Orders analysis exercise

In this exercise you will learn:

• How to read data from CSV files
• How to structure classes to store input data
• How to create associations between classes

Download the project

Download the project here.

Tasks

This exercise has 3 Ruby files and 2 CSV files. The idea is to load the data from the CSV files and "glue" them together in Ruby classes.

The file order_analysis.rb is supposed to be executed. It already contains an example how to read data from one of the CSV files. Before you continue, execute this script now and have a look at the output. Also try to follow what happens in the existing code.

Have you executed the script and analysed the output and the script?

If yes, please continue... 😉

From there we'd like to implement following things:

• Implement a Customer class (see customer.rb) where we "store" data from customers.csv.
• Implement an Order class (see order.rb) where we "store" data from orders.csv.
• In order_analysis.rb, find and attach all loaded Order objects to the corresponding Customer objects. At the end each Customer object should have a list of Orders.
• Create a report that prints all customers and their orders in a fancy way (see example below).
• Make a report that list the customers ranked by their expenses (see example below).

Need Guidance?

If you feel lost and require some sort of "Guidance", there's a document that helps you go through the exercise step by step. Use it on your own responsibility.

To the Guidance Document

Possible Outputs

Following are examples of how the described outputs could look like. Feel free to "design" them as you like.

Report of customers with order details

$ ruby order_analysis.rb
Customer 1: Peter Parker (Paris)
 - Shawl €22.52
 - Jeans €71.52
 - Robe €42.95
Total: €136.99

Customer 2: Steven Miller (Bejing)
 - Tracksuit €94.91
 - Robe €79.06
Total: €173.97

Customer 3: Milo Jehle (Cape Town)
 - T-Shirt €48.95
 - Boxers €50.10
 - Swimwear €54.80
 - Bikini €40.35
 - Sarong €26.16
 - Fleece €20.31
Total: €240.67
# ...

Report of Top-Customers

$ ruby order_analysis.rb top
Customer 6: Susan Mckenna (Lagos) (€555.61)
Customer 8: Ira Whitsett (Tokyo) (€481.81)
Customer 18: Julienne Charleston (Buenos Aires) (€432.19)
Customer 19: Edison Calixte (London) (€386.27)
Customer 20: Jenine Goldner (Zurich) (€381.72)
Customer 12: Georgette Lemasters (Berlin) (€363.59)
Customer 7: Catarina Keating (Madrid) (€352.9)
Customer 9: Kieth Acker (Amsterdam) (€335.72)
Customer 17: Dayna Esteves (Kabul) (€319.3)
Customer 14: Vashti Fraizer (Singapore) (€241.6)
Customer 3: Milo Jehle (Cape Town) (€240.67)
Customer 15: Izetta Agostini (Stockholm) (€229.88)
Customer 5: Darrick Flakes (Cairo) (€177.68)
Customer 2: Steven Miller (Bejing) (€173.97)
Customer 13: Shae Gildersleeve (Mumbai) (€165.36)
Customer 10: Lula Crutchfield (São Paolo) (€147.23)
Customer 1: Peter Parker (Paris) (€136.99)
Customer 16: Jonie Natividad (Helsinki) (€106.37)
Customer 4: Daron Treadaway (Los Angeles) (€79.79)
Customer 11: Syble Gehringer (Sydney) (€42.42)
Customer 21: Luanne Duchene (Jakarta) (€0)
Customer 22: Jeannine Cutting (Nairobi) (€0)