Controller action and route config for find and fill address fields using brcep gem

gistfile1.rb

# controller action
def find_cep
  begin
    # Ex: ['Avenida', 'das Americas', 'Barra da Tijuca', 'Rio de Janeiro', 'RJ', 22640100]
    address = BuscaEndereco.por_cep params[:cep]
    street = "#{address.fetch(0)} #{address.fetch(1)}"
    neighborhood = address.fetch(2)
    city = address.fetch(3)
    state = address.fetch(4)
    data = {
      street: street,
      neighborhood: neighborhood,
      city: city,
      state: state
    }
    render json: data and return
  rescue RuntimeError => e
    render :json => { message: e.message }, :status => 500 and return
  end
end


# config/routes.rb
get '/find_cep', to: 'application#find_cep'


# spec/controllers/application_controller_spec.rb
require 'spec_helper'

describe ApplicationController do
  context 'find_cep' do
    it 'should return a json with address fields if find sucessfully' do
      BuscaEndereco.should_receive(:por_cep).with('22.640-100') {["Avenida", "das Americas", "Barra da Tijuca", "Rio de Janeiro", "RJ", "22640100"]}
      get :find_cep, { :cep => '22.640-100' }
      expect(response.body).to eq('{"street":"Avenida das Americas","neighborhood":"Barra da Tijuca","city":"Rio de Janeiro","state":"RJ"}')
    end

    it 'should return a json with an error if does not find sucessfully' do
      BuscaEndereco.should_receive(:por_cep).with('00.000-000') { raise(RuntimeError, 'O CEP informado possui um formato invalido.')}
      get :find_cep, { :cep => '00.000-000' }
      expect(response.body).to eq('{"message":"O CEP informado possui um formato invalido."}')
    end
  end
end