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class RemoveTodosForDeletedIssues < ActiveRecord::Migration[4.2]
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def up
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execute <<-SQL
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DELETE FROM todos
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WHERE todos.target_type = 'Issue'
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AND NOT EXISTS (
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SELECT *
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FROM issues
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WHERE issues.id = todos.target_id
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AND issues.deleted_at IS NULL
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)
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SQL
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end
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def down
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end
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end
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