3
를 생성 SQL :활동 기록은 명령</p> <pre><code>Fight.last.fight_logs.where(item_id: nil) </code></pre> <p>다음 빈 배열
Fight Load (0.3ms) SELECT "fights".* FROM "fights" ORDER BY "fights"."id" DESC LIMIT $1 [["LIMIT", 1]]
FightLog Load (0.2ms) SELECT "fight_logs".* FROM "fight_logs" WHERE "fight_logs"."fight_id" = $1 AND "fight_logs"."item_id" IS NULL LIMIT $2 [["fight_id", 27], ["LIMIT", 11]]
반환 :
#<ActiveRecord::AssociationRelation [#<FightLog id: 30, fight_id: 27, attack: 0, block: 0, item_id: nil, user_id: 1, damage: 11.0, created_at: "2017-11-02 16:20:55", updated_at: "2017-11-02 16:20:57">, #<FightLog id: 31, fight_id: 27, attack: 0, block: 0, item_id: nil, user_id: 20, damage: 3.0, created_at: "2017-11-02 16:20:57", updated_at: "2017-11-02 16:20:57">, #<FightLog id: 33, fight_id: 27, attack: 0, block: 0, item_id: nil, user_id: 1, damage: 1.0, created_at: "2017-11-02 16:21:40", updated_at: "2017-11-02 16:21:40">, #<FightLog id: 32, fight_id: 27, attack: 0, block: 0, item_id: nil, user_id: 20, damage: 7.0, created_at: "2017-11-02 16:21:33", updated_at: "2017-11-02 16:21:40">, #<FightLog id: 34, fight_id: 27, attack: 0, block: 0, item_id: nil, user_id: 1, damage: 12.0, created_at: "2017-11-02 16:21:47", updated_at: "2017-11-02 16:21:48">, #<FightLog id: 35, fight_id: 27, attack: 0, block: 0, item_id: nil, user_id: 20, damage: 14.0, created_at: "2017-11-02 16:21:48", updated_at: "2017-11-02 16:21:48">]>
하지만
Fight.last.fight_logs.where.not(item_id: 1)
Fight Load (1.0ms) SELECT "fights".* FROM "fights" ORDER BY "fights"."id" DESC LIMIT $1 [["LIMIT", 1]]
FightLog Load (0.8ms) SELECT "fight_logs".* FROM "fight_logs" WHERE "fight_logs"."fight_id" = $1 AND ("fight_logs"."item_id" != $2) LIMIT $3 [["fight_id", 27], ["item_id", 1], ["LIMIT", 11]]
반환 : 가능 얼마나
#<ActiveRecord::AssociationRelation []>
는 SQL 생성? 내가 뭘 잘못하고있어?
당신은 당신이 당신의 데이터베이스에이 있기 때문에 쿼리에NULL
값을 지정해야합니다
@MrYoshiji'당신은 해시 객체를 # 또는로 전달했습니다. 대신 ActiveRecord :: Relation 객체를 전달하십시오. – Src
@MrYoshiji Using Rails 5 – Src
@Src는'.or (Flight.last.flight_logs.where (item_id : nil))'을 사용합니다 (이 범위를 변수에 저장할 수 있습니다). – MrYoshiji