discourse/db/migrate/20120812235417_retire_expre...

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class RetireExpressions < ActiveRecord::Migration[4.2]
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def up
execute 'insert into post_actions (post_action_type_id, user_id, post_id, created_at, updated_at)
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select
case
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when expression_index=1 then 3
when expression_index=2 then 4
when expression_index=3 then 2
end
, user_id, post_id, created_at, updated_at from expressions'
drop_table 'expressions'
drop_table 'expression_types'
end
def down
raise ActiveRecord::IrreversibleMigration
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end
end