Understanding helper and helper_method in Ruby on Rails - Explained

├Źndice
  1. Introduction
  2. What is a helper?
  3. Using a helper in a view
  4. What is a helper_method?
  5. Conclusion

Introduction

When working with Ruby on Rails, it's common to come across the terms "helper" and "helper_method". These are important concepts that can help simplify your code and make it more organized. In this article, we'll explain what these concepts are and how they can be used in Ruby on Rails.

What is a helper?

A helper is a module that contains methods that can be used throughout your Rails application. These methods can be used to perform common tasks, such as formatting text or generating HTML. Helpers are typically used in views, but they can also be used in controllers and models.

To create a helper, you simply need to create a new file in the app/helpers directory with a name that ends in _helper.rb. For example, if you wanted to create a helper for formatting dates, you could create a file called date_helper.rb.

Using a helper in a view

To use a helper in a view, you simply need to include the helper module in the view. This can be done by using the helper method, like this:

<% helper :date %>
<%= format_date(Date.today) %>

In this example, we're including the date helper module and then calling the format_date method to format today's date.

What is a helper_method?

A helper_method is a method that can be used in both controllers and views. These methods are typically used for tasks that are common to both controllers and views, such as setting variables or generating URLs.

To create a helper_method, you simply need to define the method in the ApplicationController class and then mark it as a helper method using the helper_method method.

For example, let's say you wanted to create a helper method for generating URLs. You could define the method like this:

class ApplicationController < ActionController::Base
  helper_method :generate_url

  def generate_url(id)
    "http://example.com/#{id}"
  end
end

In this example, we're defining a method called generate_url and then marking it as a helper method using the helper_method method. This allows us to use the generate_url method in both controllers and views.

Conclusion

Helpers and helper_methods are important concepts in Ruby on Rails that can help simplify your code and make it more organized. By using helpers and helper_methods, you can create reusable code that can be used throughout your Rails application.

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