#30591: MySQL: 1215 - "Cannot add foreign key constraint" when altering type of
unique field referenced by ForeignKey.
----------------------------------+--------------------------------------
     Reporter:  Cornelis Poppema  |                    Owner:  Adnan Umer
         Type:  Bug               |                   Status:  assigned
    Component:  Migrations        |                  Version:  master
     Severity:  Normal            |               Resolution:
     Keywords:                    |             Triage Stage:  Accepted
    Has patch:  1                 |      Needs documentation:  0
  Needs tests:  0                 |  Patch needs improvement:  1
Easy pickings:  0                 |                    UI/UX:  0
----------------------------------+--------------------------------------

Comment (by GitHub <noreply@…>):

 In [changeset:"579909a13feb958f75d1d77e9995cef8f2b9c2a3" 579909a1]:
 {{{
 #!CommitTicketReference repository=""
 revision="579909a13feb958f75d1d77e9995cef8f2b9c2a3"
 Refs #30591 -- Fixed introspection of check and unique column constraints
 on MariaDB.

 Unnamed unique and check columns constraints have the same name as
 a column. Ensure uniqueness by using custom names.

 Thanks Adnan Umer for the report.
 }}}

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Ticket URL: <https://code.djangoproject.com/ticket/30591#comment:5>
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