feat(dossier): add dossier transfer models

app/models/dossier_transfer.rb

@@ -0,0 +1,53 @@
+# == Schema Information
+#
+# Table name: dossier_transfers
+#
+#  id         :bigint           not null, primary key
+#  email      :string           not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+class DossierTransfer < ApplicationRecord
+  has_many :dossiers, dependent: :nullify
+
+  EXPIRATION_LIMIT = 2.weeks
+
+  scope :pending, -> { where('created_at > ?', (Time.zone.now - EXPIRATION_LIMIT)) }
+  scope :stale, -> { where('created_at < ?', (Time.zone.now - EXPIRATION_LIMIT)) }
+  scope :with_dossiers, -> { joins(:dossiers) }
+
+  after_create_commit :send_notification
+
+  def self.initiate(email, dossiers)
+    create(email: email, dossiers: dossiers)
+  end
+
+  def self.accept(id, current_user)
+    transfer = pending.find_by(id: id, email: current_user.email)
+
+    if transfer && transfer.dossiers.present?
+      Invite
+        .where(dossier: transfer.dossiers, email: transfer.email)
+        .destroy_all
+      DossierTransferLog.create(transfer.dossiers.map do |dossier|
+        {
+          dossier: dossier,
+          from: dossier.user.email,
+          to: transfer.email
+        }
+      end)
+      transfer.dossiers.update_all(user_id: current_user.id)
+      transfer.destroy
+    end
+  end
+
+  def user_locale
+    User.find_by(email: email)&.locale || I18n.default_locale
+  end
+
+  private
+
+  def send_notification
+    DossierMailer.notify_transfer(self).deliver_later
+  end
+end