Ruby on Rails

Hello,

I'm having an error I don't understand for several days. I have a class
Game, which have 2 attributes :
class Game < ActiveRecord::Base
has_many :players
has_many :cards, as: :cardable


Then I create a new instance and access the players it fails with void
value expression.

@game = Game.new(game_params);
puts "cards"
puts @game.cards
puts @game.cards.size()
puts "players"
puts @game.players

It displays:
cards
0
players

And it fails with: "void value expression" on the last line.

A few days ago this code worked just fine, I don't know what changed and
how to understand how to fix it.

Thank you.

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