pokemon.trade/app/controllers/pokemon_controller.rb

require './lib/pkparse/client'

class PokemonController < ApplicationController
  def index
    @pokemon = Pokemon.all
  end

  def show
    @pokemon = Pokemon.find(params[:id])
  end

  def new
    @pokemon = Pokemon.new
  end

  def create
    @pokemon = Pokemon.new(new_pokemon_params)

    if @pokemon.save
      redirect_to pokemon_path(@pokemon)
    else
      render :new
    end
  end

  def destroy
    pokemon = Pokemon.find(params[:id])
    if pokemon.destroy
      flash.now[:notice] = "Pokemon successfuly deleted."
      redirect_to pokemon_index_path
    else
      flash.now[:alert] = "Failed to delete pokemon."
      render :show
    end
  end

  def upload
    files = params[:pokemon]
    response = PKParse::Client.new(files).parse

    saved = false

    Pokemon.transaction do
      saved = Pokemon.create!(response.pokemon.map(&:to_h))
    end

    if saved
      redirect_to pokemon_index_path
    else
      flash.now[:alert] = "Failed to commit the uploaded pokemon."
      @pokemon = Pokemon.new
      render :new
    end
  rescue PKParse::Error => e
    flash.now[:alert] = e.message
    @pokemon = Pokemon.new
    render :new
  end

  private

  def new_pokemon_params
    params.require(:pokemon).permit(
      :id, :pokedex_number, :nickname
    )
  end
end