Starting with the course_spec, then moving on to the school_spec, unskip tests as you come to them and make each of those tests pass.
Some rules:
- do not create any additional instance variables,
- do not change anything about the tests (except for unskipping them),
- do not create any helper methods.
As you work through this exercise, the classes will eventually respond to the interaction pattern below:
A student is assigned a group through an attr_accessor - student.group = :group_name.
pry(main)> require './lib/student'
#=> true
pry(main)> student = Student.new('Hermione')
#=> #<Student:0x007fa621d0cd38 @group=nil, @name="Hermione">
pry(main)> student.name
#=> "Hermione"
pry(main)> student.group
#=> nil
pry(main)> student.group = :lions
pry(main)> student.group
#=> :lionsThe student_groups method should return an unique list of groups for the students in that course.
pry(main)> require './lib/student'
#=> true
pry(main)> require './lib/course'
#=> true
pry(main)> student1 = Student.new('Malfoy')
#=> #<Student:0x007ffc8333f130 @group=nil, @name="Malfoy">
pry(main)> student1.group = :snakes
pry(main)> student2 = Student.new('Ron')
#=> #<Student:0x007ffc83b00180 @group=nil, @name="Ron">
pry(main)> student2.group = :lions
pry(main)> student3 = Student.new('Harry')
#=> #<Student:0x007ffc82a50268 @group=nil, @name="Harry">
pry(main)> student3.group = :lions
pry(main)> course = Course.new('Chemistry', 'Severus Snape')
#=> #<Course:0x007ffc82a807d8 @name="Chemistry", @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 @group=:slytherin, @name="Malfoy">,
#<Student:0x007ffc83b00180 @group=:gryffindor, @name="Ron">,
#<Student:0x007ffc82a50268 @group=:gryffindor, @name="Harry">]
pry(main)> course.groups
#=> [:snakes, :lions]A school is created with a name and and list of study groups. At this school, students are enrolled in courses, and then assigned to their study groups. The group_students method should assign a group to every student enrolled in a course or 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 @group=nil, @name="Malfoy">
pry(main)> @student2 = Student.new('Ron')
#=> #<Student:0x007fb7a4bc7e20 @group=nil, @name="Ron">
pry(main)> @student3 = Student.new('Harry')
#=> #<Student:0x007fb7a4be6848 @group=nil, @name="Harry">
pry(main)> @student4 = Student.new('Hermione')
#=> #<Student:0x007fb7a4c04ed8 @group=nil, @name="Hermione">
pry(main)> @student5 = Student.new('Luna')
#=> #<Student:0x007fb7a50d8ea0 @group=nil, @name="Luna">
pry(main)> @student6 = Student.new('Penelope')
#=> #<Student:0x007fb7a4c24940 @group=nil, @name="Penelope">
pry(main)> @student7 = Student.new('Ernie')
#=> #<Student:0x007fb7a42b41f8 @group=nil, @name="Ernie">
pry(main)> @course1 = Course.new('Chemistry', 'Severus Snape')
#=> #<Course:0x007fb7a4a2ea00 @name="Chemistry", @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('Criminal Psychology - Practical Applications', 'Remus Lupin')
#=> #<Course:0x007fb7a4c8d5a8 @name="Criminal Psychology - Practical Applications", @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('Gardening', 'Pomona Sprout')
#=> #<Course:0x007fb7a4cdc9f0 @name="Gardening", @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('Pigfreckles', [:lions, :snakes, :eagles, :badgers])
#=> #<School:0x007fb7a5ae5268 @courses=[], @groups=[:lions, :snakes, :eagles, :badgers], @name="Pigfreckles">
pry(main)> @school.name
#=> "Pigfreckles"
pry(main)> @school.groups
#=> [:lions, :snakes, :eagles, :badgers]
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.assign_to_group(@student1)
pry(main)> @student1.group
#=> will be one of the 4 groups
pry(main)> @school.group_all_students
pry(main)> @student1.group
#=> will be one of the 4 groups
pry(main)> @student2.group
#=> will be one of the 4 groups
pry(main)> @student3.group
#=> will be one of the 4 groups
...
# We are now resetting the students groups, for the last method.
pry(main)> @student1.group = :snakes
pry(main)> @student2.group = :lions
pry(main)> @student3.group = :lions
pry(main)> @student4.group = :lions
pry(main)> @student5.group = :eagles
pry(main)> @student6.group = :eagles
pry(main)> @student7.group = :badgers
pry(main)> @school.students_by_group
#=> {:snakes=>[#<Student:0x007fb7a42a4fc8...>],
# :lions=>[#<Student:0x007fb7a4bc7e20...>,
# #<Student:0x007fb7a4be6848...>,
# #<Student:0x007fb7a4c04ed8...>],
# :eagles=>[#<Student:0x007fb7a50d8ea0...>,
# #<Student:0x007fb7a4c24940...>],
# :badgers=>[#<Student:0x007fb7a42b41f8...>]}
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