Module: Trailblazer::Operation::Nested

Defined in:
lib/trailblazer/operation/nested.rb

Defined Under Namespace

Classes: Caller, Options

Class Method Summary collapse

Class Method Details

.for(step, input, output) ⇒ Object

Please note that the instance_variable_get are here on purpose since the superinternal API is not entirely decided, yet.



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# File 'lib/trailblazer/operation/nested.rb', line 25

def self.for(step, input, output) # DISCUSS: use builders here?
  invoker            = Caller::Dynamic.new(step)
  invoker            = Caller.new(step) if step.is_a?(Class) && step <= Trailblazer::Operation # interestingly, with < we get a weird nil exception. bug in Ruby?

  options_for_nested = Options.new
  options_for_nested = Options::Dynamic.new(input) if input

  options_for_composer = Options::Output.new
  options_for_composer = Options::Output::Dynamic.new(output) if output

  # This lambda is the strut added on the track, executed at runtime.
  ->(operation, options) do
    result = invoker.(operation, options, options_for_nested.(operation, options)) # TODO: what about containers?

    options_for_composer.(operation, options, result).each { |k,v| options[k] = v }

    result.success? # DISCUSS: what if we could simply return the result object here?
  end
end