97a847d943
This updates the migration to have one index on student_module_id. Previously we had one index on stage and production of edx.org but two indexes on other envs. This change is to make sure we have one index on every env. But this change drops the index and create a new index, so if you have set ENABLE_CSMH_EXTENDED to True and have coursewarehistoryextended_studentmodulehistoryextended in a separate db and you want to avoid rebuilding the index, you can fake this migration.
70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
"""
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WE'RE USING MIGRATIONS!
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If you make changes to this model, be sure to create an appropriate migration
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file and check it in at the same time as your model changes. To do that,
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1. Go to the edx-platform dir
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2. ./manage.py schemamigration courseware --auto description_of_your_change
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3. Add the migration file created in edx-platform/lms/djangoapps/coursewarehistoryextended/migrations/
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ASSUMPTIONS: modules have unique IDs, even across different module_types
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"""
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from django.db import models
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from django.db.models.signals import post_delete, post_save
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from django.dispatch import receiver
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from lms.djangoapps.courseware.models import BaseStudentModuleHistory, StudentModule
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from lms.djangoapps.courseware.fields import UnsignedBigIntAutoField
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class StudentModuleHistoryExtended(BaseStudentModuleHistory):
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"""Keeps a complete history of state changes for a given XModule for a given
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Student. Right now, we restrict this to problems so that the table doesn't
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explode in size.
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This new extended CSMH has a larger primary key that won't run out of space
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so quickly."""
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class Meta:
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app_label = 'coursewarehistoryextended'
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get_latest_by = "created"
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indexes = [
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models.Index(
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fields=['student_module'],
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name="student_module_idx"
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),
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]
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id = UnsignedBigIntAutoField(primary_key=True) # pylint: disable=invalid-name
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student_module = models.ForeignKey(StudentModule, db_index=False, db_constraint=False, on_delete=models.DO_NOTHING)
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@receiver(post_save, sender=StudentModule)
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def save_history(sender, instance, **kwargs): # pylint: disable=no-self-argument, unused-argument
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"""
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Checks the instance's module_type, and creates & saves a
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StudentModuleHistoryExtended entry if the module_type is one that
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we save.
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"""
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BaseStudentModuleHistory.save_history_entry(
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instance,
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StudentModuleHistoryExtended,
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"lms.djangoapps.coursewarehistoryextended.models.student_module_history_extended_map"
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)
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@receiver(post_delete, sender=StudentModule)
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def delete_history(sender, instance, **kwargs): # pylint: disable=no-self-argument, unused-argument
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"""
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Django can't cascade delete across databases, so we tell it at the model level to
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on_delete=DO_NOTHING and then listen for post_delete so we can clean up the CSMHE rows.
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"""
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StudentModuleHistoryExtended.objects.filter(student_module=instance).all().delete()
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def __str__(self):
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return str(repr(self))
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