Created
October 8, 2022 00:25
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A solution to today's lab - Rails 7 Many to many
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# to those of you who got stuck, here are some more hints. Note that there is more than one way to do this! | |
# Also note that I had to debug my solution a little too, I didn't get it the first few times! | |
# | |
# This is not one big file it is a series of key parts of the code | |
# Migrations | |
class CreateStudents < ActiveRecord::Migration[7.0] | |
def change | |
create_table :students do |t| | |
t.string :name | |
t.timestamps | |
end | |
end | |
end | |
class CreateStudents < ActiveRecord::Migration[7.0] | |
def change | |
create_table :students do |t| | |
t.string :name | |
t.timestamps | |
end | |
end | |
end | |
class CreateAdvisorAssignments < ActiveRecord::Migration[7.0] | |
def change | |
create_table :advisor_assignments do |t| | |
t.integer :student | |
t.integer :teacher | |
t.timestamps | |
end | |
end | |
end | |
# seeds.rb | |
10.times do | |
Student.create(name: Faker::Name.name) | |
Teacher.create(name: Faker::Name.name) | |
end | |
10.times do | |
AdvisorAssignment.create(student: Student.all.sample, teacher: Teacher.all.sample) | |
end | |
# models | |
class AdvisorAssignment < ApplicationRecord | |
belongs_to :student | |
belongs_to :teacher | |
end | |
class Student < ApplicationRecord | |
has_many :advisor_assignments | |
has_many :advisors, through: :advisor_assignments, source: :teacher | |
end | |
class Teacher < ApplicationRecord | |
has_many :advisor_assignments | |
has_many :advisees, through: :advisor_assignments, source: :student | |
end |
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