[MDL-58539] Group submissions with annotated PDF fails (attemptnumber null value issue) - Moodle Tracker

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Testing Instructions:
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(seamlessly taken from ~~MDL-47123~~)
1. Create an assignment activity with the settings:

Students submit in groups - Yes

Require all group members submit - No

2. As a student, submit a pdf assignment file.
3. Grade this group submission, and include an annotated PDF while grading
4. When returning to the "View/grade all submissions" page you should see the grading page (not "Error writing to database" error).
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(seamlessly taken from MDL-47123 ) 1. Create an assignment activity with the settings: Students submit in groups - Yes Require all group members submit - No 2. As a student, submit a pdf assignment file. 3. Grade this group submission, and include an annotated PDF while grading 4. When returning to the "View/grade all submissions" page you should see the grading page (not "Error writing to database" error).
Affected Branches:
MOODLE_31_STABLE, MOODLE_32_STABLE, MOODLE_33_STABLE
Fixed Branches:
MOODLE_31_STABLE, MOODLE_32_STABLE
Pull from Repository:
https://github.com/dmonllao/moodle.git
Pull Master Branch:
~~MDL-58539~~_master
Pull Master Diff URL:
https://github.com/dmonllao/moodle/compare/MDL-58539_master~...MDL-58539_master

This seems to be an issue originally fixed in ~~MDL-44304~~, but then re-introduced in ~~MDL-45969~~.

The issue appearance is identical to -~~MDL-44304~~-

ERROR: null value in column "attemptnumber" violates not-null constraint

duplicates

MDL-44304 Trainer can not access grading view (ERROR: null value in column "attemptnumber" violates not-null constraint)

is a regression caused by

MDL-45969 Edit PDF always shows the latest attempt (online version).