rake db:migrate:redo executes db:structure:dump only once

[Arsen7]

In current branch 3-2-stable, when config.active_record.schema_format = :sql, the task rake db:migrate:redo dumps the database structure just after the first migration is rolled back, and never calls it again, so you are left with invalid structure file.

Apparently the task db:_dump is reset properly, but the task db:structure:dump is not, what may be seen in the last line of the trace:

rake db:migrate:redo --trace
** Invoke db:migrate:redo (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
** Execute db:migrate:redo
** Invoke db:rollback (first_time)
** Invoke environment 
** Invoke db:load_config 
** Execute db:rollback
** Invoke db:_dump (first_time)
** Execute db:_dump
** Invoke db:structure:dump (first_time)
** Invoke environment 
** Execute db:structure:dump
** Invoke db:migrate (first_time)
** Invoke environment 
** Invoke db:load_config 
** Execute db:migrate
==  CreateSessions: migrating =================================================
-- create_table(:sessions)
NOTICE:  CREATE TABLE will create implicit sequence [...]
==  CreateSessions: migrated (0.1163s) ========================================

** Invoke db:_dump (first_time)
** Execute db:_dump
** Invoke db:structure:dump 

[kennyj]

I can reproduce this issue. and I realize the cause of problem.
schema:dump and _dump are reenable, but structure:dump is not reenable in the current implement.
I'm going to this issue.

[kennyj]

I think that I fixed this issue.
Please test it :-)

[kennyj]

I confirmed that this issue is solved on 3-2-stable.
Anyway, I'll send a PR :)