例 rails4 IDで検索 Page.find(1) # SELECT "pages".* FROM "pages" WHERE "pages"."id" = 1 LIMIT 1 複数の項目をIDで検索 Page.find([1, 2]) # SELECT "pages".* FROM "pages" WHERE "pages"."id" IN (1, 2) rails3 IDで検索 Page.find(1) # SELECT "pages".* FROM "pages" WHERE "pages"."id" = 1 LIMIT 1 複数の項目をIDで検索 Page.find([1, 2]) # SELECT "pages".* FROM "pages" WHERE "pages"."id" IN (1, 2) すべての項目を取得 Page.find(:all) # SELECT "pa