#33169: Migrations crashes with long identifiers on MySQL (8.0.26 )
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Reporter: Awais Qureshi | Owner: nobody
Type: Bug | Status: closed
Component: Migrations | Version: 3.2
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage:
django32,mysql8.0.26 | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Awais Qureshi):
It's not a django issue. as per mysql8.0
[https://dev.mysql.com/doc/refman/8.0/en/identifier-length.html]
`For constraint definitions that include no constraint name, the server
internally generates a name derived from the associated table name. For
example, internally generated foreign key and CHECK constraint names
consist of the table name plus _ibfk_ or _chk_ and a number. If the table
name is close to the length limit for constraint names, the additional
characters required for the constraint name may cause that name to exceed
the limit, resulting in an error.`
My model is as follows
class BlackboardLearnerAssessmentDataTransmissionAudit(models.Model):
enterprise_course_enrollment_id = models.PositiveIntegerField(
blank=False,
null=False,
db_index=True
)
In mysql8 it generate this query with a check
`enterprise_cou_enrollment_id` integer UNSIGNED NOT NULL CHECK
(`enterprise_cou_enrollment_id` >= 0) having this name
`blackboard_blackboardlearnerassessmentdatatransmissionaudit_chk_1` ( 65
characters ) and it throws the error.
--
Ticket URL: <https://code.djangoproject.com/ticket/33169#comment:11>
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