Generates Task model and adds relative unit tests

app/models/activity.rb

@@ -4,6 +4,8 @@ class Activity < ApplicationRecord
   has_one :joined_user_activity
   has_one :user, :through => :joined_user_activity
 
+  has_many :tasks
+
   validates :name, presence: true
   validates :author, presence: true
 end

app/models/task.rb

@@ -0,0 +1,7 @@
+class Task < ApplicationRecord
+  validates :name, presence: true
+  validates :user, presence: true
+
+  belongs_to :activity
+  belongs_to :user
+end

app/models/user.rb

@@ -9,5 +9,7 @@ class User < ApplicationRecord
   has_many :joined_user_activities
   has_many :activities, :through => :joined_user_activities
 
+  has_many :tasks
+
   has_secure_password
 end

config/routes.rb

@@ -3,7 +3,9 @@ Rails.application.routes.draw do
     namespace :v1 do
       resources :users
       resources :tokens, only: %i[create]
-      resources :activities
+      resources :activities do
+        resources :tasks
+      end
     end
   end
 end

db/migrate/20210510133939_create_tasks.rb

@@ -0,0 +1,12 @@
+class CreateTasks < ActiveRecord::Migration[6.1]
+  def change
+    create_table :tasks do |t|
+      t.string :name, index: true
+      t.text :description
+      t.references :activity, null: false
+      t.references :user, null: false
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_04_29_184439) do
+ActiveRecord::Schema.define(version: 2021_05_10_133939) do
 
   create_table "activities", force: :cascade do |t|
     t.string "name", null: false
@@ -32,6 +32,18 @@ ActiveRecord::Schema.define(version: 2021_04_29_184439) do
     t.index ["user_id"], name: "index_joined_user_activities_on_user_id"
   end
 
+  create_table "tasks", force: :cascade do |t|
+    t.string "name"
+    t.text "description"
+    t.integer "activity_id", null: false
+    t.integer "user_id", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["activity_id"], name: "index_tasks_on_activity_id"
+    t.index ["name"], name: "index_tasks_on_name"
+    t.index ["user_id"], name: "index_tasks_on_user_id"
+  end
+
   create_table "users", force: :cascade do |t|
     t.string "email", null: false
     t.string "username", null: false

test/fixtures/tasks.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: Do something
+  description: Description of a task
+  user: one
+  activity: one

test/models/task_test.rb

@@ -0,0 +1,18 @@
+require "test_helper"
+
+class TaskTest < ActiveSupport::TestCase
+  setup do
+    @user = users(:one)
+    @activity = activities(:one)
+  end
+
+  test "task should be valid" do
+    task = Task.new(name: "Write", description: "Write a new line", user_id: @user.id, activity_id: @activity.id)
+    assert task.valid?
+  end
+
+  test "task should not be valid" do
+    task = Task.new(name: "Write", description: "Write a new line")
+    assert_not task.valid?
+  end
+end