228 lines
8.8 KiB
Python
228 lines
8.8 KiB
Python
from datetime import timedelta
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from contentstore.utils import get_modulestore
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from xmodule.modulestore.django import loc_mapper
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from xblock.fields import Scope
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class CourseGradingModel(object):
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"""
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Basically a DAO and Model combo for CRUD operations pertaining to grading policy.
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"""
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# Within this class, allow access to protected members of client classes.
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# This comes up when accessing kvs data and caches during kvs saves and modulestore writes.
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def __init__(self, course_descriptor):
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self.graders = [
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CourseGradingModel.jsonize_grader(i, grader) for i, grader in enumerate(course_descriptor.raw_grader)
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] # weights transformed to ints [0..100]
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self.grade_cutoffs = course_descriptor.grade_cutoffs
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self.grace_period = CourseGradingModel.convert_set_grace_period(course_descriptor)
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@classmethod
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def fetch(cls, course_locator):
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"""
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Fetch the course grading policy for the given course from persistence and return a CourseGradingModel.
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_locator)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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model = cls(descriptor)
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return model
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@staticmethod
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def fetch_grader(course_location, index):
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"""
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Fetch the course's nth grader
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Returns an empty dict if there's no such grader.
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_location)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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index = int(index)
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if len(descriptor.raw_grader) > index:
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return CourseGradingModel.jsonize_grader(index, descriptor.raw_grader[index])
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# return empty model
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else:
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return {"id": index,
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"type": "",
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"min_count": 0,
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"drop_count": 0,
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"short_label": None,
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"weight": 0
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}
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@staticmethod
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def update_from_json(course_locator, jsondict, user):
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"""
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Decode the json into CourseGradingModel and save any changes. Returns the modified model.
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Probably not the usual path for updates as it's too coarse grained.
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_locator)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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graders_parsed = [CourseGradingModel.parse_grader(jsonele) for jsonele in jsondict['graders']]
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descriptor.raw_grader = graders_parsed
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descriptor.grade_cutoffs = jsondict['grade_cutoffs']
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get_modulestore(course_old_location).update_item(descriptor, user.id)
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CourseGradingModel.update_grace_period_from_json(course_locator, jsondict['grace_period'], user)
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return CourseGradingModel.fetch(course_locator)
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@staticmethod
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def update_grader_from_json(course_location, grader, user):
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"""
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Create or update the grader of the given type (string key) for the given course. Returns the modified
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grader which is a full model on the client but not on the server (just a dict)
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_location)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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# parse removes the id; so, grab it before parse
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index = int(grader.get('id', len(descriptor.raw_grader)))
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grader = CourseGradingModel.parse_grader(grader)
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if index < len(descriptor.raw_grader):
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descriptor.raw_grader[index] = grader
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else:
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descriptor.raw_grader.append(grader)
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get_modulestore(course_old_location).update_item(descriptor, user.id)
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return CourseGradingModel.jsonize_grader(index, descriptor.raw_grader[index])
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@staticmethod
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def update_cutoffs_from_json(course_location, cutoffs, user):
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"""
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Create or update the grade cutoffs for the given course. Returns sent in cutoffs (ie., no extra
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db fetch).
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_location)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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descriptor.grade_cutoffs = cutoffs
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get_modulestore(course_old_location).update_item(descriptor, user.id)
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return cutoffs
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@staticmethod
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def update_grace_period_from_json(course_location, graceperiodjson, user):
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"""
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Update the course's default grace period. Incoming dict is {hours: h, minutes: m} possibly as a
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grace_period entry in an enclosing dict. It is also safe to call this method with a value of
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None for graceperiodjson.
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_location)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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# Before a graceperiod has ever been created, it will be None (once it has been
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# created, it cannot be set back to None).
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if graceperiodjson is not None:
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if 'grace_period' in graceperiodjson:
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graceperiodjson = graceperiodjson['grace_period']
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grace_timedelta = timedelta(**graceperiodjson)
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descriptor.graceperiod = grace_timedelta
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get_modulestore(course_old_location).update_item(descriptor, user.id)
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@staticmethod
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def delete_grader(course_location, index, user):
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"""
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Delete the grader of the given type from the given course.
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_location)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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index = int(index)
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if index < len(descriptor.raw_grader):
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del descriptor.raw_grader[index]
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# force propagation to definition
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descriptor.raw_grader = descriptor.raw_grader
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get_modulestore(course_old_location).update_item(descriptor, user.id)
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@staticmethod
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def delete_grace_period(course_location, user):
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"""
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Delete the course's grace period.
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"""
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course_old_location = loc_mapper().translate_locator_to_location(course_location)
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descriptor = get_modulestore(course_old_location).get_item(course_old_location)
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del descriptor.graceperiod
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get_modulestore(course_old_location).update_item(descriptor, user.id)
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@staticmethod
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def get_section_grader_type(location):
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old_location = loc_mapper().translate_locator_to_location(location)
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descriptor = get_modulestore(old_location).get_item(old_location)
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return {
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"graderType": descriptor.format if descriptor.format is not None else 'notgraded',
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"location": unicode(location),
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}
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@staticmethod
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def update_section_grader_type(descriptor, grader_type, user):
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if grader_type is not None and grader_type != u'notgraded':
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descriptor.format = grader_type
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descriptor.graded = True
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else:
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del descriptor.format
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del descriptor.graded
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get_modulestore(descriptor.location).update_item(descriptor, user.id)
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return {'graderType': grader_type}
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@staticmethod
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def convert_set_grace_period(descriptor):
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# 5 hours 59 minutes 59 seconds => converted to iso format
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rawgrace = descriptor.graceperiod
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if rawgrace:
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hours_from_days = rawgrace.days * 24
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seconds = rawgrace.seconds
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hours_from_seconds = int(seconds / 3600)
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hours = hours_from_days + hours_from_seconds
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seconds -= hours_from_seconds * 3600
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minutes = int(seconds / 60)
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seconds -= minutes * 60
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graceperiod = {'hours': 0, 'minutes': 0, 'seconds': 0}
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if hours > 0:
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graceperiod['hours'] = hours
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if minutes > 0:
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graceperiod['minutes'] = minutes
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if seconds > 0:
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graceperiod['seconds'] = seconds
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return graceperiod
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else:
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return None
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@staticmethod
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def parse_grader(json_grader):
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# manual to clear out kruft
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result = {"type": json_grader["type"],
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"min_count": int(json_grader.get('min_count', 0)),
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"drop_count": int(json_grader.get('drop_count', 0)),
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"short_label": json_grader.get('short_label', None),
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"weight": float(json_grader.get('weight', 0)) / 100.0
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}
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return result
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@staticmethod
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def jsonize_grader(i, grader):
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grader['id'] = i
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if grader['weight']:
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grader['weight'] *= 100
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if not 'short_label' in grader:
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grader['short_label'] = ""
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return grader
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