Add interactor MergeAccountPerson

app/interactors/merge_account_person.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class MergeAccountPerson
+  include Interactor::Organizer
+
+  organize MergeContactLists, SetAccountPerson, DestroyContactList
+
+  around do |interactor|
+    ActiveRecord::Base.transaction do
+      interactor.call
+    end
+  end
+
+  before do
+    context.from                     = context.account.contact_list
+    context.to                       = context.person.contact_list
+    context.destroyable_contact_list = context.account.contact_list
+  end
+end

app/interactors/set_account_person.rb

@@ -4,7 +4,11 @@ class SetAccountPerson
   include Interactor
 
   def call
+    old_contact_list = context.account.contact_list
+
     context.account.update! person: context.person,
-                            contact_list: context.new_contact_list
+                            contact_list: context.person.contact_list
+
+    old_contact_list.reload
   end
 end

factories/contact_networks.rb

@@ -3,6 +3,6 @@
 FactoryBot.define do
   factory :contact_network, class: ContactNetwork do
     nickname { Faker::Internet.username 3..36, %w[_] }
-    public_name { Faker::Company.name }
+    public_name { Faker::Company.unique.name }
   end
 end

spec/interactors/merge_account_person_spec.rb

@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe MergeAccountPerson do
+  subject { described_class.call account: account, person: person }
+
+  let(:account) { create :usual_account, contact_list: old_contact_list }
+  let(:person) { create :initial_person, contact_list: new_contact_list }
+
+  let(:old_contact_list) { create :some_contact_list }
+  let(:new_contact_list) { create :some_contact_list }
+
+  specify do
+    expect { subject }.to \
+      change(account, :person)
+      .from(nil)
+      .to(person)
+  end
+
+  specify do
+    expect { subject }.to \
+      change(person, :account)
+      .from(nil)
+      .to(account)
+  end
+
+  specify do
+    expect { subject }.to \
+      change(account, :contact_list)
+      .from(old_contact_list)
+      .to(new_contact_list)
+  end
+
+  specify do
+    expect { subject }.not_to \
+      change(person, :contact_list)
+      .from(new_contact_list)
+  end
+
+  specify do
+    expect { subject }.to \
+      change(old_contact_list.contacts, :count)
+      .from(old_contact_list.contacts.count)
+      .to(0)
+  end
+
+  specify do
+    expect { subject }.to \
+      change(new_contact_list.contacts, :count)
+      .from(new_contact_list.contacts.count)
+      .to(old_contact_list.contacts.count + new_contact_list.contacts.count)
+  end
+
+  specify do
+    expect { subject }.to \
+      change(old_contact_list.contacts, :to_a)
+      .from(old_contact_list.contacts.to_a)
+      .to([])
+  end
+
+  specify do
+    expect { subject }.to \
+      change(new_contact_list.contacts, :to_a)
+      .from(new_contact_list.contacts.to_a)
+      .to(new_contact_list.contacts.to_a + old_contact_list.contacts.to_a)
+  end
+end