Facebook graph api RubyonRails6应用程序，如何从facebook获得使用相同应用程序的朋友？

为了在应用程序中进行授权，我通过gem'omniauth facebook'使用facebook登录。但目前还无法确定如何获取同时使用我的应用程序（已登录）的朋友列表，并将结果显示在单独的页面上。并在应用程序中共享他的资源（在示例书签中）

我的档案

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.6.3'

gem 'rails', '~> 6.0.0'
gem 'pg', '>= 0.18', '< 2.0'
gem 'puma', '~> 3.11'
gem 'sass-rails', '~> 5'
gem 'webpacker', '~> 4.0'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.7'
gem 'bootsnap', '>= 1.4.2', require: false

gem 'omniauth-facebook'

group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'dotenv-rails'
end

group :development do
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of web drivers to run system tests with browsers
  gem 'webdrivers'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

源代码'https://rubygems.org'
git|u源（：github）{| repo |“https://github.com/#{repo}.git}
ruby“2.6.3”
gem'rails'，“~>6.0.0”
宝石'pg'，'>=0.18'，'<2.0'
宝石“彪马”，“大于3.11”
gem'sass rails'，“~>5”
gem'webpacker'，“~>4.0”
gem“涡轮链接”，“大于5”
gem'jbuilder'，“~>2.7”
gem'bootsnap'，'>=1.4.2'，require:false
gem'omniauth facebook'
小组：开发，：测试
gem'byebug'，平台：[：mri，：mingw，：x64_mingw]
gem'dotenv rails'
结束
小组：发展怎么办
gem“web控制台”，“>=3.3.0”
gem'listen'，'>=3.0.5'，'<3.2'
宝石“春天”
gem‘SpringWatcherListen’，“~>2.0.0”
结束
组：测试do
#增加了对Capybara系统测试和selenium驱动程序的支持
gem‘水豚’，“>=2.15”
gem“selenium webdriver”
#轻松安装和使用web驱动程序以使用浏览器运行系统测试
gem“webdrivers”
结束
#Windows不包括zoneinfo文件，因此捆绑tzinfo数据
gem'tzinfo data'，平台：[:mingw，:mswin，:x64_mingw，:jruby]

用户模型

class User < ApplicationRecord
  has_many :bookmarks, dependent: :destroy

  def self.create_with_omniauth(auth)
    create! do |user|
      user.provider = auth['provider']
      user.uid = auth['uid']
      if auth['info']
        user.name = auth['info']['name'] || ""
        user.email = auth['info']['email'] || ""
      end
    end
  end
end

class用户

会话控制器

class SessionsController < ApplicationController
  def create
    auth = request.env["omniauth.auth"]
    user = User.where(:provider => auth['provider'],
    :uid => auth['uid']).first || User.create_with_omniauth(auth)
    session[:user_id] = user.id
    redirect_to root_url, :notice => "Signed in!"
  end

  def new
    redirect_to '/auth/facebook'
  end

  def destroy
    reset_session
    redirect_to root_url, notice => 'Signed out'
  end
end

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  helper_method :current_user

  def authenticate
    redirect_to :login unless user_signed_in?
  end

  def current_user
    @current_user ||= User.find(session[:user_id]) if session[:user_id]
  end

  def user_signed_in?
    !!current_user
  end

end

class sessioncontrollerauth['provider']，
：uid=>auth['uid']）。第一个| |用户。使用_omniauth（auth）创建
会话[：user\u id]=user.id
将\u重定向到root\u url，：notice=>“已登录！”
结束
def新
重定向到“/auth/facebook”
结束
def销毁
重置会话
将\重定向到根\ url，注意=>“已注销”
结束
结束

书签控制器

class BookmarksController < ApplicationController
  before_action :authenticate
  before_action :set_bookmark, only: [:show, :edit, :update, :destroy, :bookmark_owner]
  before_action :bookmark_owner, only: [:show, :edit, :update, :destroy]

  def index
    @bookmarks = current_user.bookmarks
  end

  def show
  end

  def new
    @bookmark = current_user.bookmarks.build
  end

  def edit
  end

  def create
    @bookmark = current_user.bookmarks.build(bookmark_params)

    respond_to do |format|
      if @bookmark.save
        format.html { redirect_to @bookmark, notice: 'Bookmark was successfully created.' }
        format.json { render :show, status: :created, location: @bookmark }
      else
        format.html { render :new }
        format.json { render json: @bookmark.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @bookmark.update(bookmark_params)
        format.html { redirect_to @bookmark, notice: 'Bookmark was successfully updated.' }
        format.json { render :show, status: :ok, location: @bookmark }
      else
        format.html { render :edit }
        format.json { render json: @bookmark.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @bookmark.destroy
    respond_to do |format|
      format.html { redirect_to bookmarks_url, notice: 'Bookmark was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  def bookmark_owner
    unless @bookmark.user_id == current_user.id
     flash[:notice] = 'Access denied as you are not owner'
     redirect_to bookmarks_path
    end
  end

  private
    def set_bookmark
      @bookmark = Bookmark.find(params[:id])
    end

    def bookmark_params
      params.fetch(:bookmark, {}).permit(:name, :url)
    end
end

class BookmarksController

应用控制器

class SessionsController < ApplicationController
  def create
    auth = request.env["omniauth.auth"]
    user = User.where(:provider => auth['provider'],
    :uid => auth['uid']).first || User.create_with_omniauth(auth)
    session[:user_id] = user.id
    redirect_to root_url, :notice => "Signed in!"
  end

  def new
    redirect_to '/auth/facebook'
  end

  def destroy
    reset_session
    redirect_to root_url, notice => 'Signed out'
  end
end

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  helper_method :current_user

  def authenticate
    redirect_to :login unless user_signed_in?
  end

  def current_user
    @current_user ||= User.find(session[:user_id]) if session[:user_id]
  end

  def user_signed_in?
    !!current_user
  end

end

class ApplicationController

我将非常感谢您的帮助：什么可以用于这些目的。

试试看——您可以在这里查阅