lms.djangoapps.course_blocks.transformers.split_test:SplitTestTransformer",
"start_date = lms.djangoapps.course_blocks.transformers.start_date:StartDateTransformer",
"user_partitions = lms.djangoapps.course_blocks.transformers.user_partitions:UserPartitionTransformer",