Added duration field to Task migration, timestamps fields are now sent with def show in Task controller

app/controllers/api/v1/tasks_controller.rb

   private
 
   def task_params
-    params.require(:task).permit(:name, :description, :activity_id)
+    params.require(:task).permit(:name, :description, :duration, :activity_id, :created_at, :updated_at)
   end
 
   def set_task

app/serializers/task_serializer.rb

 class TaskSerializer
   include JSONAPI::Serializer
-  attributes :name, :description, :user_id, :activity_id
+  attributes :name, :description, :duration, :user_id, :activity_id, :created_at, :updated_at
 
   cache_options store: Rails.cache, namespace: 'jsonapi-serializer', expires_in: 1.hour
 end

db/migrate/20210510133939_create_tasks.rb

       t.string :name, null: false
       t.index :name
       t.text :description
+      t.integer :duration
       t.references :activity, null: false
       t.references :user, null: false
 

db/schema.rb

   create_table "tasks", force: :cascade do |t|
     t.string "name", null: false
     t.text "description"
+    t.integer "duration"
     t.integer "activity_id", null: false
     t.integer "user_id", null: false
     t.datetime "created_at", precision: 6, null: false

db/seeds.rb

   task = Task.create(
     name: Faker::Fantasy::Tolkien.character,
     description: Faker::Fantasy::Tolkien.poem,
+    duration: rand(1..120),
     user_id: User.all.sample.id,
     activity_id: Activity.all.sample.id
   )

test/fixtures/tasks.yml

 one:
   name: Do something
   description: Description of a task
+  duration: 60
   user: one
   activity: one

test/test_helper.rb

   fixtures :all
 
   # Add more helper methods to be used by all tests here...
-end
+end