Create a model

app/controllers/people_controller.rb

@@ -1,9 +1,5 @@
 class PeopleController < ApplicationController
     def index
-        render json: [
-            { name: 'Joey', age:12 },
-            { name: 'Sarah', age:52 },
-            { name: 'Cthulhu', age: 8000 }
-        ]
+        render json: Person.all
     end
 end

app/models/person.rb

@@ -0,0 +1,9 @@
+class Person
+    def self.all # a static function that's called on the class itself, not an instance
+        [ ## ruby functions return the last line of code, so no need for an explicit 'return' statement
+            { name: 'Joey', age:12 },
+            { name: 'Sarah', age:52 },
+            { name: 'Cthulhu', age: 8000 }
+        ]
+    end
+end