Assignment 2 - Knife Opinion
Knife Opinion is a single-page web app that allows users to post their opinions about knives online, and reply to other people's opinions.
Users can post new opinions, which include some review text and, optionally, their name. Opinions submitted without a name are labelled "anonymous" and should have distinct formatting.
Users can additionally "like" other opinion posts.
A simple database with one table is suﬃcient to model the database requirements for this assignment, however you may if you wish extend and/or normalize this database.
The database has the following structure:
KnifePost ( id, name, text, post_date, likes, reply_to )
Each record in the KnifePost table represents a single opinion post.
The post_date field should be a MySQL TIMESTAMP field, and contains the date and time that the post was created. You may achieve this using the DEFAULT CURRENT_TIMESTAMP declaration in your CREATE TABLE statement.
The likes field is an integer value indicating how many people have "liked" the opinion.
The reply_to field is a nullable foreign key, which indicates which post, if any, each post is a reply to. A NULL reply_to indicates that the post is not a reply.
The assignment tasks are closely associated with the lab work of topics 7 to 10. Code and examples from lectures and labs should be a useful guide throughout this assignment. The assignment requires a number of files and a report to be produced. The report should respond to written tasks that are included below
Create the above database using your existing SQL skills. You will need at least eight opinions about knives. At least three posts should be replies.
At least one of the posts should be written by somebody called user30339827.
Invent or discover your own data. Cite data sources appropriately in your report, or alternatively include a source field in your database.
Submit your SQL file as part of your assignment.
Mark up the complete data using JSON and save it as a .json file. Check that the file is valid JSON and report the method used to validate.
Submit this file as part of your assignment.
Create a RESTful JSON API using PHP, implementing at least the following functionality:
List all top-level opinion posts (GET)
Should include id, name, text, likes for posts with a NULL reply_to value.
Use an optional querystring/GET parameter to allow sorting by post_date and likes.
Retrieve all details for a particular post (GET)
Create a new post (POST)
Increment the likes value for an opinion (POST)
Decrement the likes value for an opinion (POST)
Note that it is ok to unlike a post that you never liked - this may result in the likes field being negative.
The Like and Unlike methods are not strictly following RESTful practices, as they are not implemented by transferring state. You may choose to use the PUT method instead.
Follow HATEOAS (Hypermedia as the Engine of Application State) practices. Include a note in your report about how you have followed HATEOAS.
Under Apache, this step will require configuring a .htaccess file to allow using clean URLs (without a .php extension)
Display a global timeline of all top level knife opinion posts. Sort the list by date, with the most recent first.
Allow the user to submit a new top-level post, which will be displayed immediately in the review list.
Display the details of an individual post when clicked, including all direct replies.
Allow the user to reply to a top-level post. The reply should be displayed immediately.
Allow the user to "like" a post by clicking on a link or button.
Periodically (every 5 seconds), update the page with new posts or replies and updated "like" counts. This should not remove any text currently being entered in any forms.
The last requirement can be tested by opening your site in multiple browser tabs at the same time
Bonus tasks (Completely optional!)
These tasks are 100% optional, and you can receive full marks without attempting or completing them. They are intended to be a challenge if you are interested in such things, and the marks available do not reflect the significant research and eﬀort required to implement them correctly.
Bonus task one: WebSockets
Instead of polling every 5 seconds, use WebSockets to notify browsers when the content they are viewing has changed.
Implement your WebSocket server using either Python or Node.js. You may use an existing WebSocket library.
Bonus task two: Token-based authentication
Implement optional signup/login, also using AJAX techniques, which allows deleting posts and remembering likes.
Use JWT token-based authentication, rather than cookies / PHP sessions.
Bonus task three: GraphQL in Python
Using Python and the Graphene and SQLAlchemy libraries, implement a new API using GraphQL.
Create a variant of your front-end that uses your new GraphQL API instead of REST.