add withdrawl and deposit to FiatBalance and Balance

Gemfile

@@ -8,6 +8,7 @@ ruby "2.7.4"
 gem "pg", "~> 1.1"
 gem "puma", "~> 5.0"
 gem "rails", "~> 6.1.4"
+gem "rails-i18n", "~> 6.0"
 gem "sass-rails", ">= 6"
 gem "turbolinks", "~> 5"
 gem "webpacker", "~> 5.0"

Gemfile.lock

@@ -216,6 +216,9 @@ GEM
       ruby-graphviz (~> 1.2)
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
+    rails-i18n (6.0.0)
+      i18n (>= 0.7, < 2)
+      railties (>= 6.0.0, < 7)
     railties (6.1.4)
       actionpack (= 6.1.4)
       activesupport (= 6.1.4)
@@ -351,6 +354,7 @@ DEPENDENCIES
   pundit
   rails (~> 6.1.4)
   rails-erd
+  rails-i18n (~> 6.0)
   rspec-graphql_matchers (~> 1.3)
   rspec-rails
   rubocop-rails

app/models/balance.rb

@@ -25,5 +25,13 @@ class Balance < ApplicationRecord
   belongs_to :user
   belongs_to :currency
 
-  validates :amount, presence: true
+  validates :amount, presence: true, numericality: { greater_than_or_equal_to: 0 }
+
+  def withdrawal!(value)
+    update!(amount: amount - value)
+  end
+
+  def deposit!(value)
+    update!(amount: amount + value)
+  end
 end

app/models/fiat_balance.rb

@@ -24,7 +24,17 @@ class FiatBalance < ApplicationRecord
 
   monetize :amount_cents
 
+  validates :amount_cents, numericality: { greater_than_or_equal_to: 0 }
+
   def amount_formatted
     amount.format
   end
+
+  def withdrawal!(value)
+    update!(amount_cents: amount_cents - value)
+  end
+
+  def deposit!(value)
+    update!(amount_cents: amount_cents + value)
+  end
 end

config/locales/pt-BR.yml

@@ -32,6 +32,18 @@ pt-BR:
 
       fiat_balance:
         amount_formatted: Quantia
+        amount_cents: Quantia
 
       currency:
-        name: Nome
+        name: Nome
+
+    errors:
+      models:
+        balance:
+          attributes:
+            amount:
+              greater_than_or_equal_to: "saldo insuficiente"
+        fiat_balance:
+          attributes:
+            amount_cents:
+              greater_than_or_equal_to: "saldo insuficiente"

spec/factories/fiat_balances.rb

@@ -23,6 +23,6 @@ FactoryBot.define do
   factory :fiat_balance do
     association :user
     amount_currency { "BRL" }
-    amount_cents { Faker::Number.number(digits: 10) }
+    amount_cents { Faker::Number.number(digits: 4) }
   end
 end

spec/models/admin_user_spec.rb

@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-# == Schema Information
-#
-# Table name: admin_users
-#
-#  id                     :bigint           not null, primary key
-#  email                  :string           default(""), not null
-#  encrypted_password     :string           default(""), not null
-#  remember_created_at    :datetime
-#  reset_password_sent_at :datetime
-#  reset_password_token   :string
-#  created_at             :datetime         not null
-#  updated_at             :datetime         not null
-#
-# Indexes
-#
-#  index_admin_users_on_email                 (email) UNIQUE
-#  index_admin_users_on_reset_password_token  (reset_password_token) UNIQUE
-#
-require "rails_helper"
-
-RSpec.describe(AdminUser, type: :model) do
-  pending "add some examples to (or delete) #{__FILE__}"
-end

spec/models/balance_spec.rb

@@ -32,4 +32,32 @@ RSpec.describe(Balance, type: :model) do
     it { is_expected.to(belong_to(:user)) }
     it { is_expected.to(belong_to(:currency)) }
   end
+
+  describe ".withdrwal!" do
+    context "when value is greater than the balance" do
+      it "raise ActiveRecord::RecordInvalid" do
+        balance = build(:balance, amount: 70.342)
+
+        expect { balance.withdrawal!(80) }.to(
+          raise_error(ActiveRecord::RecordInvalid, "A validação falhou: Quantia saldo insuficiente")
+        )
+      end
+    end
+
+    context "when value is equals to the balance" do
+      it "returns true" do
+        balance = build(:balance, amount: 70.342)
+
+        expect(balance.withdrawal!(70.342)).to(eq(true))
+      end
+    end
+
+    context "when value is smaller than the balance" do
+      it "returns true" do
+        balance = build(:balance, amount: 70.342)
+
+        expect(balance.withdrawal!(20)).to(eq(true))
+      end
+    end
+  end
 end

spec/models/fiat_balance_spec.rb

@@ -25,4 +25,32 @@ RSpec.describe(FiatBalance, type: :model) do
   describe "associations" do
     it { is_expected.to(belong_to(:user)) }
   end
+
+  describe ".withdrwal!" do
+    context "when value is greater than the balance" do
+      it "raise ActiveRecord::RecordInvalid" do
+        balance = build(:fiat_balance, amount_cents: 100_00)
+
+        expect { balance.withdrawal!(100_50) }.to(
+          raise_error(ActiveRecord::RecordInvalid, "A validação falhou: Quantia saldo insuficiente")
+        )
+      end
+    end
+
+    context "when value is equals to the balance" do
+      it "returns true" do
+        balance = build(:fiat_balance, amount_cents: 100_00)
+
+        expect(balance.withdrawal!(100_00)).to(eq(true))
+      end
+    end
+
+    context "when value is smaller than the balance" do
+      it "returns true" do
+        balance = build(:fiat_balance, amount_cents: 100_00)
+
+        expect(balance.withdrawal!(90_00)).to(eq(true))
+      end
+    end
+  end
 end

spec/policies/balance_policy_spec.rb

@@ -2,5 +2,41 @@
 require "rails_helper"
 
 RSpec.describe(BalancePolicy, type: :policy) do
-  pending "add some examples to (or delete) #{__FILE__}"
+  context "when user has balances" do
+    it "return only balances from a user" do
+      create(:balance)
+      create(:balance)
+
+      user = build(:user)
+      balance = create(:balance, user: user)
+
+      balances = BalancePolicy::Scope.new(user, Balance).resolve
+
+      expect(balances).to(eq([balance]))
+    end
+  end
+
+  context "when user has not balances" do
+    it "return empty array" do
+      create(:balance)
+      create(:balance)
+
+      user = build(:user)
+
+      balances = BalancePolicy::Scope.new(user, Balance).resolve
+
+      expect(balances).to(eq([]))
+    end
+  end
+
+  context "when user is nil" do
+    it "return empty array" do
+      create(:balance)
+      create(:balance)
+
+      balances = BalancePolicy::Scope.new(nil, Balance).resolve
+
+      expect(balances).to(eq([]))
+    end
+  end
 end

spec/policies/fiat_balance_policy_spec.rb

@@ -2,5 +2,43 @@
 require "rails_helper"
 
 RSpec.describe(FiatBalancePolicy, type: :policy) do
-  pending "add some examples to (or delete) #{__FILE__}"
+  describe "::Scope" do
+    context "when user has balances" do
+      it "return only balances from a user" do
+        create(:fiat_balance)
+        create(:fiat_balance)
+
+        user = build(:user)
+        balance = create(:fiat_balance, user: user)
+
+        balances = FiatBalancePolicy::Scope.new(user, FiatBalance).resolve
+
+        expect(balances).to(eq([balance]))
+      end
+    end
+
+    context "when user has not balances" do
+      it "return empty array" do
+        create(:fiat_balance)
+        create(:fiat_balance)
+
+        user = build(:user)
+
+        balances = FiatBalancePolicy::Scope.new(user, FiatBalance).resolve
+
+        expect(balances).to(eq([]))
+      end
+    end
+
+    context "when user is nil" do
+      it "return empty array" do
+        create(:fiat_balance)
+        create(:fiat_balance)
+
+        balances = FiatBalancePolicy::Scope.new(nil, FiatBalance).resolve
+
+        expect(balances).to(eq([]))
+      end
+    end
+  end
 end