Re: [Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
---+
 Reporter:  Daniel Hahler  |Owner:  Windson yang
 Type:  Bug|   Status:  closed
Component:  Migrations |  Version:  1.11
 Severity:  Normal |   Resolution:  needsinfo
 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 Tim Graham):

 * status:  assigned => closed
 * resolution:   => needsinfo


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Re: [Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
---+
 Reporter:  Daniel Hahler  |Owner:  Windson yang
 Type:  Bug|   Status:  assigned
Component:  Migrations |  Version:  1.11
 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
---+

Comment (by Windson yang):

 I need more details to fix this bug.

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Re: [Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
---+
 Reporter:  Daniel Hahler  |Owner:  Windson yang
 Type:  Bug|   Status:  assigned
Component:  Migrations |  Version:  1.11
 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 Windson yang):

 * status:  new => assigned
 * owner:  nobody => Windson yang


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Ticket URL: 
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Re: [Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
---+
 Reporter:  Daniel Hahler  |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  Migrations |  Version:  1.11
 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 Tim Graham):

 * stage:  Unreviewed => Accepted


Comment:

 Tentatively accepting. Might be difficult to proceed without steps to
 reproduce unless you plan to offer a patch.

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Re: [Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
---+--
 Reporter:  Daniel Hahler  |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  Migrations |  Version:  1.11
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--

Comment (by Daniel Hahler):

 Not currently.

 I think a fix might be to move over the `replaces` from the node that gets
 replaced, and/or only to replace up to the parent that got applied in
 
https://github.com/django/django/blob/a6756195c1a11eee10c16c96fe95d52e22e1d9ba/django/db/migrations/graph.py#L243-L245.

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Re: [Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
---+--
 Reporter:  Daniel Hahler  |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  Migrations |  Version:  1.11
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--

Comment (by Tim Graham):

 Can you provide more explicit steps to reproduce the problematic
 situation?

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[Django] #28351: "Conflicting migrations detected" CommandError due to replacement Migration being removed

[Django]

#28351: "Conflicting migrations detected" CommandError due to replacement 
Migration
being removed
-+
   Reporter:  Daniel Hahler  |  Owner:  nobody
   Type:  Bug| Status:  new
  Component:  Migrations |Version:  1.11
   Severity:  Normal |   Keywords:
   Triage Stage:  Unreviewed |  Has patch:  0
Needs documentation:  0  |Needs tests:  0
Patch needs improvement:  0  |  Easy pickings:  0
  UI/UX:  0  |
-+
 I am getting the following error:
 {{{
 CommandError: Conflicting migrations detected; multiple leaf nodes in the
 migration graph: (0002_initial_models, 0XXX_merge_20170628_1435 in myapp).
 To fix them run 'python manage.py makemigrations --merge'
 }}}

 Running the command results in `No conflicts detected to merge.` however.

 `0002_initial_models` is not actually a leaf node, but `0003_initial_data`
 depends on it.
 `0003_initial_data` however is removed, since it replaces
 `0XXX_merge_20170628_1435`, which is not applied yet and therefore also
 does not show up in `showmigrations`?!
 (it gets removed in
 
https://github.com/django/django/blob/a6756195c1a11eee10c16c96fe95d52e22e1d9ba/django/db/migrations/graph.py#L252)

 I think `0003_initial_data` should still show up in `showmigrations`, but
 with some indication that it replaces other migrations.
 That would happen in case it wasn't removed as a leaf node in
 
https://github.com/django/django/blob/a6756195c1a11eee10c16c96fe95d52e22e1d9ba/django/core/management/commands/showmigrations.py#L82-L83.

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