Json parseerror & 意外令牌

Question

仍在尝试修复我的 ajax 以使用控制器。 现在我收到此错误消息：

response SyntaxError: Unexpected token j ,  xhr[object Object] ,  STATUS parsererror

config.routes

resources :books do 
    member do 
      get '/last_chapter/', to: 'chapters#last_chapter', as: 'last_chapter', defaults: { format: 'json' }
    end
    resources :chapters
  end 

章节控制器

def last_chapter
        @last_chapter = Chapter.order(created_at: :desc).limit(1)
        respond_to do |format|
            format.json
        end
    end

last_chapter.json

json.extract! @last_chapter, :id, :title, :characters, :created_at, :updated_at

脚本.js

$.ajax({
      type: "GET",
      url: '/books/103/last_chapter.json',
      contentType: "application/json",
      success: function(data) {
        console.log('JAAAA ENDELIG FUNKER DET');
        $("body").html(data);
      },
      error: function(xhr, status, response) {
        console.log('response ' + response +  ' ,  xhr' + xhr +  ' ,  ' + 'STATUS ' + status)}
    });

感觉我已经尝试了一切。如果您需要更多信息，请告诉我！ :)

Answer 1

我认为您的问题在于路线。这是我会做的：

resources :books do
  get :last_chapter, on: :member
end

books_controller.rb

def last_chapter
  @last_chapter = Book.find(params[:id]).chapters.last
  respond_to do |format|
    format.json do
      render json: { does_it_work: :yes }
    end
  end
end

我假设以下模型：

class Book < ActiveRecord::Base
    has_many :chapters
end