[ Feat ] Cobranca assinatura premium

app/jobs/billing_job.rb

@@ -0,0 +1,7 @@
+class BillingJob < ApplicationJob
+  queue_as :default
+
+  def perform(subscription)
+    subscription.billings.create(amount: 19.90)
+  end
+end

app/models/billing.rb

@@ -0,0 +1,13 @@
+class Billing < ApplicationRecord
+  belongs_to :subscription
+
+  before_create :set_billing_date
+
+  private
+
+  def set_billing_date
+    return self.billing_date = subscription.start_date if subscription.start_date.day < 29
+
+    self.billing_date = subscription.start_date.next_month.beginning_of_month
+  end
+end

app/models/subscription.rb

@@ -1,7 +1,12 @@
 class Subscription < ApplicationRecord
+  SUBSCRIPTION_AMOUNT = 19.90
   belongs_to :user
+  has_many :billings, dependent: :destroy
+
   enum status: { inactive: 0, active: 10 }
 
+  after_update :create_billing, if: :active? && :saved_change_to_status?
+
   def active!
     self.start_date = Time.zone.now.to_date
     super
@@ -11,4 +16,18 @@ def inactive!
     self.start_date = nil
     super
   end
+
+  private
+
+  def create_billing
+    return if start_date.nil?
+
+    billing_date = if start_date.day < 29
+                     start_date + 1.month
+                   else
+                     start_date.next_month.beginning_of_month + 1.month
+                   end
+
+    billings.create(billing_date:, amount: SUBSCRIPTION_AMOUNT)
+  end
 end

db/migrate/20240214211350_create_billings.rb

@@ -0,0 +1,11 @@
+class CreateBillings < ActiveRecord::Migration[7.1]
+  def change
+    create_table :billings do |t|
+      t.decimal :amount, precision: 8, scale: 2, null: false
+      t.references :subscription, null: false, foreign_key: true
+      t.date :billing_date, null: false
+
+      t.timestamps
+    end
+  end
+end

spec/factories/billings.rb

@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :billing do
+    amount { 19.901 }
+    subscription { nil }
+    billing_date { '2024-02-14' }
+  end
+end

spec/factories/subscriptions.rb

@@ -1,7 +1,7 @@
 FactoryBot.define do
   factory :subscription do
-    user
-    start_date { nil }
-    status { 0 }
+    user { nil }
+    start_date { '2024-02-14' }
+    status { 10 }
   end
 end

spec/jobs/premium_user_receives_monthly_billing_spec.rb

@@ -0,0 +1,16 @@
+require 'rails_helper'
+
+RSpec.describe BillingJob, type: :job do
+  context 'usuário premium' do
+    it 'recebe cobrança de pagamento mensal' do
+      user = User.create!(full_name: 'nome completo', password: 'testes',
+                          email: '[email protected]', citizen_id_number: '13266529073')
+      user.subscription.active!
+      user.subscription.update(start_date: '2024-02-10')
+
+      perform_enqueued_jobs
+
+      expect(Billing.count).to eq 1
+    end
+  end
+end

spec/models/billing_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Billing, type: :model do
+  # pending "add some examples to (or delete) #{__FILE__}"
+end

spec/models/subscription_spec.rb

@@ -3,7 +3,8 @@
 RSpec.describe Subscription, type: :model do
   describe '#active!' do
     it 'atualiza data de início automaticamente' do
-      subscription = create(:subscription, status: :inactive, start_date: nil)
+      user = create(:user, :free)
+      subscription = user.subscription
 
       subscription.active!
 
@@ -14,7 +15,8 @@
 
   describe '#active!' do
     it 'atualiza data de início automaticamente' do
-      subscription = create(:subscription, status: :active, start_date: Time.zone.now)
+      user = create(:user, :free)
+      subscription = user.subscription
 
       subscription.inactive!