> ap Feedback.pluck(:feedback_type).uniq
(4.5ms) SELECT `feedbacks`.`feedback_type` FROM `feedbacks` WHERE `feedbacks`.`is_invalidated` = 0 AND `feedbacks`.`is_ignored` = 0
[
[ 0] "fpo",
[ 1] "fpu",
[ 2] "fp",
[ 3] "tpu-",
[ 4] "tpu",
[ 5] "tp",
[ 6] "fp-",
[ 7] "tpu-spam",
[ 8] "tp-",
[ 9] "fpu-",
[10] "tpu=",
[11] "fpi-",
[12] "true",
[13] "false",
[14] "trueu",
[15] "trueu-",
[16] "false-",
[17] "falseu",
[18] "true-",