ActiveModel Serializers：如何序列化资源集合？

Question

我有一个bookmarks资源，默认情况下已将其映射为json我的api名称空间下的routes.rb，如 namespace :api, defaults: {format: 'json'} do resources :bookmarks get ':username', to: 'users#index' get ':username/bookmarks/:id', to: 'users#show' end 所示：

Api::UsersController

我有一个BookmarkSerializer控制器和一个支持http://localhost:3000/api/emma_carter/bookmarks/87，可以在http://localhost:3000/api/emma_carter

等单个书签资源上正常使用

但是当我尝试点击应该为用户拥有的所有书签服务的Api::UsersController时，我会遇到各种不同的错误。这是我的module Api class UsersController < ApplicationController respond_to :json def index user = User.find_by(username: params[:username]) bookmarks = user.bookmarks render json: bookmarks end def show user = User.find_by(username: params[:username]) bookmark = user.bookmarks.find_by(params[:id]) render json: bookmark end end end

show

ArgumentError in Api::UsersController#index方法有效，但索引方法为我wrong number of arguments (1 for 0)

class BookmarkSerializer < ActiveModel::Serializer
    attributes :id, :url, :title, :domain, :notes, :image, :created, :username
    belongs_to :user

    def created
        object.created_at
    end

    def username
        user.username
    end
end

更新：完整堆栈跟踪：https://gist.github.com/amite/b79fc42bfd73de5a07bd

截图

这是序列化器：

index

关于堆栈溢出的其他解决方案，我还尝试了其他版本的 def index user = User.find_by(username: params[:username]) bookmarks = user.bookmarks bookmarks.map { |bookmark| ::BookmarkSerializer.new(bookmark)}.to_json #updated line end 方法：

Missing template api/users/index, application/index with {:locale=>[:en], :formats=>[:json], :variants=>[], :handlers=>[:erb, :builder, :raw, :ruby, :coffee, :jbuilder]}.

这给了我错误：

index

接下来我的def index user = User.find_by(username: params[:username]) bookmarks = user.bookmarks ActiveModel::ArraySerializer.new(bookmarks, each_serializer: ::BookmarkSerializer).to_json end 方法的最后一个版本如下所示：

uninitialized constant ActiveModel::ArraySerializer

这给了我错误rails 4.1.5

我做错了什么？我正在使用active_model_serializers和gem 'active_model_serializers', github: 'rails-api/active_model_serializers' 的github版本 宝石。

bookmarks

更新：由于我正在尝试输出BookmarksSerializer的集合，我还尝试使用单独的序列化程序 ArgumentError in Api::UsersController#index wrong number of arguments (1 for 0)但我收到同样的错误：index

UPDATE2：这是json方法的一个版本，它在某种意义上有效，它以 def index user = User.find_by(username: params[:username]) bookmarks = user.bookmarks respond_with bookmarks.to_json end 格式呈现资源集合：

BookmarksSerializer

但是这仍然没有使用class BookmarksSerializer < ActiveModel::Serializer attributes :id, :title end

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.5'
# Use mysql as the database for Active Record
gem 'mysql2'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.3'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer',  platforms: :ruby

gem 'bourbon'
gem 'neat'
gem 'bitters'
gem 'refills'

gem 'wisper'
gem 'rails-ioc'
gem 'reform'
gem 'cells'
gem "pundit"

gem 'active_model_serializers', github: 'rails-api/active_model_serializers'

gem "font-awesome-rails"

gem 'simple_form'

# Use jquery as the JavaScript library
gem 'jquery-rails'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0',          group: :doc

group :development, :test do
  # Call 'debugger' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
  gem 'ffaker'
  gem 'pry-rails'

  gem 'capybara'
  gem 'factory_girl_rails'
  gem 'database_cleaner'
  gem 'capybara-webkit'
  gem 'rspec-cells'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'

  gem 'spring-commands-rspec'
  gem 'rspec-rails'
  gem 'guard-rspec'
  gem 'rb-fsevent' if `uname` =~ /Darwin/
end

# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'

# Use unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Use debugger
# gem 'debugger', group: [:development, :test]

它只输出默认哈希

Full Gemfile

来源'https://rubygems.org'

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Answer 1

结果我需要包含宝石的v0.9

gem 'active_model_serializers', github: 'rails-api/active_model_serializers', branch: '0-9-stable'

Answer 2

你可以尝试改变：

def index
  user = User.find_by(username: params[:username])
  bookmarks = user.bookmarks
  bookmarks.map { |bookmark| ::BookmarkSerializer.new(bookmark)}.to_json #updated line
end

为：

def index
  user = User.find_by(username: params[:username])
  bookmarks = user.bookmarks
  render json: bookmarks.map { |bookmark| ::BookmarkSerializer.new(bookmark)}
end