tab/app/controllers/transactions_controller.rb

class TransactionsController < ApplicationController
  skip_before_filter :verify_authenticity_token, only: :create

  before_action :authenticate_user!, except: :create
  before_action :authenticate_user_or_client!, only: :create

  # This line MUST be placed after authentication
  load_and_authorize_resource

  def index
    @transactions = Transaction.all
  end

  def create
    @transaction = Transaction.new(transaction_params)
    respond_to do |format|
      format.html do
        @user = current_user
        if @transaction.save
          flash[:success] = "Transaction created"
          redirect_to current_user
        else
          render "users/show"
        end
      end

      format.json do
        head(@transaction.save ? :created : :unprocessable_entity)
      end
    end
  end

  private

  def transaction_params
    t = params.require(:transaction)
          .permit(:debtor, :creditor, :message, :euros, :cents)

    {
      debtor: User.find_by(name: t[:debtor]) || User.zeus,
      creditor: User.find_by(name: t[:creditor]) || User.zeus,
      issuer: current_client || current_user,
      amount: (float(t[:euros]) * 100 + float(t[:cents])).to_i,
      message: t[:message]
    }
  end

  def float arg
    if arg.is_a? String then arg.sub!(',', '.') end
    arg.to_f
  end
end