Add basic functionality

db/migrate/20230924015422_create_people.rb

@@ -2,6 +2,8 @@ class CreatePeople < ActiveRecord::Migration[7.0]
   def change
     create_table :people do |t|
       t.string :name, null: false
+      t.date :birth_day, null: false
+      t.references :birth_country, null: false, foreign_key: { to_table: :countries }
 
       t.timestamps
     end

db/migrate/20230924015803_create_admissions.rb

@@ -3,6 +3,8 @@ class CreateAdmissions < ActiveRecord::Migration[7.0]
     create_table :admissions do |t|
       t.references :country, null: false, foreign_key: true
       t.references :person, null: false, foreign_key: true
+      t.references :previous, null: true, foreign_key: { to_table: :admissions }
+
       t.date :arrived_on, null: false
 
       t.timestamps

db/schema.rb

@@ -14,11 +14,13 @@ ActiveRecord::Schema[7.0].define(version: 2023_09_24_015803) do
   create_table "admissions", force: :cascade do |t|
     t.integer "country_id", null: false
     t.integer "person_id", null: false
+    t.integer "previous_id"
     t.date "arrived_on", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["country_id"], name: "index_admissions_on_country_id"
     t.index ["person_id"], name: "index_admissions_on_person_id"
+    t.index ["previous_id"], name: "index_admissions_on_previous_id"
   end
 
   create_table "countries", force: :cascade do |t|
@@ -34,10 +36,15 @@ ActiveRecord::Schema[7.0].define(version: 2023_09_24_015803) do
 
   create_table "people", force: :cascade do |t|
     t.string "name", null: false
+    t.date "birth_day", null: false
+    t.integer "birth_country_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["birth_country_id"], name: "index_people_on_birth_country_id"
   end
 
+  add_foreign_key "admissions", "admissions", column: "previous_id"
   add_foreign_key "admissions", "countries"
   add_foreign_key "admissions", "people"
+  add_foreign_key "people", "countries", column: "birth_country_id"
 end