Clear existing unconfirmed emails

lib/tasks/clear_unconfirmed_emails.rake

@@ -0,0 +1,4 @@
+desc "Clear unconfimed emails for deactivated users"
+task clear_unconfirmed_emails: :environment do
+  User.deactivated.where.not(unconfirmed_email: nil).update(unconfirmed_email: nil)
+end

spec/lib/tasks/clear_unconfirmed_emails_spec.rb

@@ -0,0 +1,36 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "clear_unconfirmed_emails" do
+  describe ":clear_unconfirmed_emails", type: :task do
+    subject(:task) { Rake::Task["clear_unconfirmed_emails"] }
+
+    before do
+      Rake.application.rake_require("tasks/clear_unconfirmed_emails")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      context "and there are deactivated users with unconfirmed emails" do
+        let!(:user) { create(:user, active: false, unconfirmed_email: "some_email@example.com") }
+
+        it "clears unconfirmed_email" do
+          task.invoke
+
+          expect(user.reload.unconfirmed_email).to eq(nil)
+        end
+      end
+
+      context "and there are active users with unconfirmed emails" do
+        let!(:user) { create(:user, active: true, unconfirmed_email: "some_email@example.com") }
+
+        it "does not clear unconfirmed_email" do
+          task.invoke
+
+          expect(user.reload.unconfirmed_email).not_to eq(nil)
+        end
+      end
+    end
+  end
+end