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Rails 5.1 API - how to enable parameters for nested attributes of a JSON object

There are at least 10 questions on this topic, but not one of them answers this specific problem. Many questions relate to Rails forms like this , which I don't have, or to more complex json structures like this or this .

EDIT regarding the accepted answer and why it is not an exact duplicate

The related question in the answer from @CarlosRoque initially looks like the same problem, but it only solves the Rails problem of that particular problem.

If you read all the comments, you will see that several attempts to change the method template_paramswere made for RENAME or REPLACE the nested attribute "template_items" with "template_items_attributes". This is necessary because Rails accepts_nested_attributes_forrequires adding "_attributes" to the name, otherwise it will not be able to see it.

If you study the monkey patch code in this answer to fix the wrap_parameters parameters so that it works for nested attributes, you still have a problem that it will not actually find "template_items" (nested object) because it does not have the suffix "_tributes "

Therefore, in order to completely solve this problem, the client also had to be modified to send a nested object as "template_items_attributes". For JS clients, this can be done by implementing the toJSON () method for the object in order to change it during serialization (example here ). But keep in mind that when deserializing JSON, you need to manually create an instance of this object for the JSON () function to work (explained why here ).

I have a simple has_many / belongs_to:

Models:

class Template < ApplicationRecord
  belongs_to :account
  has_many :template_items
  accepts_nested_attributes_for :template_items, allow_destroy: true
end


class TemplateItem < ApplicationRecord  
  belongs_to :template
  validates_presence_of :template

  enum item_type: {item: 0, heading: 1} 
end

json sent from the client is as follows:

{
  "id": "55e27eb7-1151-439d-87b7-2eba07f3e1f7",
  "account_id": "a61151b8-deed-4efa-8cad-da1b143196c9",
  "name": "Test",
  "info": "INFO1234",
  "title": "TITLE1",
  "template_items": [
    {
      "is_completed": false,
      "item_type": "item"
    },
    {
      "is_completed": false,
      "item_type": "heading"
    }
  ]
}

Sometimes in each template_item there will be an attribute :idand :content(for example, after they have been created and the user will start editing them).

The method is template_params templates_controlleras follows:

   params.require(:template).permit(
      :id, :account_id, :name, :title, :info, 
      template_items: [:id, :is_completed, :content, :item_type]
  )

Rails, :

   params.require(:template).permit(
      :id, :account_id, :name, :title, :info, 
      template_items_attributes: [:id, :is_completed, :content, :item_type]
  )

.

:

def template_params
  params.require(:template).permit(:id, :account_id, :name, :title, :info, template_items: [:id, :is_completed, :content, :item_type])
  params[:template_items_attributes] = params.delete(:template_items) if params[:template_items]
  Rails.logger.info params
end

, :

{  
      "template"   =><ActionController::Parameters   {  
      "id"      =>"55e27eb7-1151-439d-87b7-2eba07f3e1f7",
      "account_id"      =>"a61151b8-deed-4efa-8cad-da1b143196c9",
      "name"      =>"Test",
      "info"      =>"INFO1234",
      "title"      =>"TITLE1",
   }   permitted:false   >,
   "template_items_attributes"   =>   [  
      <ActionController::Parameters      {  
         "is_completed"         =>false,
         "item_type"         =>"item"
      }      permitted:false      >,
      <ActionController::Parameters      {  
         "is_completed"         =>false,
         "item_type"         =>"item"
      }      permitted:false      >
   ]
}

:

template_params.merge! ({template_items_attributes:
params[:template_items]}) if params[:template_items].present?

.

, , template_params .permit! (.. , )?

:

def update
    Rails.logger.info "*******HERE*******"
    Rails.logger.info template_params
    @template.template_items = template_params[:template_items_attributes]

    if @template.update(template_params)
      render json: @template
    else
      render json: ErrorSerializer.serialize(@template.errors), status: :unprocessable_entity
    end
  end

UDPATE

"template_items_attributes" "template_items" Rails, template_params :

    def template_params
      params.require(:template).permit(:id, :account_id, :name, :title, :info, template_items_attributes: [:id, :is_completed, :content, :item_type])
    end

- !

, :

def update
    Rails.logger.info params
    Rails.logger.info "*******HERE*******"    
    Rails.logger.info template_params

    if @template.update(template_params)
      render json: @template
    else
      render json: ErrorSerializer.serialize(@template.errors), status: :unprocessable_entity
    end
  end

- Rails STILL . , , , : false, template_params "template_items_attributes" : true.

I, [2017-10-20T21:52:39.886104 #28142]  INFO -- : Processing by Api::TemplatesController#update as JSON
I, [2017-10-20T21:52:39.886254 #28142]  INFO -- :   Parameters: {"id"=>"55e27eb7-1151-439d-87b7-2eba07f3e1f7", "account_id"=>"a61151b8-deed-4efa-8cad-da1b143196c9", "name"=>"Test", "info"=>"INFO12345", "title"=>"TITLE1", "created_at"=>"2017-10-14T19:30:41.450Z", "updated_at"=>"2017-10-20T17:48:24.909Z", "template_items_attributes"=>[{"is_completed"=>false, "item_type"=>"item"}], "template"=>{"id"=>"55e27eb7-1151-439d-87b7-2eba07f3e1f7", "account_id"=>"a61151b8-deed-4efa-8cad-da1b143196c9", "name"=>"Test", "info"=>"INFO12345", "title"=>"TITLE1", "created_at"=>"2017-10-14T19:30:41.450Z", "updated_at"=>"2017-10-20T17:48:24.909Z"}}
D, [2017-10-20T21:52:39.903011 #28142] DEBUG -- :   User Load (7.7ms)  SELECT  "users".* FROM "users" WHERE "users"."uid" = $1 LIMIT $2  [["uid", "rmcsharry+owner@gmail.com"], ["LIMIT", 1]]
D, [2017-10-20T21:52:40.072148 #28142] DEBUG -- :   Template Load (1.4ms)  SELECT  "templates".* FROM "templates" WHERE "templates"."id" = $1 ORDER BY name ASC LIMIT $2  [["id", "55e27eb7-1151-439d-87b7-2eba07f3e1f7"], ["LIMIT", 1]]
I, [2017-10-20T21:52:40.083727 #28142]  INFO -- : <ActionController::Parameters {"id"=>"55e27eb7-1151-439d-87b7-2eba07f3e1f7", "account_id"=>"a61151b8-deed-4efa-8cad-da1b143196c9", "name"=>"Test", "info"=>"INFO12345", "title"=>"TITLE1", "created_at"=>"2017-10-14T19:30:41.450Z", "updated_at"=>"2017-10-20T17:48:24.909Z", "template_items_attributes"=>[{"is_completed"=>false, "item_type"=>"item"}], "controller"=>"api/templates", "action"=>"update", "template"=>{"id"=>"55e27eb7-1151-439d-87b7-2eba07f3e1f7", "account_id"=>"a61151b8-deed-4efa-8cad-da1b143196c9", "name"=>"Test", "info"=>"INFO12345", "title"=>"TITLE1", "created_at"=>"2017-10-14T19:30:41.450Z", "updated_at"=>"2017-10-20T17:48:24.909Z"}} permitted: false>
I, [2017-10-20T21:52:40.083870 #28142]  INFO -- : *******HERE*******
D, [2017-10-20T21:52:40.084550 #28142] DEBUG -- : Unpermitted parameters: :created_at, :updated_at
I, [2017-10-20T21:52:40.084607 #28142]  INFO -- : <ActionController::Parameters {"id"=>"55e27eb7-1151-439d-87b7-2eba07f3e1f7", "account_id"=>"a61151b8-deed-4efa-8cad-da1b143196c9", "name"=>"Test", "title"=>"TITLE1", "info"=>"INFO12345"} permitted: true>
D, [2017-10-20T21:52:40.084923 #28142] DEBUG -- : Unpermitted parameters: :created_at, :updated_at
D, [2017-10-20T21:52:40.085375 #28142] DEBUG -- :    (0.2ms)  BEGIN
D, [2017-10-20T21:52:40.114015 #28142] DEBUG -- :   Account Load (1.2ms)  SELECT  "accounts".* FROM "accounts" WHERE "accounts"."id" = $1 LIMIT $2  [["id", "a61151b8-deed-4efa-8cad-da1b143196c9"], ["LIMIT", 1]]
D, [2017-10-20T21:52:40.131895 #28142] DEBUG -- :   Template Exists (0.8ms)  SELECT  1 AS one FROM "templates" WHERE "templates"."name" = $1 AND ("templates"."id" != $2) AND "templates"."account_id" = 'a61151b8-deed-4efa-8cad-da1b143196c9' LIMIT $3  [["name", "Test"], ["id", "55e27eb7-1151-439d-87b7-2eba07f3e1f7"], ["LIMIT", 1]]
D, [2017-10-20T21:52:40.133754 #28142] DEBUG -- :    (0.3ms)  COMMIT
D, [2017-10-20T21:52:40.137763 #28142] DEBUG -- :   CACHE Account Load (0.0ms)  SELECT  "accounts".* FROM "accounts" WHERE "accounts"."id" = $1 LIMIT $2  [["id", "a61151b8-deed-4efa-8cad-da1b143196c9"], ["LIMIT", 1]]
D, [2017-10-20T21:52:40.138714 #28142] DEBUG -- :    (0.2ms)  BEGIN
D, [2017-10-20T21:52:40.141293 #28142] DEBUG -- :   User Load (1.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2 FOR UPDATE  [["id", "88de3be9-6d18-4687-ab80-d50f78638ca9"], ["LIMIT", 1]]
D, [2017-10-20T21:52:40.235163 #28142] DEBUG -- :   Account Load (0.7ms)  SELECT  "accounts".* FROM "accounts" WHERE "accounts"."id" = $1 LIMIT $2  [["id", "a61151b8-deed-4efa-8cad-da1b143196c9"], ["LIMIT", 1]]
D, [2017-10-20T21:52:40.240997 #28142] DEBUG -- :   SQL (1.4ms)  UPDATE "users" SET "tokens" = $1, "updated_at" = $2 WHERE "users"."id" = $3  [["tokens", "{\"ryyymFZ7fpH50rMKArjZ2Q\":{\"token\":\"$2a$10$4jkgRe4LBPxJ8fQUOKCSausUi7DbIUD0bE.7ZRoOuTHrRuX6CaWOe\",\"expiry\":1509293414,\"last_token\":\"$2a$10$cpI.mz81JFjQT0J9acCCl.NdrEatI5l17GtrwrAfwyhyN3xRExcaC\",\"updated_at\":\"2017-10-15T17:10:16.996+02:00\"},\"Y2y0maUT5WYSfH6VZeORag\":{\"token\":\"$2a$10$8KERiIwlc3rX.Mdu.CW6wOMLDbVyB2PFCaBIlw7/LUxC3ITpYTISW\",\"expiry\":1509293475,\"last_token\":\"$2a$10$r6Xw6798T1P7UZlTbEaXoeBCl9oK2fMs72ppAtars8Ai/kaE6nE66\",\"updated_at\":\"2017-10-15T17:11:18.066+02:00\"},\"9Cy48CPVj3WhFkEBPUZQ1Q\":{\"token\":\"$2a$10$Qy4JOD8.jIcPhf93MqFCIelnVaA/ssE31w5DlL8MShDuMROsLSNuS\",\"expiry\":1509293942,\"last_token\":\"$2a$10$e6sxklrHRRD1C15Ix/MqQOfACuCMznmzUjF296cpO1ypWVvJ.JFJK\",\"updated_at\":\"2017-10-15T17:19:05.200+02:00\"},\"O5iufW0Gacqs9sIfJ9705w\":{\"token\":\"$2a$10$EkDf7.y3lY9D36lAwNHBGuct97M6/HGDvnrUsD72c8zCsfVd8y9c2\",\"expiry\":1509482450,\"last_token\":\"$2a$10$S0kHEvKxom2Qgdy0r.q0aeTSlSBFkqU4XZeY91n3RkkYkQykmmGVi\",\"updated_at\":\"2017-10-17T21:40:50.300+02:00\"},\"ETOadoEtoxcz6rR6Ced_dA\":{\"token\":\"$2a$10$8t01bWv/PsVojs3cazuSg..FWa9SZwq1/PUDfuN1S4yBxnMFv2zre\",\"expiry\":1509742360,\"last_token\":\"$2a$10$hveuajISXDOjHLm9EkVzvOd3pwKkqE1rQnIFBoojf0vgMLXV2EvVe\",\"updated_at\":\"2017-10-20T21:52:40.233+02:00\"}}"], ["updated_at", "2017-10-20 19:52:40.236607"], ["id", "88de3be9-6d18-4687-ab80-d50f78638ca9"]]
D, [2017-10-20T21:52:40.243960 #28142] DEBUG -- :    (1.3ms)  COMMIT
I, [2017-10-20T21:52:40.244504 #28142]  INFO -- : Completed 200 OK in 358ms (Views: 1.0ms | ActiveRecord: 37.7ms)
+4
2

, , params.require(: template).permit(... - , , params , , . , , - , .

def template_params
  params[:template][:template_items_attributes] = params[:template_items_attributes]
  params.require(:template).permit(:id, :account_id, :name, :title, :info, template_items_attributes: [:id, :is_completed, :content, :item_type])
end

UPDATE: wrap_parameters , .

UPDATE: Rails 4 JSON

github! https://github.com/rails/rails/pull/19254

+3

update, @template, . "", .

, update, @template update @template.

sudo ( , ):

class Template < ApplicationRecord
  belongs_to :account
  has_many :template_items
  accepts_nested_attributes_for :template_items, allow_destroy: true
end


class TemplateItem < ApplicationRecord  
  belongs_to :template, optional:true  # <------ CHANGE
  validates_presence_of :template

  enum item_type: {item: 0, heading: 1} 
end


params.require(:template).permit(
      :id, :account_id, :name, :title, :info, 
      template_items_attributes: [:id, :is_completed, :content, :item_type]
  )


def update

    template_params.template_items.each do |item_hash| # <------ CHANGE
        @template.template_items.build(item_hash)
    end

    if @template.update(template_params)
      render json: @template
    else
      render json: ErrorSerializer.serialize(@template.errors), status: :unprocessable_entity
    end
 end
+1

Source: https://habr.com/ru/post/1687899/

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