紅寶石方法“每個”都行不通嗎？

Question

我試圖隨機獲取用戶朋友的列表，但是當我嘗試使用每個id時，“每種”方法似乎不起作用。 請幫忙。

我的代碼：

def get_friendsids_from (user, num_to_gather)
  userid_file = File.new("friends_ids.txt","a")
  friends_list = client.friends(user).take(num_to_gather).sample
  friends_list.each {|idnumber|
    puts idnumber.followers_count
    #puts client.user(idnumber).id
    puts idnumber.screen_name
    userid_file.puts "#{idnumber.id}"  
  }
end


get_friendsids_from("user", 5)

我得到的錯誤是：

twitter.rb:94:in `get_friendsids_from': undefined method `each' for #<Twitter::User id=2343746551> (NoMethodError)
    from twitter.rb:103:in `<main>'

感謝您的時間和考慮 ：）

Answer 1

因為friends_list是記錄，而不是數組，所以它沒有each方法。

sample: Choose a random element from the array

a = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
a.sample         #=> 7 # You just get one element ,not an array.
a.sample(4)      #=> [6, 4, 2, 5]

Answer 2

嘗試這個：

def get_friendsids_from (user, num_to_gather)
  userid_file = File.new("friends_ids.txt","a")
  friends_list = client.friends(user).take(num_to_gather)
  friends_list.each {|idnumber|
    puts idnumber.followers_count
    #puts client.user(idnumber).id
    puts idnumber.screen_name
    userid_file.puts "#{idnumber.id}"  
  }
end


get_friendsids_from("user", 5)

Answer 3

我們做得到 -

 def get_friendsids_from (user, num_to_gather)
   userid_file = File.new("friends_ids.txt","a")
   friends_list = client.friends(user).take(num_to_gather).sample(10)
   friends_list.each {|idnumber|
     puts idnumber.followers_count
     #puts client.user(idnumber).id
     puts idnumber.screen_name
     userid_file.puts "#{idnumber.id}"  
   }
 end


 get_friendsids_from("user", 5)

Answer 4

只需更改此行

friends_list = client.friends(user).take(num_to_gather).sample

對此

friends_list = client.friends(user).sample(num_to_gather)