Rails eager loading detected when saving with has_many through association - ruby-on-rails

Question

Bullet gem detected an eager loading on create. Consider the following models:
class User < ActiveRecord::Base
has_many :user_banks
has_many :banks, through: :user_banks
end
class Bank < ActiveRecord::Base
belongs_to :country
belongs_to :currency
has_many :user_posts
has_many :users, through: :user_banks
end
class UserBank < ActiveRecord::Base
belongs_to :user
belongs_to :bank
end
In my controller, when creating user:
# GET /user/new
def new
#user = User.new
end
# POST /users
def create
#user = User.new(user_params)
if #user.save
redirect_to user_path(#user), notice: I18n.t('views.action.created')
else
render :new
end
end
private
def user_params
params.fetch(:user, {}).permit(:name, :email, bank_ids: [])
end
I've got an error;
Bullet::Notification::UnoptimizedQueryError:
user: ruby
POST /admin/users
USE eager loading detected
Bank => [:country]
Add to your query: .includes([:country])
Call stack
/src/app/controllers/admin/users_controller.rb:36:in `create'
The Rails code that eager loads has_many through associations is unfortunately a bit buggy.
How do I solve this? to eager load the country and currency of the Bank.
If you will try in Rails console something like this;
[1] pry(main)> User.new(name: 'test', email: 'test#test.com', bank_ids: [1, 2]).save!
Country Load (1.3ms) SELECT `countries`.`id`, `countries`.`created_at`, `countries`.`updated_at`, `countries`.`code` FROM `countries` WHERE `countries`.`id` = 1 LIMIT 1
Currency Load (0.4ms) SELECT `currencies`.* FROM `currencies` WHERE `currencies`.`id` = 1 LIMIT 1
Country Load (1.3ms) SELECT `countries`.`id`, `countries`.`created_at`, `countries`.`updated_at`, `countries`.`code` FROM `countries` WHERE `countries`.`id` = 1 LIMIT 1
Currency Load (0.4ms) SELECT `currencies`.* FROM `currencies` WHERE `currencies`.`id` = 1 LIMIT 1
User Create (0.5ms) INSERT INTO `users` (`name`, `email`, `created_at`, `updated_at`) VALUES ('test', 'test#test.com', '2020-06-25 06:18:50', '2020-06-25 06:18:50')
UserBank Create (1.0ms) INSERT INTO `user_banks` (`user_id`, `bank_id`, `created_at`, `updated_at`) VALUES (1, 1, '2020-06-25 06:18:50', '2020-06-25 06:18:50')
UserBank Create (0.4ms) INSERT INTO `user_banks` (`user_id`, `bank_id`, `created_at`, `updated_at`) VALUES (1, 2, '2020-06-25 06:18:50', '2020-06-25 06:18:50')

Answer 1

Try:
User.new(name: 'test',
email: 'test#test.com',
banks: Bank.eager_load(:country, :currency).find([1, 2])
).save!