Respuestas y preguntas sobre la evaluación de habilidades de LinkedIn: Ruby on Rails

“Ruby on Rails has emerged as a popular and powerful framework for web development, conocido por su elegante sintaxis y convención sobre el enfoque de configuración. En esta guía completa, Estamos emocionados de presentar una colección seleccionada de preguntas de evaluación de habilidades y respuestas para Ruby on Rails.

Whether you’re a seasoned developer looking to enhance your skills or a newcomer eager to explore the world of modern web development, este recurso está diseñado para ayudarle a dominar Ruby on Rails y sus características innovadoras. Únase a nosotros mientras profundizamos en los fundamentos de Ruby on Rails, including MVC architecture, database integration, RESTful routing, y más, empowering you to leverage the full potential of this dynamic framework.”

Q1. When rendering a partial in a view, how would you pass local variables for rendering?

<%= render partial: "nav", selected: "about"}%>
<%= render partial: "nav", local_variables: {selected: "about"} %>
<%= render partial: "nav", locals: {selected: "about"}

Q2. Within a Rails controller, which code will prevent the parent controller’s before_action `:get_feature` from running?

skip_before_action :get_feature
skip :get_feature, except: []
prevent_action :get_feature
:redis_cache_store

Tercer trimestre. Which statement correctly describes a difference between the form helper methods `form_tag` y `form_for`?

los form_tag method is for basic forms, mientras que la form_for method is for multipart forms that include file uploads.
los form_tag method is for HTTP requests, mientras que la form_for method is for AJAX requests.
los form_tag method typically expects a URL as its first argument, mientras que la form_for method typically expects a model object.
los form_tag method is evaluated at runtime, mientras que la form_for method is precompiled and cached.

Cuarto trimestre. Qué es `before_action` (formerly known as `before_filter`)?

A trigger that is executed before an alteration of an object’s state
A method that is executed before an ActiveRecord model is saved
A callback that fires before an event is handled
A method in a controller that is executed before the controller action method

Q5. Which module can you use to encapsulate a cohesive chunk of functionality into a mixin?

ActiveSupport::Concern
RailsHelper.CommonClass
ActiveJob::Mixin
ActiveSupport::Module

Q6. In Rails, which code would you use to define a route that handles both the `PUT` y `PATCH` `REST HTTP` verbs?

put :items, include: patch
put 'items', to: 'items#update'
match 'items', to 'items#update', via: [:put, :patch]
match :items, using: put && patch

Q7. Which choice includes standard REST HTTP verbs?

GET, POST, PATCH, BORRAR
REDIRECT, RENDER, SESSION, COOKIE
ÍNDICE, SHOW, NUEVO, El objetivo es enseñarle todo lo que necesita saber para hacer que un SCADA haga lo que usted quiere que haga., EDITAR, ACTUALIZAR, DESTROY
El objetivo es enseñarle todo lo que necesita saber para hacer que un SCADA haga lo que usted quiere que haga., LEER, ACTUALIZAR, BORRAR

Q8. Which ActiveRecord query prevents SQL injection?

Product.where("name = #{@keyword}")
Product.where("name = " << @keyword}
Product.where("name = ?", @keyword
Product.where("name = " + h(@keyword)

Q9. Given this code, which statement about the database table “documentos” could be expected to be cierto?

class Document < ActiveRecord::Base
  belongs_to :documentable, polymorphic: true
end

class Product < ActiveRecord::Base
  has_many :documents, as: :documentable
end

class Service < ActiveRecord::Base
  has_many :documents, as: :documentable
end

It would include a column for :type.
It would include columns for :documentable_id y :documentable_type.
It would include columns for :documentable y :type.
It would include a column for :polymorphic_type.

Q10. Are instance variables set within a controller method accessible within a view?

Sí, any instance variables that are set in an action method on a controller can be accessed and displayed in a view.
Sí, instance variables set within an action method are accessible within a view, but only when render is explicitly called inside the action method.
No, instance variables in a controller are private and are not accessible.
No, instance variables can never be set in a controller action method.

tecnicos. When a validation of a field in a Rails model fails, where are the messages for validation errors stored?

my_model.errors[:field]
my_model.get_errors_for(:field)
my_model.field.error
my_model.all_errors.select(:field)

Q12. If a database table of users contains the following rows, y `id` is the primary key, which statement would return only an object whose `last_name` es “Cordero”?

-------------------------------

| id | first_name | last_name |
|----|------------|-----------|
| 1  | Alice      | Anderson  |
| 2  | Bob        | Buckner   |
| 3  | Carrie     | Cordero   |
| 4  | Devon      | Dupre     |
| 5  | Carrie     | Eastman   |

-------------------------------

User.where(first_name: "Carrie")
User.not.where(id: [1, 2, 4, 5])
User.find_by(first_name: "Cordero")
User.find(3)

P13. How would you generate a drop-down menu that allows the user to select from a collection of product names?

<%= select_tag(@products) %>
<%= collection_select(@products) %>
<select name="product_id"> <%= @products.each do |product| %> <option value="<%= product.id %>"/> <% end %></select>
<%= collection_select(:product, :product_id, Product.all, :id, :name) %>

Q14. For a Rails validator, how would you define an error message for the model attribute `address` with the message “This address is invalid”?

model.errors = This address is invalid
errors(model, :address) << "This address is invalid"
display_error_for(model, :address, "This address is invalid")
model.errors[:address] << "This address is invalid"

Custom Validator

P15. Given the URL helper `product_path(@product)`, which statement would be expected to be falso?

If sent using the PATCH HTTP method, the URL could be used to update a product in the database.
If sent using the POST HTTP method, the URL would create a new product in the database.
If sent using the GET HTTP method, the URL would execute the show action in ProductsController.
If sent using the DELETE HTTP method, the URL would call the destroy action by default.

Q16. Given this code, which choice would be expected to be a cierto statement if the user requests the index action?

class DocumentsController < ApplicationController
  before_action :require_login
  def index
    @documents = Document.visible.sorted
  end
end

The user’s documents will be loaded.
The index action will run normally because :index is not listed as an argument to before_action.
los require_login method will automatically log in the user before running the index action.
The index action will not be run if the require_login method calls render or redirect_to.

P17. In Rails, how would you cache a partial template that is rendered?

render partial: 'shared/menu', cached: true
render_with_cache partial: 'shared/menu'
render partial: 'shared/menu'
render partial: 'shared/menu', cached_with_variables: {}

P18. What is the reason for using Concerns in Rails?

Concerns allow modularity and code reuse in models, controllers, and other classes.
Concerns are used to separate class methods from models.
Concerns are used to increase security of Rails applications.
Concerns are used to refactor Rails views.

Q19. When using an ActiveRecord model, which method will create the model instance in memory and save it to the database?

build
new
create
save

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Respuestas y preguntas sobre la evaluación de habilidades de LinkedIn: Ruby on Rails