budget/app/controllers/credit_card_bills_controller.rb

class CreditCardBillsController < ApplicationController
  before_action :set_credit_card_bill, only: %i[show edit update destroy]

  # GET /credit_card_bills or /credit_card_bills.json
  def index
    @credit_card_bills = CreditCardBill.all
  end

  # GET /credit_card_bills/1 or /credit_card_bills/1.json
  def show
  end

  # GET /credit_card_bills/new
  def new
    @credit_card_bill = CreditCardBill.new
  end

  # GET /credit_card_bills/1/edit
  def edit
  end

  # POST /credit_card_bills or /credit_card_bills.json
  def create
    @credit_card_bill = CreditCardBill.new(credit_card_bill_params)

    respond_to do |format|
      if @credit_card_bill.save
        format.html { redirect_to credit_card_bill_url(@credit_card_bill), notice: "Credit card bill was successfully created." }
        format.json { render :show, status: :created, location: @credit_card_bill }
      else
        format.html { render :new, status: :unprocessable_entity }
        format.json { render json: @credit_card_bill.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /credit_card_bills/1 or /credit_card_bills/1.json
  def update
    respond_to do |format|
      if @credit_card_bill.update(credit_card_bill_params)
        format.html { redirect_to credit_card_bill_url(@credit_card_bill), notice: "Credit card bill was successfully updated." }
        format.json { render :show, status: :ok, location: @credit_card_bill }
      else
        format.html { render :edit, status: :unprocessable_entity }
        format.json { render json: @credit_card_bill.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /credit_card_bills/1 or /credit_card_bills/1.json
  def destroy
    @credit_card_bill.destroy

    respond_to do |format|
      format.html { redirect_to credit_card_bills_url, notice: "Credit card bill was successfully destroyed." }
      format.json { head :no_content }
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_credit_card_bill
    @credit_card_bill = CreditCardBill.find(params[:id])
  end

  # Only allow a list of trusted parameters through.
  def credit_card_bill_params
    params.require(:credit_card_bill).permit(:description, :amount)
  end
end