红宝石方法“每个”都行不通吗？

Question

我试图随机获取用户朋友的列表，但是当我尝试使用每个id时，“每种”方法似乎不起作用。 请帮忙。

我的代码：

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)

我得到的错误是：

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

感谢您的时间和考虑 ：）

Answer 1

因为friends_list是记录，而不是数组，所以它没有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

尝试这个：

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

我们做得到 -

 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

对此

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