• Ruby comes with an excellent CSV library that was formerly known as Faster CSV in Ruby 1.8.
• We’ll use this library to generate our CSV data.
• As it’s part of the standard library all we have to do is require it and we’ll do this in our application’s config file.

Learn Ruby On Rails Tutorials - Ruby On Rails Csv - Ruby On Rails Examples

Steps:

• Add a controller and make sure you handle the csv request.
• Add a route to point to your controller
• Add a model with the class method to_csv

Learn Ruby On Rails Tutorials - Export Records Csv File Rails - Ruby On Rails Examples

Controller

• The Rails controller is the logical center of your application. It coordinates the interaction between the user, the views, and the model. The controller is also a home to a number of important ancillary services.
• It is responsible for routing external requests to internal actions. It handles people-friendly URLs extremely well.
• It manages caching, which can give applications orders-of-magnitude performance boosts.
• It manages helper modules, which extend the capabilities of the view templates without bulking up their code.
• It manages sessions, giving users the impression of an ongoing interaction with our applications.

# users_controller.rb
class UsersController < ApplicationController
  def index
    @users = User.all
    respond_to do |format|
      format.html
      format.csv { send_data @users.to_csv, filename: "users-#{Date.today}.csv" }
    end
  end

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Routes

• The routing module provides URL rewriting in native Ruby.
• It's a way to redirect incoming requests to controllers and actions.
• It replaces the mod_rewrite rules.
• Best of all, Rails' Routing works with any web server. Routes are defined in app/config/routes.rb.

# routes.rb

...

resources :users, only: :index

...

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Model

# user.rb
class User < ActiveRecord::Base
  def self.to_csv
    attributes = %w{id email name}
    CSV.generate(headers: true) do |csv|
      csv << attributes
      all.each do |user|
        csv << attributes.map{ |attr| user.send(attr) }
      end
    end
  end

  def name
    "#{first_name} #{last_name}"
  end
end

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Core custom methods:

• to_csv will and will map out the "id, email, name" values of your model collection and then generate a CSV string.

Rails core methods for this feature:

• #send_data Sends the given binary data to the browser.
• This method is similar to render :text => data, but also allows you to specify whether the browser should display the response as a file attachment (i.e. in a download dialog) or as inline data.

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