Tests that each student has a fixed amount of time, relative to their
course start date, in which to submit the assignment, and that teachers
are shown the dates relative to each student when grading.
Couple of changes:
- The duedate, cutoffdate and allowsubmissionsfromdate are now always
shown for relative dates courses.
- When relative dates mode is enabled, calculate and apply the enrolment
start offset to the due date in SQL. No changes to col_duedate needed.
Sorting is supported.
The 'Status' column is sorted using 'status ASC/DESC, userid ASC',
where status does not contain the due date. Overdue assignments
have additional information displayed, but this is unrelated to
the sort, meaning we don't need to change anything with sorting.
Returns a formatted string representation of the difference between two
timestamps, defaulting to 'Xd Xh Xm' format, but supporting custom
format strings containing any chars from:
https://www.php.net/manual/en/dateinterval.format.php.
Changes include:
- Added a private method calculate_properties(), which calculates
per-user instance properties and stores them in an instance var.
- get_instance() now takes a userid param, and calls the
calculate_properties() method, allowing per-user instances to be
returned.
- Added a public method get_default_instance(), which returns the
non-augmented instance data (no per-user properties), so we can
still get back the raw instance data when needed.
- The get_course method has been changed to make sure we always have an
object property, not a string - which happened in some cases (when
commenting on the assign submission page, for example).
The file picker template included an img with a src of "#". When the
template was loaded into the modal, the browser fetches the img src, but
it's immediately removed as that section is only used as an in-place
template. The src tag does not need to be present.
It's more memory efficient to use `pg_fetch_assoc` for each row than to
call `pg_fetch_all` and release memory immediately. This is because we
can treat the assoc fetch like an iterator and it only fetches the
current record into memory one at a time, whilst the all fetch fetches
all records and never unsets them. Attempting to unset them is extremely
time consuming.
