#30591: MySQL: 1215 - "Cannot add foreign key constraint" when altering type of
unique field referenced by ForeignKey.
----------------------------------+------------------------------------
     Reporter:  Cornelis Poppema  |                    Owner:  nobody
         Type:  Bug               |                   Status:  new
    Component:  Migrations        |                  Version:  master
     Severity:  Normal            |               Resolution:
     Keywords:                    |             Triage Stage:  Accepted
    Has patch:  0                 |      Needs documentation:  0
  Needs tests:  0                 |  Patch needs improvement:  0
Easy pickings:  0                 |                    UI/UX:  0
----------------------------------+------------------------------------
Changes (by felixxm):

 * version:  2.2 => master
 * stage:  Unreviewed => Accepted


Comment:

 Thanks for detailed report. #30152 is related but it doesn't fix the main
 issue. I attached tests for both scenarios.

 Reproduced at 8454f6dea49dddb821bfcb7569ea222bb487dfd1.

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Ticket URL: <https://code.djangoproject.com/ticket/30591#comment:1>
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