COMO USAR e trabalhar com Code Review no Visual Studio Code

Não é todo programador que gosta de compartilhar o seu trabalho ou até mesmo receber feedbacks de como o seu código foi escrito, mas o Code Review é cada vez mais comum em empresas do mundo todo.

Conheça uma extensão para Visual Studio Code e comece a trabalhar com Code Review em seu próximo projeto. Essa é a sua chance de saber COMO USAR e trabalhar com Code Review no Visual Studio Code.

#visual studio code #code review #visual studio #code

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COMO USAR e trabalhar com Code Review no Visual Studio Code
Monty  Boehm

Monty Boehm


How to Use Hotwire Rails


We are back with another exciting and much-talked-about Rails tutorial on how to use Hotwire with the Rails application. This Hotwire Rails tutorial is an alternate method for building modern web applications that consume a pinch of JavaScript.

Rails 7 Hotwire is the default front-end framework shipped with Rails 7 after it was launched. It is used to represent HTML over the wire in the Rails application. Previously, we used to add a hotwire-rails gem in our gem file and then run rails hotwire: install. However, with the introduction of Rails 7, the gem got deprecated. Now, we use turbo-rails and stimulus rails directly, which work as Hotwire’s SPA-like page accelerator and Hotwire’s modest JavaScript framework.

What is Hotwire?

Hotwire is a package of different frameworks that help to build applications. It simplifies the developer’s work for writing web pages without the need to write JavaScript, and instead sending HTML code over the wire.

Introduction to The Hotwire Framework:

1. Turbo:

It uses simplified techniques to build web applications while decreasing the usage of JavaScript in the application. Turbo offers numerous handling methods for the HTML data sent over the wire and displaying the application’s data without actually loading the entire page. It helps to maintain the simplicity of web applications without destroying the single-page application experience by using the below techniques:

Turbo Frames: Turbo Frames help to load the different sections of our markup without any dependency as it divides the page into different contexts separately called frames and updates these frames individually.
Turbo Drive: Every link doesn’t have to make the entire page reload when clicked. Only the HTML contained within the tag will be displayed.
Turbo Streams: To add real-time features to the application, this technique is used. It helps to bring real-time data to the application using CRUD actions.

2. Stimulus

It represents the JavaScript framework, which is required when JS is a requirement in the application. The interaction with the HTML is possible with the help of a stimulus, as the controllers that help those interactions are written by a stimulus.

3. Strada

Not much information is available about Strada as it has not been officially released yet. However, it works with native applications, and by using HTML bridge attributes, interaction is made possible between web applications and native apps.

Simple diagrammatic representation of Hotwire Stack:

Hotwire Stack

Prerequisites For Hotwire Rails Tutorial

As we are implementing the Ruby on Rails Hotwire tutorial, make sure about the following installations before you can get started.

  • Ruby on Rails
  • Hotwire gem
  • PostgreSQL/SQLite (choose any one database)
  • Turbo Rails
  • Stimulus.js

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Create a new Rails Project

Find the following commands to create a rails application.

mkdir ~/projects/railshotwire
cd ~/projects/railshotwire
echo "source ''" > Gemfile
echo "gem 'rails', '~> 7.0.0'" >> Gemfile
bundle install  
bundle exec rails new . --force -d=postgresql

Now create some files for the project, up till now no usage of Rails Hotwire can be seen.
Fire the following command in your terminal.

  • For creating a default controller for the application
echo "class HomeController < ApplicationController" > app/controllers/home_controller.rb
echo "end" >> app/controllers/home_controller.rb
  • For creating another controller for the application
echo "class OtherController < ApplicationController" > app/controllers/other_controller.rb
echo "end" >> app/controllers/home_controller.rb
  • For creating routes for the application
echo "Rails.application.routes.draw do" > config/routes.rb
echo '  get "home/index"' >> config/routes.rb
echo '  get "other/index"' >> config/routes.rb
echo '  root to: "home#index"' >> config/routes.rb
echo 'end' >> config/routes.rb
  • For creating a default view for the application
mkdir app/views/home
echo '<h1>This is Rails Hotwire homepage</h1>' > app/views/home/index.html.erb
echo '<div><%= link_to "Enter to other page", other_index_path %></div>' >> app/views/home/index.html.erb
  • For creating another view for the application
mkdir app/views/other
echo '<h1>This is Another page</h1>' > app/views/other/index.html.erb
echo '<div><%= link_to "Enter to home page", root_path %></div>' >> app/views/other/index.html.erb
  • For creating a database and schema.rb file for the application
bin/rails db:create
bin/rails db:migrate
  • For checking the application run bin/rails s and open your browser, your running application will have the below view.

Rails Hotwire Home Page

Additionally, you can clone the code and browse through the project. Here’s the source code of the repository: Rails 7 Hotwire application

Now, let’s see how Hotwire Rails can work its magic with various Turbo techniques.

Hotwire Rails: Turbo Drive

Go to your localhost:3000 on your web browser and right-click on the Inspect and open a Network tab of the DevTools of the browser.

Now click on go to another page link that appears on the home page to redirect from the home page to another page. In our Network tab, we can see that this action of navigation is achieved via XHR. It appears only the part inside HTML is reloaded, here neither the CSS is reloaded nor the JS is reloaded when the navigation action is performed.

Hotwire Rails Turbo Drive

By performing this action we can see that Turbo Drive helps to represent the HTML response without loading the full page and only follows redirect and reindeer HTML responses which helps to make the application faster to access.

Hotwire Rails: Turbo Frame

This technique helps to divide the current page into different sections called frames that can be updated separately independently when new data is added from the server.
Below we discuss the different use cases of Turbo frame like inline edition, sorting, searching, and filtering of data.

Let’s perform some practical actions to see the example of these use cases.

Make changes in the app/controllers/home_controller.rb file


class HomeController < ApplicationController
   def turbo_frame_form
   def turbo_frame submit
      extracted_anynumber = params[:any][:anynumber]
      render :turbo_frame_form, status: :ok, locals: {anynumber: extracted_anynumber,      comment: 'turbo_frame_submit ok' }

Turbo Frame

Add app/views/home/turbo_frame_form.html.erb file to the application and add this content inside the file.



    <%= turbo_frame_tag 'anyframe' do %>
          <h2>Frame view</h2>
          <%= form_with scope: :any, url: turbo_frame_submit_path, local: true do |form| %>
              <%= form.label :anynumber, 'Type an integer (odd or even)', 'class' => 'my-0  d-inline'  %>
              <%= form.text_field :anynumber, type: 'number', 'required' => 'true', 'value' => "#{local_assigns[:anynumber] || 0}",  'aria-describedby' => 'anynumber' %>
              <%= form.submit 'Submit this number', 'id' => 'submit-number' %>
          <% end %>
        <h2>Data of the view</h2>
        <pre style="font-size: .7rem;"><%= JSON.pretty_generate(local_assigns) %></pre> 
    <% end %>


Add the content inside file

Make some adjustments in routes.rb


Rails.application.routes.draw do
  get 'home/index'
  get 'other/index'

  get '/home/turbo_frame_form' => 'home#turbo_frame_form', as: 'turbo_frame_form'
  post '/home/turbo_frame_submit' => 'home#turbo_frame_submit', as: 'turbo_frame_submit'

  root to: "home#index"
  • Next step is to change homepage view in app/views/home/index.html.erb


<h1>This is Rails Hotwire home page</h1>
<div><%= link_to "Enter to other page", other_index_path %></div>

<%= turbo_frame_tag 'anyframe' do %>        
      <h2>Home view</h2>
      <%= form_with scope: :any, url: turbo_frame_submit_path, local: true do |form| %>
          <%= form.label :anynumber, 'Type an integer (odd or even)', 'class' => 'my-0  d-inline'  %>
          <%= form.text_field :anynumber, type: 'number', 'required' => 'true', 'value' => "#{local_assigns[:anynumber] || 0}",  'aria-describedby' => 'anynumber' %>
          <%= form.submit 'Submit this number', 'id' => 'submit-number' %>
      <% end %>
<% end %>

Change HomePage

After making all the changes, restart the rails server and refresh the browser, the default view will appear on the browser.

restart the rails serverNow in the field enter any digit, after entering the digit click on submit button, and as the submit button is clicked we can see the Turbo Frame in action in the below screen, we can observe that the frame part changed, the first title and first link didn’t move.

submit button is clicked

Hotwire Rails: Turbo Streams

Turbo Streams deliver page updates over WebSocket, SSE or in response to form submissions by only using HTML and a series of CRUD-like operations, you are free to say that either

  • Update the piece of HTML while responding to all the other actions like the post, put, patch, and delete except the GET action.
  • Transmit a change to all users, without reloading the browser page.

This transmit can be represented by a simple example.

  • Make changes in app/controllers/other_controller.rb file of rails application


class OtherController < ApplicationController

  def post_something
    respond_to do |format|
      format.turbo_stream {  }


file of rails application

Add the below line in routes.rb file of the application


post '/other/post_something' => 'other#post_something', as: 'post_something'
Add the below line

Superb! Rails will now attempt to locate the app/views/other/post_something.turbo_stream.erb template at any moment the ‘/other/post_something’ endpoint is reached.

For this, we need to add app/views/other/post_something.turbo_stream.erb template in the rails application.


<turbo-stream action="append" target="messages">
    <div id="message_1">This changes the existing message!</div>
Add template in the rails application

This states that the response will try to append the template of the turbo frame with ID “messages”.

Now change the index.html.erb file in app/views/other paths with the below content.


<h1>This is Another page</h1>
<div><%= link_to "Enter to home page", root_path %></div>

<div style="margin-top: 3rem;">
  <%= form_with scope: :any, url: post_something_path do |form| %>
      <%= form.submit 'Post any message %>
  <% end %>
  <turbo-frame id="messages">
    <div>An empty message</div>
change the index.html.erb file
  • After making all the changes, restart the rails server and refresh the browser, and go to the other page.

go to the other page

  • Once the above screen appears, click on the Post any message button

Post any message button

This action shows that after submitting the response, the Turbo Streams help the developer to append the message, without reloading the page.

Another use case we can test is that rather than appending the message, the developer replaces the message. For that, we need to change the content of app/views/other/post_something.turbo_stream.erb template file and change the value of the action attribute from append to replace and check the changes in the browser.


<turbo-stream action="replace" target="messages">
    <div id="message_1">This changes the existing message!</div>

change the value of the action attributeWhen we click on Post any message button, the message that appear below that button will get replaced with the message that is mentioned in the app/views/other/post_something.turbo_stream.erb template

click on Post any message button


There are some cases in an application where JS is needed, therefore to cover those scenarios we require Hotwire JS tool. Hotwire has a JS tool because in some scenarios Turbo-* tools are not sufficient. But as we know that Hotwire is used to reduce the usage of JS in an application, Stimulus considers HTML as the single source of truth. Consider the case where we have to give elements on a page some JavaScript attributes, such as data controller, data-action, and data target. For that, a stimulus controller that can access elements and receive events based on those characteristics will be created.

Make a change in app/views/other/index.html.erb template file in rails application


<h1>This is Another page</h1>
<div><%= link_to "Enter to home page", root_path %></div>

<div style="margin-top: 2rem;">
  <%= form_with scope: :any, url: post_something_path do |form| %>
      <%= form.submit 'Post something' %>
  <% end %>
  <turbo-frame id="messages">
    <div>An empty message</div>

<div style="margin-top: 2rem;">
  <div data-controller="hello">
    <input data-hello-target="name" type="text">
    <button data-action="click->hello#greet">
    <span data-hello-target="output">

Make A changeMake changes in the hello_controller.js in path app/JavaScript/controllers and add a stimulus controller in the file, which helps to bring the HTML into life.


import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = [ "name", "output" ]

  greet() {
    this.outputTarget.textContent =
      `Hello, ${this.nameTarget.value}!`

add a stimulus controller in the fileGo to your browser after making the changes in the code and click on Enter to other page link which will navigate to the localhost:3000/other/index page there you can see the changes implemented by the stimulus controller that is designed to augment your HTML with just enough behavior to make it more responsive.

With just a little bit of work, Turbo and Stimulus together offer a complete answer for applications that are quick and compelling.

Using Rails 7 Hotwire helps to load the pages at a faster speed and allows you to render templates on the server, where you have access to your whole domain model. It is a productive development experience in ROR, without compromising any of the speed or responsiveness associated with SPA.


We hope you were satisfied with our Rails Hotwire tutorial. Write to us at for any query that you want to resolve, or if you want us to share a tutorial on your query.

For more such solutions on RoR, check out our Ruby on Rails Tutorials. We will always strive to amaze you and cater to your needs.

Original article source at:

#rails #ruby 

COMO USAR e trabalhar com Code Review no Visual Studio Code

Não é todo programador que gosta de compartilhar o seu trabalho ou até mesmo receber feedbacks de como o seu código foi escrito, mas o Code Review é cada vez mais comum em empresas do mundo todo.

Conheça uma extensão para Visual Studio Code e comece a trabalhar com Code Review em seu próximo projeto. Essa é a sua chance de saber COMO USAR e trabalhar com Code Review no Visual Studio Code.

#visual studio code #code review #visual studio #code

Fannie  Zemlak

Fannie Zemlak


Softagram - Making Code Reviews Humane

The story of Softagram is a long one and has many twists. Everything started in a small company long time ago, from the area of static analysis tools development. After many phases, Softagram is focusing on helping developers to get visual feedback on the code change: how is the software design evolving in the pull request under review.

Benefits of code change visualization and dependency checks

While it is trivial to write 20 KLOC apps without help of tooling, usually things start getting complicated when the system grows over 100 KLOC.

The risk of god class anti-pattern, and the risk of mixing up with the responsibilities are increasing exponentially while the software grows larger.

To help with that, software evolution can be tracked safely with explicit dependency change reports provided automatically to each pull request. Blocking bad PR becomes easy, and having visual reports also has a democratizing effect on code review.

Example visualization

Basic building blocks of Softagram

  • Architectural analysis of the code, identifying how delta is impacting to the code base. Language specific analyzers are able to extract the essential internal/external dependency structures from each of the mainstream programming languages.

  • Checking for rule violations or anomalies in the delta, e.g. finding out cyclical dependencies. Graph theory comes to big help when finding out unwanted or weird dependencies.

  • Building visualization for humans. Complex structures such as software is not easy to represent without help of graph visualization. Here comes the vital role of change graph visualization technology developed within the last few years.

#automated-code-review #code-review-automation #code-reviews #devsecops #software-development #code-review #coding #good-company

Samanta  Moore

Samanta Moore


Guidelines for Java Code Reviews

Get a jump-start on your next code review session with this list.

Having another pair of eyes scan your code is always useful and helps you spot mistakes before you break production. You need not be an expert to review someone’s code. Some experience with the programming language and a review checklist should help you get started. We’ve put together a list of things you should keep in mind when you’re reviewing Java code. Read on!

1. Follow Java Code Conventions

2. Replace Imperative Code With Lambdas and Streams

3. Beware of the NullPointerException

4. Directly Assigning References From Client Code to a Field

5. Handle Exceptions With Care

#java #code quality #java tutorial #code analysis #code reviews #code review tips #code analysis tools #java tutorial for beginners #java code review

Philosophy of Code Review


Code reviews not only prevent potential (future) bugs early on, it is an effective way to communicate changes and sharing learnings within a team. There does not exist a geekier way to engage an engineer than code reviews.

A good code review process should lead to open development environment and increase in knowledge sharing and geek index of the team along with fewer bugs and regression.


An effective code review would cover all major aspects of good code, that are:

  1. General (Low level) — Effective use of CS concepts, hygiene, language constructs and its ecosystem
  2. Design — Adherence to design principles and patterns (Esp. when new module is being developed) and adherence to the existing design (in case of incremental development)
  3. Functionality — Coverage of business use cases and test cases to support it

Flavours of Reviews:

  • General Review
  • Code Design Review
  • Functional Review

General Review:

General review can be done by anybody in the team. I’d encourage rather multiple members should review major releases.

At this level, the expectation is to review the code from solely implementation tech point of view:

  • Effective use of various CS concepts such as DS/Algo, Concurrency, Locking etc. Review algorithms and ensure sufficient documentation. Lookout for opportunities of optimisations. Ensure there are unit tests for both possible and impossible state of the application.
  • Effective use of language constructs and best practices. Most of the best practices are summarised in some of the popular books such as Effective Java, Code Complete, Pragmatic Programmer, Java Concurrency in Practice etc.
  • Effective use of language ecosystem such as standard libraries (data structures etc), unit test frameworks etc. We should encourage reuse of battle tested code as much as possible.
  • Hygiene such as style guide, documentation, type safety, resource management, object construction, DI, validations etc.

Code Design Review:

In this phase, the reviewer needs to be familiar with the domain to justify the design choices. Depending on the nature of the change, the review can have different expectations:

  • When a new product is released: Ensure that the code adheres to the design document drafted prior to implementation (encourage reviewees to submit one if not present). In any unexpected cases where the design doc is not already reviewed or there is no design doc, the reviewer needs to review the contracts to ensure they model the domain properly.
  • When changes are in existing product: The reviewer must ensure that the changes adhere to the established design of the product. And that the change honours the constraints of the product or affects all the constraints uniformly (rather than conditionally)

On a general note, the review must ensure:

  • DRY — don’t repeat yourself — reviewer needs to ensure DRYness of logic and abstraction rather than just code.
  • Single Responsibility Principle (SRP) — Functions are modular, concise and handle one and only one concern
  • Interfaces communicate a clear intention, without useless methods
  • Separation of concerns needs to be reviewed here.
  • Designed for concurrent environment — objects declare thread safety contracts
  • OOPs tenets — identification of state and it’s encapsulation, responsibility of the objects and the protocol of communication between the objects
  • Design is extensible; one popular way is to ensure right design pattern are used if there was an opportunity (for eg: algos should be pluggable through Strategy pattern et al)
  • Testability — the functionality must be unit testable.

Please note that this is an indicative list and not an exhaustive list. Please feel free to evaluate on more dimensions from your experience. May refer the books (mentioned in General Review section)

Functional Review:

This is the most important step of the review. Reviewer must be familiar and contributor to the product and understands the features and constraints alike. Apart from dedicated regression suite, reviewer’s familiarity gives unique opportunity to uncover unforeseen scenarios. Here reviewer need to ensure that there are no regressions because of the change. Additionally, reviewer should review the unit tests and integration tests and make sure they test the behaviour of the functionality in all possible states of the application (possible and impossible state)

Formally, reviewer need to ensure that

  1. The Domain Modelling is done right (in case LLD - CD/ERD etc are not thoroughly reviewed)
  2. The code is sufficiently instrumented (biz and system instrumentation)
  3. the relationships between abstractions and classes are clearly laid out (and easily derivable from the code)
  4. Security aspects such as
  5. Input and output validation

  6. Defence against known vulnerabilities

  7. Boundary checks (Eg array OOB) that may cause overflows and DoS

  8. Vulnerabilities in platforms and libraries (basic audit of known issues should do)

#developer #code-review #code #visual studio code #visual studio