easy-going-rails/app/controllers/scores_controller.rb

# ScoresController define Score and Grade interactions
class ScoresController < ApplicationController
  include Pagy::Backend

  before_action :set_score, only: %i[show edit update destroy]

  # GET /scores
  def index
    @pagy, @scores = pagy(Score.all)
  end

  # GET /scores/1
  def show; end

  # GET /scores/new
  def new
    @score = Score.new
  end

  # GET /scores/1/edit
  def edit; end

  # POST /scores
  def create
    @score = Score.new(score_params)

    if @score.save
      redirect_to @score, notice: 'Score was successfully created.'
    else
      render :new, status: :unprocessable_entity
    end
  end

  # PATCH/PUT /scores/1
  def update
    if @score.update(score_params)
      redirect_to @score, notice: 'Score was successfully updated.', status: :see_other
    else
      render :edit, status: :unprocessable_entity
    end
  end

  # DELETE /scores/1
  def destroy
    @score.destroy!
    redirect_to scores_url, notice: 'Score was successfully destroyed.', status: :see_other
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_score
    @score = Score.find(params[:id])
    @score.grade
  end

  # Only allow a list of trusted parameters through.
  def score_params
    params.require(:score).permit(:name, :grade)
  end
end