使用 AJAX 更新期望字符串数组的 Rails 列答案

【问题标题】：Update Rails column that expects array of strings using AJAX使用 AJAX 更新期望字符串数组的 Rails 列
【发布时间】：2018-08-27 12:18:47
【问题描述】：

我正在尝试使用 Ruby on Rails 和 AJAX 调用构建一个选择您自己的冒险游戏，其中游戏是用户拥有的资源，并且每个游戏都有一个句子列，需要一个字符串数组。

game {
  id: 16,
  sentences: ['hello', 'world']
}

当作为 AJAX 补丁请求中的数据传入时，上述内容不起作用（尽管我得到 200 好的），hail-mary 版本也不起作用：

game {
id: 16,
sentences: 'hello'
}

rails 本地服务器声明句子是不允许的参数。

      started PATCH "/games/21" for ::1 at 2018-03-18 21:11:12 -0400
    Processing by GamesController#update as */*
    Parameters: {"game"=>{"id"=>"21", "sentences"=>["This is it: the end. You were wrong."]}, "id"=>"21"}
    User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."token" = $1 LIMIT $2  [["token", "8efb6bc10343a4415f6cbcb16d5184f2"], ["LIMIT", 1]]
    Game Load (0.4ms)  SELECT  "games".* FROM "games" WHERE "games"."user_id" = $1 AND "games"."id" = $2 LIMIT $3  [["user_id", 2], ["id", 21], ["LIMIT", 1]]
    Unpermitted parameters: :id, :sentences
    (0.1ms)  BEGIN
    (0.1ms)  COMMIT
    [active_model_serializers] Rendered GameSerializer with ActiveModelSerializers::Adapter::Json (0.38ms)
    Completed 200 OK in 5ms (Views: 0.7ms | ActiveRecord: 0.9ms)

这很令人抓狂，因为该参数在控制器中是明确允许的。

def game_params
  params.require(:game).permit(:hope, :wisdom, :user_id, :mnemonic, :sentences)
end

我无法使用 AJAX 更新句子列，尽管我已根据 this blog post 的建议向游戏模型添加了一个方法。

class Game < ApplicationRecord
 belongs_to :user

 def add_sentence(words)
  sentences_will_change!
  update_attributes sentences: sentences.push(words)
 end
end

我绝对可以在 Rails 控制台中更新。

    [3] pry(main)> game = Game.where(:id => 16).first
    Game Load (0.3ms)  SELECT  "games".* FROM "games" WHERE 
    "games"."id" = $1 ORDER BY "games"."id" ASC LIMIT $2  [["id", 16], 
    ["LIMIT", 1]]
    => #<Game:0x007ff420f750f0
    id: 16,
    hope: nil,
    wisdom: nil,
    created_at: Mon, 19 Mar 2018 00:33:57 UTC +00:00,
    updated_at: Mon, 19 Mar 2018 00:33:57 UTC +00:00,
    user_id: 1,
    mnemonic: "ah",
    sentences: ["hello", "world"]>


    [8] pry(main)> game.update(sentences: ['hello', 'world', 'again'])
    (0.2ms)  BEGIN
    User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
    SQL (0.4ms)  UPDATE "games" SET "updated_at" = $1, "sentences" = $2 WHERE "games"."id" = $3  [["updated_at", "2018-03-19 00:37:36.428710"], ["sentences", "{hello,world,again}"], ["id", 16]]
    (5.6ms)  COMMIT
    => true

    [10] pry(main)> game
    => #<Game:0x007ff420f750f0
    id: 16,
    hope: nil,
    wisdom: nil,
    created_at: Mon, 19 Mar 2018 00:33:57 UTC +00:00,
    updated_at: Mon, 19 Mar 2018 00:37:36 UTC +00:00,
    user_id: 1,
    mnemonic: "ah",
    sentences: ["hello", "world", "again"]>
    [11] pry(main)>

请帮忙？我为这个问题的愚蠢道歉，我只是不知道出了什么问题。

【问题讨论】：

标签： ruby-on-rails ajax

【解决方案1】：

一个问题似乎是您在允许的参数中实际上没有:id，但您在提供的示例中传递了id 键。

对于句子，尝试将您允许的参数中的sentences 键映射到一个空数组：

def game_params
  params.require(:game).permit(:hope, :wisdom, :user_id, :mnemonic, sentences: [])
end

此堆栈溢出评论中的更多信息：https://stackoverflow.com/a/16555975/2909095

【讨论】：