Transformation of query to active record

问题

To perform a range query we follow something akin to the syntax below -:

oms[:order_items].where(:internal_sla => 3..5) results in this query
 => #<Sequel::Mysql2::Dataset: "SELECT * FROM `order_items` WHERE ((`internal_sla` >= 3) AND (`internal_sla` <= 5))"> 

But how can I change the active record query to give me something like this => select internal_sla from order_items where (internal_sla<=3 and internal_sla>=0) OR (internal_sla<=15 and internal_sla>=10)

回答1:

.where("(internal_sla >= ? AND internal_sla <= ? OR 
internal_sla >= ? AND internal_sla <= ? )", 0, 3, 10, 15).pluck(:internal_sla)

UPDATE after comment:

If internal_sla is integer, you can:

.where(:internal_sla => (0..3).to_a + (10..15).to_a).pluck(:internal_sla)

edit: fixed typo

回答2:

This works

oms[:order_items].where(:internal_sla => [0..3, 10..15])

来源：https://stackoverflow.com/questions/15517286/transformation-of-query-to-active-record