discourse/db/migrate/20140815191556_fix_post_act...

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class FixPostActionsIndexAgain < ActiveRecord::Migration
def change
remove_index "post_actions", name: "idx_unique_actions"
add_index "post_actions",
["user_id", "post_action_type_id",
"post_id", "targets_topic"],
name: "idx_unique_actions",
unique: true,
where: 'deleted_at IS NULL AND disagreed_at IS NULL AND deferred_at IS NULL'
end
end