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16 lines
430 B
Ruby
16 lines
430 B
Ruby
class DropGroupManagers < ActiveRecord::Migration[4.2]
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def up
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# old data under old structure
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execute "UPDATE group_users SET owner = true
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WHERE exists (SELECT 1 FROM group_managers m
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WHERE m.group_id = group_users.group_id AND
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m.user_id = group_users.user_id)"
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drop_table "group_managers"
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end
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def down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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