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Shift enroll/unenroll logic to CourseEnrollment model, add is_active and mode.

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Features coming down the pipe will want to be able to:
* Refer to enrollments before they are actually activated (approval step).
* See what courses a user used to be enrolled in for when they re-enroll in
  the same course, or a different run of that course.
* Have different "modes" of enrolling in a course, representing things like
  honor certificate enrollment, auditing (no certs), etc.

This change adds an is_active flag and mode (with default being "honor").
The commit is only as large as it is because many parts of the codebase were
manipulating enrollments by adding and removing CourseEnrollment objects
directly. It was necessary to create classmethods on CourseEnrollment to
encapsulate this functionality and then port everything over to using them.

The migration to add columns has been tested on a prod replica, and seems to be
fine for running on a live system with single digit millions of rows of
enrollments.
This commit is contained in:
David Ormsbee
2013-08-12 09:20:13 -04:00
parent cd838e2652
commit 3ce87583ab
32 changed files with 733 additions and 143 deletions
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9
docs/data/source/internal_data_formats/sql_schema.rst
View File

@@ -347,7 +347,7 @@ There is an important split in demographic data gathered for the students who si
`student_courseenrollment`
==========================
A row in this table represents a student's enrollment for a particular course run. If they decide to unenroll in the course, we delete their entry in this table, but we still leave all their state in `courseware_studentmodule` untouched.
A row in this table represents a student's enrollment for a particular course run. If they decide to unenroll in the course, we set `is_active` to `False`. We still leave all their state in `courseware_studentmodule` untouched, so they will not lose courseware state if they unenroll and reenroll.
`id`
----
@@ -365,6 +365,13 @@ A row in this table represents a student's enrollment for a particular course ru
---------
Datetime of enrollment, UTC.
`is_active`
-----------
Boolean indicating whether this enrollment is active. If an enrollment is not active, a student is not enrolled in that course. This lets us unenroll students without losing a record of what courses they were enrolled in previously. This was introduced in the 2013-08-20 release. Before this release, unenrolling a student simply deleted the row in `student_courseenrollment`.
`mode`
------
String indicating what kind of enrollment this was. The default is "honor" (honor certificate) and all enrollments prior to 2013-08-20 will be of that type. Other types being considered are "audit" and "verified_id".
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