controllers.rb

# GIVEN TWO CONTROLLERS, CatsController and DogsController:


class CatsController < ApplicationController
  before_action :set_cat, only: [:show, :edit, :update, :destroy]
  def new
    @cat = Cat.new
  end


  def create
    @cat = Cat.new(cat_params)
    if @cat.save
      flash[:notice] = I18n.t('cat.create.success')
      redirect_to cat_path(@cat)
    else
      flash[:alert] = @cat.errors.full_messages
      render :new
    end
  end


  def index
    @cats = Cat.all
  end


  def show; end


  def edit; end


  def update
    @cat.attributes = cat_params
    if @cat.save
      flash[:notice] = I18n.t('cat.update.success')
      redirect_to cat_path(@cat)
    else
      flash[:alert] = @cat.errors.full_messages
      render :edit
    end
  end


  def destroy
    @cat.destroy!
    flash[:notice] = I18n.t('cat.destroy.success')
  rescue ActiveRecord::RecordNotDestroyed => error
    flash[:alert] = I18n.t('cat.destroy.fail', error.record.errors)
    render :show
  end


  private


  def set_cat
    @cat = Cat.find(params[:id])
  end


  def cat_params
    params.require(:cat).permit(:race, :color, :gender, :age)
  end
end




class DogsController < ApplicationController
  before_action :set_dog, only: [:show, :edit, :update, :destroy]
  def new
    @dog = Dog.new
  end


  def create
    @dog = Dog.new(dog_params)
    if @dog.save
      flash[:notice] = I18n.t('dog.create.success')
      redirect_to dog_path(@dog)
    else
      flash[:alert] = @dog.errors.full_messages
      render :new
    end
  end


  def index
    @dogs = Dog.all
  end


  def show; end


  def edit; end


  def update
    @dog.attributes = dog_params
    if @dog.save
      flash[:notice] = I18n.t('dog.update.success')
      redirect_to dog_path(@dog)
    else
      flash[:alert] = @dog.errors.full_messages
      render :edit
    end
  end


  def destroy
    @dog.destroy!
    flash[:notice] = I18n.t('dog.destroy.success')
  rescue ActiveRecord::RecordNotDestroyed => error
    flash[:alert] = I18n.t('dog.destroy.fail', error.record.errors)
    render :show
  end


  private


  def set_dog
    @dog = Dog.find(params[:id])
  end


  def dog_params
    params.require(:dog).permit(:race, :color, :gender, :age)
  end
end




# EXERCISE: Both controllers are exactly the same. Unify them so that we can do:
class CatsController < ApplicationController
  include GenericControllerConcern


  resource_name :cat
end


class DogsController < ApplicationController
  include GenericControllerConcern


  resource_name :dog
end