add slack notifications

app/models/buy_crypto_order.rb

@@ -25,6 +25,7 @@
 #
 class BuyCryptoOrder < ApplicationRecord
   include Processable
+  include Notifiable
 
   belongs_to :user
   belongs_to :currency
@@ -33,4 +34,14 @@ class BuyCryptoOrder < ApplicationRecord
 
   validates :paid_amount_cents, presence: true, numericality: { greater_than: 0 }
   validates :received_amount, presence: true, if: :completed?
+
+  private
+
+  def notification_message
+    "
+    💸 New buy crypto order! 💸 \n
+    user: #{user.email} \n
+    amount: #{paid_amount.format}
+    "
+  end
 end

app/models/concerns/notifiable.rb

@@ -0,0 +1,18 @@
+
+
+# frozen_string_literal: true
+module Notifiable
+  extend ActiveSupport::Concern
+
+  included do
+    after_commit on: :create do
+      SlackNotifier.ping(notification_message)
+    end
+  end
+
+  private
+
+  def notification_message
+    raise NotImplementedError, "method should be implemented"
+  end
+end

app/models/sell_crypto_order.rb

@@ -25,6 +25,7 @@
 #
 class SellCryptoOrder < ApplicationRecord
   include Processable
+  include Notifiable
 
   belongs_to :user
   belongs_to :currency
@@ -33,4 +34,14 @@ class SellCryptoOrder < ApplicationRecord
 
   validates :paid_amount, presence: true, numericality: { greater_than: 0 }
   validates :received_amount_cents, presence: true, if: :completed?
+
+  private
+
+  def notification_message
+    "
+    💸 New sell crypto order! 💸\n
+    user: #{user.email} \n
+    amount: #{paid_amount} #{currency.name}
+    "
+  end
 end

app/models/user.rb

@@ -21,6 +21,8 @@
 #  index_users_on_reset_password_token  (reset_password_token) UNIQUE
 #
 class User < ApplicationRecord
+  include Notifiable
+
   devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :validatable
 
@@ -43,4 +45,10 @@ class User < ApplicationRecord
   def create_balances
     CreateUserBalances.new(self).call
   end
+
+  private
+
+  def notification_message
+    "🎉 New user: #{email} 🎉"
+  end
 end

app/services/slack_notifier.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module SlackNotifier
+  def self.ping(message)
+    return if ENV["SLACK_WEBHOOK_URL"].blank?
+
+    Slack::Notifier.new(ENV["SLACK_WEBHOOK_URL"]).ping(message)
+  end
+end