This gem provides a seamless-er™ upgrade from TRB 1.1 to 2.x.
It allows to run both old TRB 1.1 operations along with new or refactored 2.x code in the same application, making it easier to upgrade operation code
step-wise (no pun intended!) or add new TRB2 operations, workflows, etc. without having to change the old code.
Your exisiting application's
Gemfile should point to the new
gem "trailblazer", ">= 2.0.6" gem "trailblazer-compat"
In a Rails application, you also need to pull the 1.x line of the
gem "trailblazer-rails", ">= 1.0.3"
Upgrade Path / Overview
The complete migration path is documented here.
You can keep old TRB1 operations.
# /app/concepts/song/create.rb class Song class Create < :: model Song, :create policy Song::Policy, :admin? contract do property :id # ... end def process(params) validate(params[:song]) do |form| form.save end end end end
At any point, you can introduce new TRB2 operations or update old classes by inheriting from
# /app/concepts/song/create.rb class Song class Create < ::.version(2) class Form < Reform::Form property :id # ... end class New < ::.version(2) step Model( Song, :new ) step Policy::Pundit( Song::Policy, :admin? ) step Contract::Build( constant: Form ) end step Nested(New) step Contract::Validate( key: :admin ) step Contract::Persist() end end
Should you ever be finished updating your application, simply remove the
trailblazer-compatgem from the
Gemfile. You can then safely delete
.version(2)across all files.
compat gem tries to make the transition to newer versions as painless as possible. However, if you run into any problems specific to your application, please don't hesitate to contact us. Pull requests (even ugly hacks) are appreciated in this gem, and this gem only.