回答編集履歴
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answer
CHANGED
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@@ -5,4 +5,61 @@
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user = User.where(id: c.map(&:id))
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```
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じゃ、ダメですか
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じゃ、ダメですか
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```Ruby
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irb(main):042:0> a = User.where(id: [1..3])
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User Load (0.1ms) SELECT "users".* FROM "users" WHERE (("users"."id" BETWEEN 1 AND 3 OR 1=0))
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+----+------+-------------------------+-------------------------+
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| id | name | created_at | updated_at |
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+----+------+-------------------------+-------------------------+
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| 1 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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| 2 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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| 3 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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+----+------+-------------------------+-------------------------+
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3 rows in set
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irb(main):043:0> b = User.where(id: [4..6])
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User Load (0.1ms) SELECT "users".* FROM "users" WHERE (("users"."id" BETWEEN 4 AND 6 OR 1=0))
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+----+------+-------------------------+-------------------------+
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| id | name | created_at | updated_at |
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+----+------+-------------------------+-------------------------+
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| 4 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 5 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 6 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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+----+------+-------------------------+-------------------------+
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3 rows in set
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irb(main):044:0> c = a | b
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+----+------+-------------------------+-------------------------+
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| id | name | created_at | updated_at |
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+----+------+-------------------------+-------------------------+
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| 1 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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| 2 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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| 3 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 4 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 5 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 6 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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+----+------+-------------------------+-------------------------+
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6 rows in set
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irb(main):045:0> user = User.where(id: c.map(&:id))
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User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" IN (1, 2, 3, 4, 5, 6)
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+----+------+-------------------------+-------------------------+
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| id | name | created_at | updated_at |
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+----+------+-------------------------+-------------------------+
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| 1 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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| 2 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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| 3 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 4 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 5 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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| 6 | hoge | 2018-05-20 05:32:59 UTC | 2018-05-20 05:32:59 UTC |
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+----+------+-------------------------+-------------------------+
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6 rows in set
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irb(main):046:0> user.where(id: 1)
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User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" IN (1, 2, 3, 4, 5, 6) AND "users"."id" = 1
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+----+------+-------------------------+-------------------------+
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| id | name | created_at | updated_at |
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+----+------+-------------------------+-------------------------+
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| 1 | hoge | 2018-05-20 05:32:58 UTC | 2018-05-20 05:32:58 UTC |
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+----+------+-------------------------+-------------------------+
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1 row in set
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```
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