初始化朋友模型在軌道上

Question

我建立了一個應用程序，用戶在那裏登錄扔有Facebook帳戶，我抓住他們的朋友和他們的教育歷史。它是這樣的：

在用戶登錄並轉到SessionsController＃創建：

class SessionsController < ApplicationController 
    def create 
    user = User.from_omniauth(env['omniauth.auth']) 
    end 
end 

的SessionsController方法調用創建在用戶模型的方法.from_omniauth：

def self.from_omniauth(auth) 
    where(auth.slice(:provider, :uid)).first_or_initialize.tap do |user| 
     user.provider = auth["provider"] 
     user.uid = auth["uid"] 
     ...more code... 
     user.save! 
     user.add_friends 
    end 
end 

.from_omniauth方法調用User模型中的方法add_friends：

def add_friends 
    friends_data = facebook.get_connections("me", "friends", :fields => "name, id, education") 
    friends_data.each do |hash| 
     friend.name = hash["name"] 
     friend.uid = hash["id"] 

     if hash["education"] 
     hash["education"].each do |e| 
      if e["type"] == "High School" 
      friend.highschool_name = e["school"]["name"] if (!hash["education"].blank? && !e["school"].blank?) 

      elsif e["type"] == "Graduate School" 
      friend.graduateschool_name = e["school"]["name"] if (!hash["education"].blank? && !e["school"].blank?) 
      end 
     end 
     end 
     friend.save! 
     friend 
    end 
    end 

我得到這個錯誤：

NameError in SessionsController#create 
undefined local variable or method `friend' for #<User:0x007fad11d50eb0> 

我知道這意味着我必須初始化的變量的朋友，但我不知道如何做到這一點的想法。任何想法，這將是非常有益的！ =）

Answer 1

使用friend = Friend.new在循環：

friends_data.each do |hash| 
    friend = Friend.new # <----------- 
    friend.name = hash["name"] 
    friend.uid = hash["id"] 

Answer 2

首先，你需要朋友型號：

rails g model Friend user_id:integer uid:string name:string highschool_name:string graduateschool_name:string 
rake db:migrate 

在友元類把belongs_to的：

class Friend < ActiveRecord::Base 
    belongs_to :user 
end 

在用戶級放的has_many ：

class User < ActiveRecord::Base 
    has_many :friends 
end 

現在你add_friend方法應該是這樣的：

def add_friends 
    friends_data = facebook.get_connections("me", "friends", :fields => "name, id, education") 
    friends_data.map do |hash| 
     friend=Friend.new 
     friend.name = hash["name"] 
     friend.uid = hash["id"] 
     friend.user_id = self.id 

     if hash["education"] 
     hash["education"].each do |e| 
      next if e["school"].blank? 
      if e["type"] == "High School" 
      friend.highschool_name = e["school"]["name"] 
      elsif e["type"] == "Graduate School" 
      friend.graduateschool_name = e["school"]["name"] 
      end 
     end 
     end 
     friend.save! 
     friend 
    end 
    end