For this assignment, we'll be working with a freebie domain.
As developers, when you attend hackathons, you'll realize they hand out a lot of free items (informally called freebies, or swag)! Let's make an app for developers that keeps track of all the freebies they obtain.
We have three models: Company
, Dev
, and Freebie
For our purposes, a Company
has many Freebie
s, a Dev
has many Freebie
s,
and a Freebie
belongs to a Dev
and to a Company
.
Company
- Dev
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.
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 mock code challenge does not have tests. You cannot run
pytest
and you cannot run learn test
. 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 an ipdb
session
with your classes defined. You can test out the methods that you write here.
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.
Write the following functionality in the classes in the files provided. Feel free to build out any helper methods if needed.
-
A
Company
has a name that's a string & founding year that is an integer. -
A
Dev
has a name that's a string. -
A
Freebie
belongs to aDev
, and aFreebie
also belongs to aCompany
. -
The
freebies
model should also have:- An
item_name
column that stores a string. - A
value
column that stores an integer.
- An
After you've set up your freebies
, work on building out the following
deliverables.
Freebie.dev
returns theDev
instance for this Freebie.Freebie.company
returns theCompany
instance for this Freebie.
Company.freebies
returns a collection of all the freebies for the Company.Company.devs
returns a collection of all the devs who collected freebies from the company.
Dev.freebies
returns a collection of all the freebies that the Dev has collected.Dev.companies
returns a collection of all the companies that the Dev has collected freebies from.
Use python debug.py
and check that these methods work before proceeding.
Freebie.print_details()
should return a string formatted as follows:{dev name} owns a {freebie item_name} from {company name}
.
Company.give_freebie(dev, item_name, value)
takes adev
(an instance of theDev
class), anitem_name
(string), and avalue
as arguments, and creates a newFreebie
instance associated with this company and the given dev.- Class method
Company.oldest_company()
returns theCompany
instance with the earliest founding year.
Dev.received_one(item_name)
accepts anitem_name
(string) and returnsTrue
if any of the freebies associated with the dev has thatitem_name
, otherwise returnsFalse
.Dev.give_away(dev, freebie)
accepts aDev
instance and aFreebie
instance, changes the freebie's dev to be the given dev; your code should only make the change if the freebie belongs to the dev who's giving it away