36 lines
1.4 KiB
Python
36 lines
1.4 KiB
Python
"""
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Utility library containing operations used/shared by multiple courseware modules
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"""
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def yield_dynamic_descriptor_descendants(descriptor, user_id, module_creator): # pylint: disable=invalid-name
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"""
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This returns all of the descendants of a descriptor. If the descriptor
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has dynamic children, the module will be created using module_creator
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and the children (as descriptors) of that module will be returned.
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"""
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stack = [descriptor]
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while len(stack) > 0:
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next_descriptor = stack.pop()
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stack.extend(get_dynamic_descriptor_children(next_descriptor, user_id, module_creator))
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yield next_descriptor
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def get_dynamic_descriptor_children(descriptor, user_id, module_creator=None, usage_key_filter=None):
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"""
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Returns the children of the given descriptor, while supporting descriptors with dynamic children.
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"""
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module_children = []
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if descriptor.has_dynamic_children():
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# do not rebind the module if it's already bound to a user.
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if descriptor.scope_ids.user_id and user_id == descriptor.scope_ids.user_id:
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module = descriptor
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else:
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module = module_creator(descriptor)
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if module is not None:
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module_children = module.get_child_descriptors()
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else:
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module_children = descriptor.get_children(usage_key_filter)
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return module_children
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