Has Many Through, Stack Level Too Deep? - ruby

Question

I'm playing with my first has_many through relationship. I have three models. Here they are.
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :pools
has_many :games,
through: :pools
end
~
class Pool < ActiveRecord::Base
has_many :users
has_many :games,
through: :users
end
~
class Game < ActiveRecord::Base
belongs_to :user
belongs_to :pool
end
Should this set up allow me to do the following in IRB?
u=User.first
u.games
When I do that, I get the following error.
SystemStackError: stack level too deep
from /Users/ShiftedRec/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/irb/workspace.rb:86
Maybe IRB bug!
I should be able to do u.games, and u.pools?
it would also be nice to do a pool.users and pool.games.
How would I have to change my model set up so I can get access to those methods..?
I've been reading around but the has_many through is kind of confusing.
Here is my schema as well
ActiveRecord::Schema.define(version: 20140408165647) do
create_table "games", force: true do |t|
t.integer "pool_id"
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "games", ["pool_id", "user_id"], name: "index_games_on_pool_id_and_user_id", unique: true
create_table "pools", force: true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "user_id" #vestige of old approach
end
create_table "users", force: true do |t|
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0, null: false
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
I appreciate the help!

Answer 1

You were getting the error because your associations are defined incorrectly. Rails goofed up and went in recursion.
Update your models Pool and User as below:
class Pool < ActiveRecord::Base
has_many :games
has_many :users,
through: :games
end
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :games
has_many :pools,
through: :games
end
You are trying to create M-M Relationship between User and Pool through Game.
Also, remove user_id from pools table as you already have association through join table games.
Also, since you are on rails console(not IRB) after making above changes, reload the rails environment in console using reload! command.
Read more about has-many-through-associations in Rails guides.