135 lines
4.7 KiB
Python
135 lines
4.7 KiB
Python
import random
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import logging
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from django.conf import settings
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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 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. It returns a dictionary
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with two datastructures:
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- courseware_summary is a summary of all sections with problems in the
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course. It is organized as an array of chapters, each containing an array of
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sections, each containing an array of scores. This contains information for
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graded and ungraded problems, and is good for displaying a course summary
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with due dates, etc.
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- grade_summary is the output from the course grader. More information on
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the format is in the docstring for CourseGrader.
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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
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instance_modules for the student
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"""
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totaled_scores = {}
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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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def yield_descendents(module):
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yield module
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for child in module.get_display_items():
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for module in yield_descendents(child):
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yield module
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graded = s.metadata.get('graded', False)
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scores = []
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for module in yield_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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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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if not total > 0:
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#We simply cannot grade a problem that is 12/0, because we
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#might need it as a percentage
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graded = False
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scores.append(Score(correct, total, graded,
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module.metadata.get('display_name')))
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section_total, graded_total = graders.aggregate_scores(
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scores, s.metadata.get('display_name'))
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#Add the graded total to totaled_scores
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format = s.metadata.get('format', "")
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if format and graded_total.possible > 0:
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format_scores = totaled_scores.get(format, [])
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format_scores.append(graded_total)
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totaled_scores[format] = format_scores
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sections.append({
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'display_name': s.display_name,
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'url_name': s.url_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.display_name,
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'display_name': c.display_name,
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'url_name': c.url_name,
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'sections': sections})
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grade_summary = grader.grade(totaled_scores)
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return {'courseware_summary': chapters,
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'grade_summary': grade_summary}
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def get_score(user, problem, 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 = 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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