lithnotep / ruby_nested_iteration

Ruby Nested Iteration Practice

Starting with the CourseTest, then moving on to the SchoolTest, unskip tests as you come to them and make each of those tests pass.

As you work through this exercise, the classes will eventually respond to the interaction pattern below:

Student

A student is assigned a house through an attr_accessor - student.house = :house_name.

pry(main)> require './lib/student'
#=> true

pry(main)> student = Student.new('Hermione')
#=> #<Student:0x007fa621d0cd38 @house=nil, @name="Hermione">

pry(main)> student.name
#=> "Hermione"

pry(main)> student.house
#=> nil

pry(main)> student.house = :gryffindor

pry(main)> student.house
#=> :gryffindor

Course

The houses_represented method should return an unique list of houses for the students enrolled in that course.

pry(main)> require './lib/student'
#=> true

pry(main)> require './lib/course'
#=> true

pry(main)> student1 = Student.new('Malfoy')    
#=> #<Student:0x007ffc8333f130 @house=nil, @name="Malfoy">

pry(main)> student1.house = :slytherin    

pry(main)> student2 = Student.new('Ron')    
#=> #<Student:0x007ffc83b00180 @house=nil, @name="Ron">

pry(main)> student2.house = :gryffindor    

pry(main)> student3 = Student.new('Harry')    
#=> #<Student:0x007ffc82a50268 @house=nil, @name="Harry">

pry(main)> student3.house = :gryffindor    

pry(main)> course = Course.new('Potions', 'Severus Snape')    
#=> #<Course:0x007ffc82a807d8 @name="Potions", @professor="Severus Snape", @students=[]>

pry(main)> course.name
#=> "Potions"

pry(main)> course.professor
#=> "Severus Snape"

pry(main)> course.students
#=> []

pry(main)> course.add_student(student1)    

pry(main)> course.add_student(student2)    

pry(main)> course.add_student(student3)    

pry(main)> course.students
#=> [#<Student:0x007ffc8333f130 @house=:slytherin, @name="Malfoy">,
     #<Student:0x007ffc83b00180 @house=:gryffindor, @name="Ron">,
     #<Student:0x007ffc82a50268 @house=:gryffindor, @name="Harry">]

pry(main)> course.houses_represented
#=> [:slytherin, :gryffindor]

School

A school is created with a name and and list of houses. When sorting a student, the school randomly assigns a house to that student. The sort_students method should assign a house to every student enrolled in courses at that school.

pry(main)> require './lib/student'
#=> true

pry(main)> require './lib/course'
#=> true

pry(main)> require './lib/school'
#=> true

pry(main)> @student1 = Student.new('Malfoy')
#=> #<Student:0x007fb7a42a4fc8 @house=nil, @name="Malfoy">

pry(main)> @student2 = Student.new('Ron')    
#=> #<Student:0x007fb7a4bc7e20 @house=nil, @name="Ron">

pry(main)> @student3 = Student.new('Harry')    
#=> #<Student:0x007fb7a4be6848 @house=nil, @name="Harry">

pry(main)> @student4 = Student.new('Hermione')    
#=> #<Student:0x007fb7a4c04ed8 @house=nil, @name="Hermione">

pry(main)> @student5 = Student.new('Luna')    
#=> #<Student:0x007fb7a50d8ea0 @house=nil, @name="Luna">

pry(main)> @student6 = Student.new('Penelope')    
#=> #<Student:0x007fb7a4c24940 @house=nil, @name="Penelope">

pry(main)> @student7 = Student.new('Ernie')    
#=> #<Student:0x007fb7a42b41f8 @house=nil, @name="Ernie">

pry(main)> @course1 = Course.new('Potions', 'Severus Snape')    
#=> #<Course:0x007fb7a4a2ea00 @name="Potions", @professor="Severus Snape", @students=[]>

pry(main)> @course1.add_student(@student1)    

pry(main)> @course1.add_student(@student2)    

pry(main)> @course1.add_student(@student3)    

pry(main)> @course2 = Course.new('Defense Against the Dark Arts', 'Remus Lupin')    
#=> #<Course:0x007fb7a4c8d5a8 @name="Defense Against the Dark Arts", @professor="Remus Lupin", @students=[]>

pry(main)> @course2.add_student(@student3)    

pry(main)> @course2.add_student(@student4)    

pry(main)> @course2.add_student(@student5)    

pry(main)> @course3 = Course.new('Herbology', 'Pomona Sprout')    
#=> #<Course:0x007fb7a4cdc9f0 @name="Herbology", @professor="Pomona Sprout", @students=[]>

pry(main)> @course3.add_student(@student5)    

pry(main)> @course3.add_student(@student6)    

pry(main)> @course3.add_student(@student7)    

pry(main)> @school = School.new('Hogwarts', [:gryffindor, :slytherin, :ravenclaw, :hufflepuff])    
#=> #<School:0x007fb7a5ae5268 @courses=[], @houses=[:gryffindor, :slytherin, :ravenclaw, :hufflepuff], @name="Hogwarts">

pry(main)> @school.name
#=> "Hogwarts"

pry(main)> @school.houses
#=> [:gryffindor, :slytherin, :ravenclaw, :hufflepuff]

pry(main)> @school.courses
#=> []

pry(main)> @school.add_course(@course1)

pry(main)> @school.add_course(@course2)

pry(main)> @school.add_course(@course3)

pry(main)> @school.courses
#=> [#<Course:0x007fb7a4a2ea00...>, #<Course:0x007fb7a4c8d5a8...>,#<Course:0x007fb7a4cdc9f0...>]

pry(main)> @school.sort(@student1)

pry(main)> @student1.house
#=> will be one of the 4 houses

pry(main)> @school.sort_students

pry(main)> @student1.house
#=> will be one of the 4 houses

pry(main)> @student2.house
#=> will be one of the 4 houses

pry(main)> @student3.house
#=> will be one of the 4 houses

...

# We are now resetting the students houses, for the last method.
pry(main)> @student1.house = :slytherin    

pry(main)> @student2.house = :gryffindor    

pry(main)> @student3.house = :gryffindor    

pry(main)> @student4.house = :gryffindor    

pry(main)> @student5.house = :ravenclaw    

pry(main)> @student6.house = :ravenclaw    

pry(main)> @student7.house = :hufflepuff    

pry(main)> @school.students_by_house
#=> {:slytherin=>[#<Student:0x007fb7a42a4fc8...>],
#    :gryffindor=>[#<Student:0x007fb7a4bc7e20...>,
#                  #<Student:0x007fb7a4be6848...>,
#                  #<Student:0x007fb7a4c04ed8...>],
#    :ravenclaw=>[#<Student:0x007fb7a50d8ea0...>,
#                 #<Student:0x007fb7a4c24940...>],
#    :hufflepuff=>[#<Student:0x007fb7a42b41f8...>]}