Not part of the usual app flow so contain to rake task

app/models/user.rb

@@ -67,7 +67,6 @@ class User < ApplicationRecord
   MFA_TEMPLATE_ID = "6bdf5ee1-8e01-4be1-b1f9-747061d8a24c".freeze
   RESET_PASSWORD_TEMPLATE_ID = "2c410c19-80a7-481c-a531-2bcb3264f8e6".freeze
   SET_PASSWORD_TEMPLATE_ID   = "257460a6-6616-4640-a3f9-17c3d73d9e91".freeze
-  BETA_ONBOARDING_TEMPLATE_ID = "b48bc2cd-5887-4611-8296-d0ab3ed0e7fd".freeze
 
   def reset_password_notify_template
     last_sign_in_at ? RESET_PASSWORD_TEMPLATE_ID : SET_PASSWORD_TEMPLATE_ID
@@ -83,16 +82,6 @@ class User < ApplicationRecord
     DeviseNotifyMailer.new.send_email(email, template_id, personalisation)
   end
 
-  def send_beta_onboarding_email(host)
-    return unless URI::MailTo::EMAIL_REGEXP.match?(email) && host
-
-    template_id = BETA_ONBOARDING_TEMPLATE_ID
-    url = edit_user_password_url({ host: })
-    token = Devise.token_generator.generate(User, :reset_password_token)
-    personalisation = { name: name || email, link: "#{url}?reset_password_token=#{token}" }
-    DeviseNotifyMailer.new.send_email(email, template_id, personalisation)
-  end
-
   def assignable_roles
     return {} unless data_coordinator? || support?
     return ROLES if support?

lib/tasks/onboarding_emails.rake

@@ -11,6 +11,14 @@ namespace :onboarding_emails do
     organisation = Organisation.find(organisation_id)
     raise "Organisation #{organisation_id} does not exist" unless organisation
 
-    organisation.users.each { |user| user.send_beta_onboarding_email(host) }
+    organisation.users.each do |user|
+      return unless URI::MailTo::EMAIL_REGEXP.match?(user.email)
+
+      onboarding_template_id = "b48bc2cd-5887-4611-8296-d0ab3ed0e7fd".freeze
+      token = user.send(:set_reset_password_token)
+      url = "#{host}/account/password/edit?reset_password_token=#{token}"
+      personalisation = { name: user.name || user.email, link: url }
+      DeviseNotifyMailer.new.send_email(user.email, onboarding_template_id, personalisation)
+    end
   end
 end

spec/lib/tasks/onboarding_emails_spec.rb

@@ -12,7 +12,6 @@ describe "rake onboarding_emails:send", type: task do
 
     before do
       Rake.application.rake_require("tasks/onboarding_emails")
-      Rake::Task.define_task(:environment)
       task.reenable
       allow(DeviseNotifyMailer).to receive(:new).and_return(devise_notify_mailer)
       allow(devise_notify_mailer).to receive(:notify_client).and_return(notify_client)