带有数组的Rails ActiveRecord find_by

Question

我的rails应用程序中有一个Blacklist表，下面是在rails console中运行命令时其中的示例数据：

# rails console
Blacklist.all

#<Blacklist id: 1, auth_tokens: ["abc", "abc1", "abc2"], user_id: 2, created_at: "..", updated_at: "..">
#<Blacklist id: 2, auth_tokens: ["xyz", "xyz1", "xyz2"], user_id: 1, created_at: "..", updated_at: "..">

当我跑步时：

# rails console
Blacklist.find_by(auth_tokens: "abc")
# returns nil

现在，我要查找包含值auth_token-"abc"->的黑名单，即查询应返回ID为1的Blacklist。如何实现呢？

编辑：schema.rb文件

create_table "blacklists", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
    t.text "auth_tokens"
    t.integer "user_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

然后auth_tokens在Model中进行序列化：

# Blacklist model
serialize :auth_tokens

after_initialize do |blacklist|
  blacklist.auth_tokens = [] if blacklist.auth_tokens == nil
end