gist: 104625


  
    
      Ruby #
    
    
      
      
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              # Let's say we have this:
 
class User < ActiveRecord::Base
  has_many :posts
end
 
class Post < ActiveRecord::Base
  belongs_to :user
end
 
# How do I do these:
 
# 1) Find only users who have at least one post
 
# 2) List users in order of most posts to least posts
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