Create a show route

app/controllers/people_controller.rb

@@ -2,4 +2,8 @@ class PeopleController < ApplicationController
     def index
         render json: Person.all
     end
+
+    def show
+        render json: Person.find(params[:id])
+    end
 end

app/models/person.rb

@@ -12,4 +12,9 @@ class Person
         results = DB.exec("SELECT * FROM people;")
         return results.map { |result| Person.new(result) }
     end
+
+    def self.find(id)
+        results = DB.exec("SELECT * FROM people WHERE id=#{id};")
+        return Person.new(results.first)
+    end
 end

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
   get '/people', to: 'people#index'
+  get '/people/:id', to: 'people#show'
 end