ruby-on-rails - 获取数组哈希值

Question

所以我试图从这一系列哈希中获取所有高中和研究生院：

"education": [
    {
      "school": {
        "id": "110703012290674", 
        "name": "Kunskapsgymnasiet Malmö"
      }, 
      "year": {
        "id": "136328419721520", 
        "name": "2009"
      }, 
      "type": "High School"
    }, 
    {
      "school": {
        "id": "112812485399398", 
        "name": "Malmö University"
      }, 
      "year": {
        "id": "118118634930920", 
        "name": "2012"
      }, 
      "concentration": [
        {
          "id": "104076956295773", 
          "name": "Computer Science"
        }
      ], 
      "type": "Graduate School", 
      "classes": [
        {
          "id": "165093923542525", 
          "name": "Programmering", 
          "description": "Kursen fokuserar på metoder och tekniker vid utveckling av webbapplikationer med hjälp av HTML5."
        }
      ]
    }
  ],

像这样：

def add_friends
    facebook.get_connections("me", "friends",   :fields => "name, id, education").each do |hash|
      self.friends.where(:name => hash['name'], :uid => hash['id'], 
                                                :highschool_name => hash['education']['school']['name'] if hash['type'] == "High School",
                                                :graduateschool_name => hash['education']['school']['name'] if hash['type'] == "Graduate School").first_or_create
    end
  end

我尝试了这样的事情：

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

但是我得到了这个错误：undefined local variable or method朋友'我认为缺少与缺少的朋友模型的联系..

Answer 1

你可能想看看Array#select在那里你可以指定条件来获取所有符合某些条件的值：

schools.select{|school| school["type"] == "High School" || school["type"] == "Graduate School"}