Ruby-on-rails 如何允许具有强参数的数组
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how to permit an array with strong parameters
提问by Leahcim
I have a functioning Rails 3 app that uses has_many :through associations which is not, as I remake it as a Rails 4 app, letting me save ids from the associated model in the Rails 4 version.
我有一个功能正常的 Rails 3 应用程序，它使用 has_many :through 关联，这不是，因为我将它改造成 Rails 4 应用程序，让我从 Rails 4 版本中的关联模型中保存 ID。
These are the three relevant models are the same for the two versions.
这些是三个相关模型对于两个版本是相同的。
Categorization.rb
分类.rb
class Categorization < ActiveRecord::Base
belongs_to :question
belongs_to :category
end
Question.rb
问题.rb
has_many :categorizations
has_many :categories, through: :categorizations
Category.rb
类别.rb
has_many :categorizations
has_many :questions, through: :categorizations
In both apps, the category ids are getting passed into the create action like this
在这两个应用程序中，类别 ID 被传递到这样的创建操作中
"question"=>{"question_content"=>"How do you spell car?", "question_details"=>"blah ", "category_ids"=>["", "2"],
In the Rails 3 app, when I create a new question, it inserts into questions table and then into the categorizations table
在 Rails 3 应用程序中，当我创建一个新问题时，它会插入到问题表中，然后插入到分类表中
SQL (82.1ms) INSERT INTO "questions" ("accepted_answer_id", "city", "created_at", "details", "province", "province_id", "question", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?) [["accepted_answer_id", nil], ["city", "dd"], ["created_at", Tue, 14 May 2013 17:10:25 UTC +00:00], ["details", "greyound?"], ["province", nil], ["province_id", 2], ["question", "Whos' the biggest dog in the world"], ["updated_at", Tue, 14 May 2013 17:10:25 UTC +00:00], ["user_id", 53]]
SQL (0.4ms) INSERT INTO "categorizations" ("category_id", "created_at", "question_id", "updated_at") VALUES (?, ?, ?, ?) [["category_id", 2], ["created_at", Tue, 14 May 2013 17:10:25 UTC +00:00], ["question_id", 66], ["updated_at", Tue, 14 May 2013 17:10:25 UTC +00:00]]
In the rails 4 app, after it processes the parameters in QuestionController#create, I'm getting this error in the server logs
在 rails 4 应用程序中，在处理 QuestionController#create 中的参数后，我在服务器日志中收到此错误
Unpermitted parameters: category_ids
and the question is only getting inserted into the questions table
并且问题只是被插入到问题表中
(0.2ms) BEGIN
SQL (67.6ms) INSERT INTO "questions" ("city", "created_at", "province_id", "question_content", "question_details", "updated_at", "user_id") VALUES (, , , , , , ) RETURNING "id" [["city", "dd"], ["created_at", Tue, 14 May 2013 17:17:53 UTC +00:00], ["province_id", 3], ["question_content", "How's your car?"], ["question_details", "is it runnign"], ["updated_at", Tue, 14 May 2013 17:17:53 UTC +00:00], ["user_id", 12]]
(31.9ms) COMMIT
Although I am not storing the category_ids on the Questions model, I set category_ids as a permitted parameter in the questions_controller
虽然我没有将 category_ids 存储在 Questions 模型中，但我将 category_ids 设置为 questions_controller 中允许的参数
def question_params
params.require(:question).permit(:question_details, :question_content, :user_id, :accepted_answer_id, :province_id, :city, :category_ids)
end
Can anyone explain how I'm supposed to save the category_ids? Note, there is no create action in the categories_controller.rb of either app.
谁能解释我应该如何保存category_ids？请注意，任一应用程序的 category_controller.rb 中都没有创建操作。
These are the three tables that are the same in both apps
这是两个应用程序中相同的三个表
create_table "questions", force: true do |t|
t.text "question_details"
t.string "question_content"
t.integer "user_id"
t.integer "accepted_answer_id"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "province_id"
t.string "city"
end
create_table "categories", force: true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "categorizations", force: true do |t|
t.integer "category_id"
t.integer "question_id"
t.datetime "created_at"
t.datetime "updated_at"
end
Update
更新
This is the create action from the Rails 3 app
这是来自 Rails 3 应用程序的创建操作
def create
@question = Question.new(params[:question])
respond_to do |format|
if @question.save
format.html { redirect_to @question, notice: 'Question was successfully created.' }
format.json { render json: @question, status: :created, location: @question }
else
format.html { render action: "new" }
format.json { render json: @question.errors, status: :unprocessable_entity }
end
end
end
This is the create action from the Rails 4 app
这是来自 Rails 4 应用程序的创建操作
def create
@question = Question.new(question_params)
respond_to do |format|
if @question.save
format.html { redirect_to @question, notice: 'Question was successfully created.' }
format.json { render json: @question, status: :created, location: @question }
else
format.html { render action: "new" }
format.json { render json: @question.errors, status: :unprocessable_entity }
end
end
end
This is the question_params method
这是 question_params 方法
private
def question_params
params.require(:question).permit(:question_details, :question_content, :user_id, :accepted_answer_id, :province_id, :city, :category_ids)
end
回答by Leahcim
This https://github.com/rails/strong_parametersseems like the relevant section of the docs:
这个https://github.com/rails/strong_parameters似乎是文档的相关部分：
The permitted scalar types are String, Symbol, NilClass, Numeric, TrueClass, FalseClass, Date, Time, DateTime, StringIO, IO, ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile.
To declare that the value in params must be an array of permitted scalar values map the key to an empty array:
params.permit(:id => [])
允许的标量类型为 String、Symbol、NilClass、Numeric、TrueClass、FalseClass、Date、Time、DateTime、StringIO、IO、ActionDispatch::Http::UploadedFile 和 Rack::Test::UploadedFile。
要声明 params 中的值必须是允许的标量值数组，请将键映射到空数组：
params.permit(:id => [])
In my app, the category_ids are passed to the create action in an array
在我的应用程序中，category_ids 以数组的形式传递给 create 操作
"category_ids"=>["", "2"],
Therefore, when declaring strong parameters, I explicitly set category_ids to be an array
因此，在声明强参数时，我明确将 category_ids 设置为数组
params.require(:question).permit(:question_details, :question_content, :user_id, :accepted_answer_id, :province_id, :city, :category_ids => [])
Works perfectly now!
现在完美运行！
(IMPORTANT:As @Lenart notes in the comments, the array declarations must be at the endof the attributes list, otherwise you'll get a syntax error.)
（重要提示：正如@Lenart 在注释中所指出的，数组声明必须位于属性列表的末尾，否则会出现语法错误。）
回答by Brian
If you want to permit an array of hashes(or an array of objectsfrom the perspective of JSON)
如果你想允许一个哈希数组（或an array of objects从 JSON 的角度）
params.permit(:foo, array: [:key1, :key2])
2 points to notice here:
这里要注意2点：
arrayshould be the last argument of thepermitmethod.- you should specify keys of the hash in the array, otherwise you will get an error
Unpermitted parameter: array, which is very difficult to debug in this case.
array应该是方法的最后一个参数permit。- 你应该在数组中指定散列的键，否则你会得到一个错误
Unpermitted parameter: array，在这种情况下很难调试。
回答by Matias Seguel
It should be like
它应该像
params.permit(:id => [])
Also since rails version 4+ you can use:
此外，从 Rails 版本 4+ 开始，您可以使用：
params.permit(id: [])
回答by Fellow Stranger
If you have a hash structure like this:
如果您有这样的哈希结构：
Parameters: {"link"=>{"title"=>"Something", "time_span"=>[{"start"=>"2017-05-06T16:00:00.000Z", "end"=>"2017-05-06T17:00:00.000Z"}]}}
Then this is how I got it to work:
然后这就是我让它工作的方式：
params.require(:link).permit(:title, time_span: [[:start, :end]])
回答by Daniel Duque
I can't comment yet but following on Fellow Stranger solution you can also keep nesting in case you have keys which values are an array. Like this:
我还不能发表评论，但是按照 Fellow Stranger 解决方案，你也可以继续嵌套，以防你有一个值为数组的键。像这样：
filters: [{ name: 'test name', values: ['test value 1', 'test value 2'] }]
This works:
这有效：
params.require(:model).permit(filters: [[:name, values: []]])
