Adds def create and test units, must fix a test

app/controllers/api/v1/tasks_controller.rb

     render json: TaskSerializer.new(@task).serializable_hash.to_json
   end
 
+  def create
+    task = current_user.tasks.build(task_params)
+    task.activity_id = params[:activity_id]
+    if task.save
+      render json: TaskSerializer.new(task).serializable_hash.to_json,
+      status: :created
+    else
+      render json: { errors: activity.errors }, status: :unprocessable_entity
+    end
+  end
+
   private
 
   def task_params
-    params.require(:task).permit(:name, :description, :user_id, :activity_id)
+    params.require(:task).permit(:name, :description, :activity_id)
   end
 
   def set_task

db/migrate/20210510133939_create_tasks.rb

 class CreateTasks < ActiveRecord::Migration[6.1]
   def change
     create_table :tasks do |t|
-      t.string :name, index: true
+      t.string :name, null: false
+      t.index :name
       t.text :description
       t.references :activity, null: false
       t.references :user, null: false

db/schema.rb

   end
 
   create_table "tasks", force: :cascade do |t|
-    t.string "name"
+    t.string "name", null: false
     t.text "description"
     t.integer "activity_id", null: false
     t.integer "user_id", null: false

db/seeds.rb

   end
 end
 
-10.times do |i|
+30.times do |i|
   task = Task.create(
     name: Faker::Fantasy::Tolkien.character,
     description: Faker::Fantasy::Tolkien.poem,

test/controllers/api/v1/activities_controller_test.rb

   test "should create activity" do
     assert_difference("Activity.count") do
       post api_v1_activities_url,
-      params: { activity: { name: @activity.name, client: @activity.client, description: @activity.description, author_id: @user }},
+      params: { activity: { name: @activity.name, client: @activity.client, description: @activity.description, author_id: @user } },
       headers: { Authorization: JsonWebToken.encode(user_id: @activity.author_id) },
       as: :json
     end

test/controllers/api/v1/tasks_controller_test.rb

     as: :json
     assert_response :forbidden
   end
+
+  # CREATE
+  test "should create task" do
+    assert_difference("Task.count") do
+      post api_v1_activity_tasks_url(@activity),
+      params: { task: { name: @task.name, description: @task.description, user_id: @user, activity_id: @activity } },
+      headers: { Authorization: JsonWebToken.encode(user_id: @user.id) },
+      as: :json
+    end
+    assert_response :created
+  end
+
+  test "should forbid create task - not logged in" do
+    assert_no_difference("Task.count") do
+      post api_v1_activity_tasks_url(@activity),
+      params: { task: { name: @task.name, description: @task.description, user_id: @user, activity_id: @activity } },
+      as: :json
+    end
+    assert_response :forbidden
+  end
+
+  test "should forbid create task - missing user or activity id" do
+    assert_no_difference("Task.count") do
+      post api_v1_activity_tasks_url(@activity),
+      params: { task: { name: @task.name, description: @task.description } },
+      headers: { Authorization: JsonWebToken.encode(user_id: @user.id) },
+      as: :json
+    end
+    assert_response :forbidden
+  end
 end