How to filter stacktrace in byebug

Category: Ruby :: Published at: 12.10.2021

Sometimes simple debugging with byebug is not enough and you need to dive deeper.

If you need to get the stacktrace you can simply use command:

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RSpec - How to chain .to change matcher in rubocop

Category: Ruby :: Published at: 23.09.2021

If you use rubocop and want to chain [.to change] matcher, it can be quite confusing.

Here is how you should do it correctly:

subject(:service_call) { my_service.call(car_id: id) }

let(:car) { create :car }

it "passes test" do
  expect { service_call }.to(
    change { car.brand }.to("Opel")
      .and(change { car.model }.to("Astra")
      .and(change { car.production_year }.to(1997),
  )
end


How to connect NGROK with a Rails application

Category: Ruby :: Published at: 01.07.2021

Ngrok let us to publish our local application for the world. It is very useful for example if we want to create a webhook integration.

These are simple steps to connect NGROK with your rails application:

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Rspec not_to change .and not_to change - how to do it?

Category: Ruby :: Published at: 29.06.2021

We can't chain not_to change .and not_to change in one rspec matcher call.

But the gem creators made for us some simple and very useful workaround:

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How to test raise_error matcher if it gets an error

Category: Ruby :: Published at: 23.06.2021

The problem with raise_error matcher in RSpec is common and it can be fixed in easy way.

Let's say we have situation like below:

subject(:service_call) { CarService.call }

it { expect(service_call).to raise_error(CarDatabaseConnectionError) }

If we call it like this it will get us an error.

  1) CarUpdateService when fail 
     Failure/Error: raise CarDatabaseConnectionError
     
     CarDatabaseConnectionError:
       Can't connect with a custom car database.

Why it didn't pass the spec?

The problem is here:

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Just focus on the present

Category: Better programmer :: Published at: 03.06.2021

The last chapter in the Essentialism book (by Greg McKeown) is about focusing.

It is interesting not only if you think about being programmer, but in every field of our life in general.

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