197 lines
8.1 KiB
Python
197 lines
8.1 KiB
Python
import random
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import logging
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from django.conf import settings
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from module_render import get_module, get_instance_module
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from xmodule import graders
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from xmodule.graders import Score
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from models import StudentModule
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_log = logging.getLogger("mitx.courseware")
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def get_graded_sections(course_descriptor):
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"""
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Arguments:
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course_descriptor: a CourseDescriptor object for the course to be graded
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Returns:
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A dictionary keyed by section-type. The values are arrays of dictionaries containing
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"section_descriptor" : The section descriptor
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"xmoduledescriptors" : An array of xmoduledescriptors that could possibly be in the section, for any student
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"""
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all_descriptors = []
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graded_sections = {}
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for c in course_descriptor.get_children():
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sections = []
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for s in c.get_children():
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if s.metadata.get('graded', False):
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xmoduledescriptors = []
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for module in yield_descriptor_descendents(s):
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# TODO: Only include modules that have a score here
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xmoduledescriptors.append(module)
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section_description = { 'section_descriptor' : s, 'xmoduledescriptors' : xmoduledescriptors}
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section_format = s.metadata.get('format', "")
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graded_sections[ section_format ] = graded_sections.get( section_format, [] ) + [section_description]
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all_descriptors.extend(xmoduledescriptors)
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all_descriptors.append(s)
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return graded_sections, all_descriptors
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def yield_descriptor_descendents(module_descriptor):
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for child in module_descriptor.get_children():
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yield child
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for module_descriptor in yield_descriptor_descendents(child):
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yield module_descriptor
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def yield_module_descendents(module):
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for child in module.get_display_items():
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yield child
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for module in yield_module_descendents(child):
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yield module
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def fast_grade(student, request, course_graded_sections, grader, student_module_cache):
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totaled_scores = {}
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for section_format, sections in course_graded_sections.iteritems():
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format_scores = []
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for section in sections:
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section_descriptor = section['section_descriptor']
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section_name = section_descriptor.metadata.get('display_name')
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should_grade_section = False
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# If we haven't seen a single problem in the section, we don't have to grade it at all! We can assume 0%
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for moduledescriptor in section['xmoduledescriptors']:
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if student_module_cache.lookup(moduledescriptor.category, moduledescriptor.location.url() ):
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should_grade_section = True
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break
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if should_grade_section:
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scores = []
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section_module = get_module(student, request, section_descriptor.location, student_module_cache)
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# TODO: We may be able to speed this up by only getting a list of children IDs from section_module
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# Then, we may not need to instatiate any problems if they are already in the database
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for module in yield_module_descendents(section_module):
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(correct, total) = get_score(student, module, student_module_cache)
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if correct is None and total is None:
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continue
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if settings.GENERATE_PROFILE_SCORES:
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if total > 1:
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correct = random.randrange(max(total - 2, 1), total + 1)
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else:
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correct = total
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graded = module.metadata.get("graded", False)
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if not total > 0:
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#We simply cannot grade a problem that is 12/0, because we might need it as a percentage
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graded = False
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scores.append(Score(correct, total, graded, module.metadata.get('display_name')))
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section_total, graded_total = graders.aggregate_scores(scores, section_name)
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else:
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section_total = Score(0.0, 1.0, False, section_name)
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graded_possible = 1.0 #if s.metadata.get("graded", False) else 0.0
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graded_total = Score(0.0, graded_possible, True, section_name)
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#Add the graded total to totaled_scores
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if graded_total.possible > 0:
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format_scores.append(graded_total)
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totaled_scores[section_format] = format_scores
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grade_summary = grade_summary = grader.grade(totaled_scores)
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return grade_summary
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def grade_sheet(student, course, grader, student_module_cache):
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"""
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This pulls a summary of all problems in the course.
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Returns
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- courseware_summary is a summary of all sections with problems in the course. It is organized as an array of chapters,
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each containing an array of sections, each containing an array of scores. This contains information for graded and ungraded
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problems, and is good for displaying a course summary with due dates, etc.
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Arguments:
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student: A User object for the student to grade
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course: An XModule containing the course to grade
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student_module_cache: A StudentModuleCache initialized with all instance_modules for the student
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"""
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chapters = []
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for c in course.get_children():
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sections = []
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for s in c.get_children():
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graded = s.metadata.get('graded', False)
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scores = []
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for module in yield_module_descendents(s):
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(correct, total) = get_score(student, module, student_module_cache)
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if correct is None and total is None:
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continue
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scores.append(Score(correct, total, graded, module.metadata.get('display_name')))
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section_total, graded_total = graders.aggregate_scores(scores, s.metadata.get('display_name'))
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format = s.metadata.get('format', "")
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sections.append({
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'section': s.metadata.get('display_name'),
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'scores': scores,
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'section_total': section_total,
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'format': format,
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'due': s.metadata.get("due", ""),
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'graded': graded,
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})
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chapters.append({'course': course.metadata.get('display_name'),
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'chapter': c.metadata.get('display_name'),
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'sections': sections})
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return chapters
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def get_score(user, problem, student_module_cache):
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"""
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Return the score for a user on a problem
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user: a Student object
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problem: an XModule
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cache: A StudentModuleCache
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"""
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correct = 0.0
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# If the ID is not in the cache, add the item
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instance_module = get_instance_module(user, problem, student_module_cache)
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# instance_module = student_module_cache.lookup(problem.category, problem.id)
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# if instance_module is None:
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# instance_module = StudentModule(module_type=problem.category,
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# module_state_key=problem.id,
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# student=user,
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# state=None,
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# grade=0,
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# max_grade=problem.max_score(),
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# done='i')
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# cache.append(instance_module)
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# instance_module.save()
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# If this problem is ungraded/ungradable, bail
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if instance_module.max_grade is None:
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return (None, None)
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correct = instance_module.grade if instance_module.grade is not None else 0
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total = instance_module.max_grade
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if correct is not None and total is not None:
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#Now we re-weight the problem, if specified
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weight = getattr(problem, 'weight', 1)
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if weight != 1:
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correct = correct * weight / total
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total = weight
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return (correct, total)
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