Comments (2)
I can only speak for Rails 2.3 (I haven't worked with rails anymore in the last few years), but the ActiveRecord cache needs to be reloaded there. Did you start your console in production
environment? I don't think that caching is activate in development
.
The only time it gets really critical is when a migration drops columns though, as ActiveRecord will spit out exceptions in this case. Back in the days when I worked on a bigger rails service using LHM, we came up with something which would wrap the ActiveRecord::Base#create
method, rescue ActiveRecord::StatementInvalid
exceptions matching /Mysql::Error: Unknown column '(\w+)' in 'field list'/
and calling <Model>.reset_column_information
.
Besides that edge case where ARs caching mechanism gets in the way, I'd recommend to write code in a way that it can deal with pre- and post-migration SQL tables. Then it doesn't matter when instances get restarted and migration can happen at any point.
Does this help?
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Yeah. Thanks
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Related Issues (20)
- Run ANALYZE TABLE after table copy HOT 5
- support for sequel? HOT 1
- Feature request: Support tables with gaps in the primary key column 'id' HOT 1
- lock_wait_timeout is readonly in older versions of SQL
- Any release coming that includes the slave_lag throttler? HOT 6
- Calculate Stride Size dynamically to avoid DeadLocks HOT 2
- How well does LHM play with Galera clusters? HOT 1
- Feature Request: Verification Step HOT 2
- Forgotten line HOT 2
- Completion percentage is wrong when IDs don't start at 1 HOT 2
- Undefined method 'rename_table' for Lhm
- Replication problems when running LHM
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- table_exists deprecation warning
- LHM doesn't copy data when only 1 row and ID isn't 1 HOT 3
- Flag the repo as unmaintained? HOT 4
- Is there a way to get the no of records that were updated?
- p
- During LHM migration, Table is getting locked for bigger table and all our connections are holding up HOT 1
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