Namespacing and bootable components

streppa · December 13, 2017, 6:54am

icelab/berg/blob/master/system/boot/rom.rb

Berg::Container.namespace "persistence" do |persistence|
  persistence.finalize(:rom) do
    init do
      use :config

      require "sequel"
      require "rom"

      Sequel.database_timezone = :utc
      Sequel.application_timezone = :local

      rom_config = ROM::Configuration.new(
        :sql, config.database_url, extensions: [:error_sql, :pg_array, :pg_json]
      )

      persistence.register("config", rom_config)
    end

    start do
      config = container["persistence.config"]

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The above is an example from the Berg repo where a bootable component is wrapped in a namespace definition. I can’t get this pattern to work.

A gist with my attempt at following the berg example:

gist.github.com

https://gist.github.com/streppa/3643f16d7e0401a6e35d45e6616af11d

journey.rb

# /app/system/boot/journey.rb

Application.namespace :space do |space|
  space.finalize(:journey) do
    init do
      spaceship = Dry::Container.new
      spaceship.register :about, "A single thruster leisure vessel."
      space.register(:ship, spaceship)
    end

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output

Uncaught exception: Nothing registered with the key "space.ship"
	/home/streppa/dry-rb/dry-container/lib/dry/container/resolver.rb:22:in `block in call'
	/home/streppa/dry-rb/dry-container/lib/dry/container/resolver.rb:21:in `fetch'
	/home/streppa/dry-rb/dry-container/lib/dry/container/resolver.rb:21:in `call'
	/home/streppa/dry-rb/dry-container/lib/dry/container/mixin.rb:112:in `resolve'
	/home/streppa/dry-rb/dry-container/lib/dry/container/mixin.rb:125:in `[]'
	/home/streppa/blah/system/boot/journey.rb:10:in `block (3 levels) in <top (required)>'
	/home/streppa/dry-rb/dry-system/lib/dry/system/lifecycle.rb:119:in `trigger!'
	/home/streppa/dry-rb/dry-system/lib/dry/system/lifecycle.rb:84:in `start'
	/home/streppa/dry-rb/dry-system/lib/dry/system/lifecycle.rb:56:in `block in call'

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simple.rb

# /app/simple.rb
require 'dry/system/container'

Application Dry::System::Container
  configure do |config|
    config.name = :app
  end
end

Application.finalize!

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A nudge in the right direction would be helpful.

alejandrobabio · December 14, 2017, 7:50pm

@streppa, Berg is a great application to read and learn. But, it is still using an old version of dry-system (0.5.0).

If I were you I would refer to dry-system documentation to get the current way to boot a dependency. I think this could resolve your issue.

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Dry-system: adding aliases for components Support	3	444	February 12, 2021
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Interesting behavior (bug or useful feature ?) Support	0	644	February 2, 2017

Namespacing and bootable components

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