The goal of this Ruby project was to build a complex program which replicated the TfL Oyster card system. Using TDD, the code has been developed with object-oriented design principles in mind.
This project meets the requirements of the following user stories:
In order to use public transport
As a customer
I want money on my card
In order to keep using public transport
As a customer
I want to add money to my card
In order to protect my money
As a customer
I don't want to put too much money on my card
In order to pay for my journey
As a customer
I need my fare deducted from my card
In order to get through the barriers
As a customer
I need to touch in and out
In order to pay for my journey
As a customer
I need to have the minimum amount for a single journey
In order to pay for my journey
As a customer
I need to pay for my journey when it's complete
In order to pay for my journey
As a customer
I need to know where I've travelled from
In order to know where I have been
As a customer
I want to see to all my previous trips
In order to know how far I have travelled
As a customer
I want to know what zone a station is in
In order to be charged correctly
As a customer
I need a penalty charge deducted if I fail to touch in or out
In order to be charged the correct amount
As a customer
I need to have the correct fare calculated
This project was an opportunity to develop skills in the following areas:
- Encapsulation
- Delegation
- Single Responsibility Principle
- Law of Demeter
To create a new Oystercard:
2.3.3 :002 > oystercard = Oystercard.new
=> #<Oystercard:0x007ff6ec170350 @balance=0, @journeylog=#<Journeylog:0x007ff6ec170328 @journey_class=Journey, @history=[]>>
To top-up the Oystercard:
2.3.3 :003 > oystercard.top_up(25)
To touch-in at a station, pass in a new instance of a Station object, using the station name and zone as parameters:
2.3.3 :005 > oystercard.touch_in(Station.new('Richmond', 4))
=> #<Journey:0x007ff6ec149f98 @entry_station=#<Station:0x007ff6ec14a060 @name="Richmond", @zone=4>>
Similarly, to touch out at a station, call the following:
2.3.3 :006 > oystercard.touch_out(Station.new('Brixton', 2))
The journey will be logged on the Oystercard instance as:
#<Oystercard:0x007ff6ec170350 @balance=23, @journeylog=#<Journeylog:0x007ff6ec170328 @journey_class=Journey, @history=[#<Journey:0x007ff6ec149f98 @entry_station=#<Station:0x007ff6ec14a060 @name="Richmond", @zone=4>, @exit_station=#<Station:0x007ff6ec130f48 @name="Brixton", @zone=2>, @fare=2>], @current_journey=nil, @fare=2>>
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