Ruby on Rails Methods

Learn Ruby on Rails methods with an example: explore the power of the Rails framework to create custom, dynamic web applications.

Ruby on Rails Methods

Ruby on Rails is a popular web framework used to quickly build web applications. This framework is built on the Ruby language, and includes various methods to help developers create powerful applications quickly. In this article, we will take a look at some of the most commonly used Ruby on Rails methods.

Active Record

Active Record is a Ruby on Rails method that helps developers interact with databases. It is used to create, read, update, and delete data from the database. Active Record allows developers to write object-oriented code to interact with the database without writing any SQL queries. For example, let's say we have a model called User and we want to retrieve a user from the database using the user's ID. We can use the find method to do this:


user = User.find(3)

This will return the user object with the ID of 3. We can also use Active Record to create, update, and delete data from the database. For example, if we wanted to create a new user in the database, we could use the create method:


user = User.create(name: 'John Doe', email: '[email protected]')

This will create a new user in the database with the name and email address provided. We can also use the update method to update existing user data:


user.update(name: 'Jane Doe')

This will update the user's name to Jane Doe. Finally, we can use the destroy method to delete a user from the database:


user.destroy

This will delete the user from the database. Active Record is a powerful and easy to use tool for interacting with databases in Ruby on Rails.

Action View

Action View is another popular Ruby on Rails method. It is used to create views for web applications. Views are the user interface of a web application and are usually written in HTML. Action View allows us to embed Ruby code in our views to make them dynamic. For example, if we wanted to display a list of users in our view, we could use the each method:


<ul>
  <% @users.each do |user| %>
    <li><%= user.name %></li>
  <% end %>
</ul>

This will loop through the list of users and display each one in a list item. Action View is a powerful method for creating dynamic views in Ruby on Rails.

Action Controller

Action Controller is another popular Ruby on Rails method. It is used to create controllers that handle requests from the user. Controllers are responsible for handling user input and performing the appropriate action. For example, if we wanted to create a controller to handle a user login, we could use the post method:


def login
  if request.post?
    user = User.find_by(email: params[:email])
    # authenticate user
    if user.authenticate(params[:password])
      # log user in
      session[:user_id] = user.id
      redirect_to root_path
    else
      flash[:error] = "Invalid email or password"
    end
  end
end

This controller will handle a POST request from the user and attempt to log them in. If the user's credentials are valid, they will be logged in and redirected to the root path. If the credentials are invalid, an error message will be displayed. Action Controller is a powerful tool for handling requests in Ruby on Rails.

These are just some of the many Ruby on Rails methods available to developers. With these methods, developers can quickly create powerful web applications with Ruby on Rails.

Ruby on Rails

Ruby on Rails Methods