njogumike/restaurants_with_alchemy

Phase 3 Code Challenge: Restaurants

For this assignment, we'll be working with a restaurant review domain.

We have three models: Restaurant, Review, and Customer.

For our purposes, a Restaurant has many Reviews, a Customer has many Reviews, and a Review belongs to a Restaurant and to a Customer.

Restaurant - Customer 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

• SQLAlchemy Migrations
• SQLAlchemy Relationships
• Class and Instance Methods
• SQLAlchemy Querying

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Instructions

To get started, run pipenv 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 pytest. You'll need to create your own sample instances so that you can try out your code on your own. Make sure your relationships 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 python debug.py from the command line. This will start a ipdb session with your classes defined. You can test out the methods that you write here. You are also encouraged to use the seeds.py file to create sample data to test your models and relationships.

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.

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What You Already Have

The starter code has migrations and models for the initial Restaurant and Customer models, and seed data for some Restaurants and Customers. The schema currently looks like this:

restaurants Table

Column	Type
name	String
price	Integer

customers Table

Column	Type
first_name	String
last_name	String

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

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Deliverables

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

Remember: SQLAlchemy give your classes access to a lot of methods already! Keep in mind what methods SQLAlchemy 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 Restaurant, and a Review also belongs to an Customer. 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.

After creating the reviews table using a migration, use the seeds.py file to create instances of your Review class so you can test your code.

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

Object Relationship Methods

Use SQLAlchemy query methods where appropriate.

Review

• Review customer()
  • should return the Customer instance for this review
• Review restaurant()
  • should return the Restaurant instance for this review

Restaurant

• Restaurant reviews()
  • returns a collection of all the reviews for the Restaurant
• Restaurant customers()
  • returns a collection of all the customers who reviewed the Restaurant

Customer

• Customer reviews()
  • should return a collection of all the reviews that the Customer has left
• Customer restaurants()
  • should return a collection of all the restaurants that the Customer has reviewed

Use python debug.py and check that these methods work before proceeding. For example, you should be able to call session.query(Customer).first().restaurants and see a list of the restaurants for the first customer in the database based on your seed data; and session.query(Review).first().customer should return the customer for the first review in the database.

Aggregate and Relationship Methods

Customer

• Customer full_name()
  • returns the full name of the customer, with the first name and the last name concatenated, Western style.
• Customer favorite_restaurant()
  • returns the restaurant instance that has the highest star rating from this customer
• Customer add_review(restaurant, rating)
  • takes a restaurant (an instance of the Restaurant class) and a rating
  • creates a new review for the restaurant with the given restaurant_id
• Customer delete_reviews(restaurant)
  • takes a restaurant (an instance of the Restaurant class) and
  • removes all their reviews for this restaurant
  • you will have to delete rows from the reviews table to get this to work!

Review

• Review full_review()
  • should return a string formatted as follows:

Review for {insert restaurant name} by {insert customer's full name}: {insert review star_rating} stars.

Restaurant

• Restaurant fanciest(), this method should be a class method
  • returns one restaurant instance for the restaurant that has the highest price
• Restaurant all_reviews()
  • should return an list of strings with all the reviews for this restaurant formatted as follows:

[
  "Review for {insert restaurant name} by {insert customer's full name}: {insert review star_rating} stars.",
  "Review for {insert restaurant name} by {insert customer's full name}: {insert review star_rating} stars.",
]