noahkimtai / active_products_reviews

Phase 3 Code Challenge: Product Reviews

For this assignment, we'll be working with an e-commerce domain. We'll be focusing on the product reviews.

We have three models: User, Review, and Product.

For our purposes, a Product has many Users, a User has many Productss, and a Review belongs to a User and to a Product.

Product - User is a many to many relationship.

Note: You should draw your domain on paper or on a whiteboard before you start coding. Remember to identify a single source of truth for your data.

Topics

• Active Record Migrations
• Active Record Associations
• Class and Instance Methods
• Active Record Querying

Instructions

To get started, run bundle install while inside of this directory.

Build out all of the methods listed in the deliverables. The methods are listed in a suggested order, but you can feel free to tackle the ones you think are easiest. Be careful: some of the later methods rely on earlier ones.

Remember! This code challenge does not have tests. You cannot run rspec and you cannot run learn. You'll need to create your own sample instances so that you can try out your code on your own. Make sure your associations and methods work in the console before submitting.

We've provided you with a tool that you can use to test your code. To use it, run rake console from the command line. This will start a pry session with your classes defined. You can test out the methods that you write here. You are also encouraged to use the seeds.rb file to create sample data to test your models and associations.

Writing error-free code is more important than completing all of the deliverables listed - prioritize writing methods that work over writing more methods that don't work. You should test your code in the console as you write.

Similarly, messy code that works is better than clean code that doesn't. First, prioritize getting things working. Then, if there is time at the end, refactor your code to adhere to best practices.

Before you submit! Save and run your code to verify that it works as you expect. If you have any methods that are not working yet, feel free to leave comments describing your progress.

What You Already Have

The starter code has migrations and models for the initial User and Product models, and seed data for some Users and Products. The schema currently looks like this:

users Table

Column	Type
name	String

products Table

Column	Type
name	String
price	Integer

You will need to create the migration for the reviews table using the attributes specified in the deliverables below.

Deliverables

Write the following methods in the classes in the files provided. Feel free to build out any helper methods if needed.

Deliverables use the notation # for instance methods, and . for class methods.

Remember: Active Record give your classes access to a lot of methods already! Keep in mind what methods Active Record gives you access to on each of your classes when you're approaching the deliverables below.

Migrations

Before working on the rest of the deliverables, you will need to create a migration for the reviews table.

• A Review belongs to a Product, and a Review also belongs to a User. In your migration, create any columns your reviews table will need to establish these relationships.
• The reviews table should also have:
  • A star_rating column that stores an integer.
  • A comment column that stores a string.

After creating and running your migration, create your Review class, and use the seeds.rb file to create Review instances so you can test your code.

Once you've set up your reviews table, work on building out the following deliverables.

Object Association Methods

Use Active Record association macros and Active Record query methods where appropriate (i.e. has_many, has_many through, and belongs_to).

Review

• Review#user
  • returns the User instance for this Review
• Review#product
  • returns the Product instance for this Review

Product

• Product#reviews
  • returns a collection of all the Reviews for the Product
• Product#users
  • returns a collection of all the Users who reviewed the Product

User

• User#reviews
  • returns a collection of all the Reviews that the User has given
• User#products
  • returns a collection of all the Products that the User has reviewed

Use rake console and check that these methods work before proceeding. For example, you should be able to call User.first.products and see a list of the products for the first user in the database based on your seed data; and Review.first.user should return the user for the first review in the database.

Aggregate and Association Methods

Review

• Review#print_review
  • should puts to the terminal a string formatted as follows: Review for {insert product name} by {insert user name}: {insert review star_rating}. {insert review comment}

Product

• Product#leave_review(user, star_rating, comment)
  • takes a User (an instance of the User class), a star_rating (integer), and a comment (string) as arguments, and creates a new Review in the database associated with this Product and the User
• Product#print_all_reviews
  • should puts to the terminal a string representing each review for this product
  • each review should be formatted as follows: Review for {insert product name} by {insert user name}: {insert review star_rating}. {insert review comment}
• Product#average_rating
  • returns a float representing the average star rating for all reviews for this product

User

• User#favorite_product
  • returns the product instance that has the highest star rating from this user
• User#remove_reviews(product)
  • takes a Product (an instance of the Product class) and removes all of this user's reviews for that product
  • you will have to delete any rows from the reviews table associated with this user and the product