Rails ActiveRecord join three tables and retrieve nested objects - ruby-on-rails

Question

I have three model classes: Games, Teams, and Players:
class Game < ActiveRecord::Base
has_many :teams
end
class Team < ActiveRecord::Base
belongs_to :game
has_many :players
end
class Player < ActiveRecord::Base
belongs_to :team
end
class CreateGames < ActiveRecord::Migration
def change
create_table :games do |t|
t.string :play_date
t.string :date
t.timestamps null: false
end
end
end
class CreateTeams < ActiveRecord::Migration
def change
create_table :teams do |t|
t.integer :team_number
t.references :game, index: true
t.timestamps null: false
end
add_foreign_key :teams, :games
end
end
class CreatePlayers < ActiveRecord::Migration
def change
create_table :players do |t|
t.string :name
t.references :team, index: true
t.timestamps null: false
end
add_foreign_key :players, :teams
end
end
I am trying to write an Active Record query to return an object that contains nested objects for 1 game, M number of teams, N number of players. So, for example, I am expecting my returned data to look something like this:
{ "id" => "1", "play_date"=>"2016-01-28",
"teams" =>
[{"id" => "1", "game_id" => "1", "team_number" => "1",
"players" =>
[{"id" => "1", "team_id" => "1", "name" => "Jim"},
{"id" => "2", "team_id" => "1", "name" => "Bob"},
{"id" => "3", "team_id" => "1", "name" => "Sally"}
]
},
{"id" => "2", "game_id" => "1", "team_number" => "2",
"players" =>
[{"id" => "4", "team_id" => "2", "name" => "Ed"},
{"id" => "5", "team_id" => "2", "name" => "Molly"},
{"id" => "6", "team_id" => "2", "name" => "Tim"}
]
}
]
}
The closest I've been able to get this to working is the following:
#data = Player.select("players.*, teams.*").joins(team: :game).where(games: {id: params[:id]})
which returns something like:
[
#<Player id: 1, name: "Jim", team_id: 1, created_at: "2016-01-02 19:27:52", updated_at: "2016-01-02 19:27:52">,
#<Player id: 2, name: "Bob", team_id: 1, created_at: "2016-01-02 19:27:52", updated_at: "2016-01-02 19:27:52">,
#<Player id: 3, name: "Sally", team_id: 1, created_at: "2016-01-02 19:27:52", updated_at: "2016-01-02 19:27:52">,
#<Player id: 4, name: "Ed", team_id: 2, created_at: "2016-01-02 19:27:52", updated_at: "2016-01-02 19:27:52">,
#<Player id: 5, name: "Molly", team_id: 2, created_at: "2016-01-02 19:27:52", updated_at: "2016-01-02 19:27:52">,
#<Player id: 6, name: "Tim", team_id: 2, created_at: "2016-01-02 19:27:52", updated_at: "2016-01-02 19:27:52">
]
I've tried multiple variations of the above code to try to get a set of nested objects like in my expected output example, but I always get results that return only a single level of objects.
Can anyone help return results that contain nested objects? Thanks.

Answer 1

I guess I needed to take a break, I was able to figure this out now.
I think my issue was with relying on the .inspect command to check and see if my multiple levels of objects were being loaded. Turns out if I just simplified my query to:
#data = Game.joins(teams: :players).find(params[:id])
and then actually tried looping through the data in my view:
<% #data.teams.each do |team| %>
<%= team.players[0].name %>
<% end %>
This allowed me to access all of the data I needed. I'm guessing due to lazy loading (but maybe not) inspect doesn't show all of the data.