Pass in MODEL_id to another model params - ruby-on-rails

Question

I have two models: Game and Assignment. When I create a Game, I want to automaticall create an Assignment to go along with that game, hence the association between the two. In my Game controller I have:
def create
#game = Game.new(game_params)
#assignment = Assignment.new(assignment_params)
respond_to do |format|
if #game.save
format.html { redirect_to #game, notice: "Game was successfully created." }
format.json { render :show, status: :created, location: #game }
else
format.html { render :new, status: :unprocessable_entity }
format.json { render json: #game.errors, status: :unprocessable_entity }
end
end
end
private
def game_params
params.require(:game).permit(:home_team, :away_team)
end
def assignment_params
params.require(:assignment).permit(#game.game_id)
end
end
How do I pass in the game_id to the Assignment params when the Game is created? My models below incase they're needed. There is a game_id column in my Assignment model.
class Game < ApplicationRecord
has_one :assignment, dependent: :destroy
has_many :users, through: :assignments
end
class Assignment < ApplicationRecord
belongs_to :game
belongs_to :center_referee, class_name: 'User', foreign_key: "user_id"
belongs_to :assistant_referee_1, class_name: 'User', foreign_key: "user_id"
belongs_to :assistant_referee_2, class_name: 'User', foreign_key: "user_id"
end
Game Form
<%= simple_form_for(#game) do |f| %>
<%= f.error_notification %>
<%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>
<div class="form-inputs">
<%= f.input :home_team %>
<%= f.input :away_team %>
</div>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>
Game Controller
def new
#game = Game.new
end
# POST /games or /games.json
def create
#game = Game.new(game_params)
respond_to do |format|
if #game.save
format.html { redirect_to #game, notice: "Game was successfully created." }
format.json { render :show, status: :created, location: #game }
else
format.html { render :new, status: :unprocessable_entity }
format.json { render json: #game.errors, status: :unprocessable_entity }
end
end
end

Answer 1

Right of the top of my head, you could simply run a simple callback inside the Game model as follows:
after_create :create_assignment
def create_assignment
Assignment.create(game_id: id, center_referee_id: , assistant_referee_1_id:, assistant_referee_2_id:)
end
This way you handle it once at the model level. Every game created automatically creates an assignment.
Also if the referees are not required, you may pass an optional: true flag to the belongs_to in the assignment model. that way you can safely create the games. because currently, it is not clear how you're getting the referee details from.