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Cookies and Sessions Lab

Learning Goals

  • Use the session hash to persist data across multiple requests

Introduction

In this lab, you'll be building out a blog paywall feature by using the session hash to keep track of how many page views a user has made.

There is some starter code in place for a Rails API backend and a React frontend. To get set up, run:

$ bundle install
$ rails db:migrate db:seed
$ npm install --prefix client

You can work on this lab by running the tests with learn test. It will also be helpful to see what's happening during the request/response cycle by running the app in the browser. You can run the Rails server with:

$ rails s

And you can run React in another terminal with:

$ npm start --prefix client

You don't have to make any changes to the React code to get this lab working.

Instructions

Our app will keep track of how many blog posts a user has viewed by using the session hash. Each user can view a maximum of three articles before seeing the paywall.

When a user makes a GET request to /articles/:id, the following should happen:

  • If this is the first request this user has made, set session[:page_views] to an initial value of 0.
    • Hint: consider using ||= to set this initial value!
  • For every request to /articles/:id, increment the value of session[:page_views] by 1.
  • If the user has viewed 3 or fewer pages, render a JSON response with the article data.
  • If the user has viewed more than 3 pages, render a JSON response including an error message, and a status code of 401 unauthorized.

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