如何解决Rails中重复的IN SQL查询
在Rails的where调用中没有重复的ID是否更快更好? 例如,
Vehicle.where(account_id: [1,10,11,11])
将产生SQL查询
SELECT "vehicles".* FROM "vehicles" WHERE "vehicles"."deleted_at" IS NULL AND "vehicles"."account_id" IN (1,11)
我得到的过滤器来自2个数组的组合,不幸的是第一个数组是一个字符串:( 所以如果我不想重复的值,我就必须这样做:
Vehicle.where(account_id: array1.map(&:to_i)|array2)
# for example,array1 is ["10","9"] and array2 [10,8]
# will become [10,9,8]
我想知道我是否不应该为重复的值而烦恼?对性能有影响吗?
Vehicle.where(account_id: array1.concat(array2))
# will become where(account_id: ["10","9",8]
# SELECT "vehicles".* FROM "vehicles" WHERE "vehicles"."deleted_at" IS NULL AND "vehicles"."account_id" IN (10,8)
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