Commits on Sep 13, 2024

1. Add extension for Sequel transactions …

   We add a `Dry::Operation::Extensions::Sequel` module that, when included, gives access to a `#transaction` method. This method wraps the yielded steps in a [Sequel](https://sequel.jeremyevans.net/) transaction, rolling back in case one of them returns a failure.
   
   The extension expects the including class to define a `#db` method giving access to the Sequel database definition:
   
   ```ruby
   class MyOperation < Dry::Operation
     include Dry::Operation::Extensions::Sequel
   
     attr_reader :db
   
     def initialize(db:)
       @db = db
     end
   
     def call(input)
       attrs = step validate(input)
       user = transaction do
         new_user = step persist(attrs)
         step assign_initial_role(new_user)
         new_user
       end
       step notify(user)
       user
     end
   
     # ...
   end
   ```
   
   Default options for the `#transaction` options (which delegates to Sequel [transaction method](https://sequel.jeremyevans.net/rdoc/files/doc/transactions_rdoc.html)) can be given both at include time with `include Dry::Operation::Extensions::Sequel[isolation: :serializable]`, and at runtime with `#transaction(isolation: :serializable)`.

   

   waiting-for-dev committed Sep 13, 2024
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