# Sample controller
def create
	ctx = Pipes::Context.new(…..)
	flow.call(ctx)
	render json: ctx.project, status: :ok
	# no need for handling specific exceptions of multiple types
resuce Pipes::Error => e
	render json: {errors: e.message}
end

class SaveProject
	def call
	  ctx.project.save!
	end

	rescue RecordInvalid => e
	  # hide the internals of record invalid for the public pipes api
		ctx.fail(e, e.record.errors.full_messages)
	end
end

class Pipes::Context
	attr_reader :error

	def fail(error)
		@error = error
		fail Pipes::Error
	end

	def success?
	  @error.nil?

	def error?
    !success?
  end
end

# May not be the best idea, but
# returning a boolean and then accessing ctx.error instead of raising
# an exception for controlling the flow sounds good to me
module Pipe
	def method_missing

	rescue Pipes::Error

	end
end