Simple Services

Creates a simple services layer with automatic transactional demarcation. To use, simply create a folder at app/services, and add classes that derive from Service::Base. That’s it. All the methods in the service will be wrapped in a transaction by default. Any exception within that method will rollback the transaction.

Services are singletons to reduce memory overhead. And since they’re singletons, they MUST remain stateless.

Dependencies

SimpleServices relies on Aquarium for method aspecting.

sudo gem install aquarium

Example

in RAILS_ROOT/app/services class AccountService < Service::Base
def transfer(base_acct, target_acct, amt)
```
base_acct.balance -= amt
base_acct.save!
target_acct.balance += amt
target_acct.save!
```
end

end

class AccountController &lt; ApplicationController

adds two methods to instances of this controller:
account_service
user_service services :account, :user

def update
  base = Account.find(params[:base_id])
  target = Account.find(params[:target_id])
  # use service.  enjoy transactions.  lather. rinse. repeat.
  account_service.transfer(base, target, params[:amount])
end