index def now return every tasks if requested

app/controllers/api/v1/tasks_controller.rb

@@ -3,7 +3,11 @@ class Api::V1::TasksController < ApplicationController
   before_action :check_login
 
   def index
-    render json: TaskSerializer.new(Activity.find(params[:activity_id]).tasks).serializable_hash.to_json
+    if !params[:activity_id]
+      render json: TaskSerializer.new(Task.all).serializable_hash.to_json
+    else
+      render json: TaskSerializer.new(Activity.find(params[:activity_id]).tasks).serializable_hash.to_json
+    end
   end
 
   def show

config/routes.rb

@@ -6,6 +6,7 @@ Rails.application.routes.draw do
       resources :activities do
         resources :tasks
       end
+      resources :tasks
     end
   end
 end