error of Unknown key(s): #<Picture:0xa4d673c>

[Wiinie]

i have this error .. when i try to take a value from other table. plus, in the terminal, it shows "select "users".* from users.
picture - album one-to-many relationship

def self.pic
Picture.all(joins => :album, :select => "album.image" )
end

//controller
  def show
       @user= User.all
       @me = User.pic
       
  end