fix admin component generator namespace

[ccarruitero]

This PR is sponsored by 🌋 MagmaLabs

Summary

Admin component generator is failing on a clean solidus installation.

$ ./bin/rails g solidus_admin:component event
[WARNING Spree] Missing migrations.
[WARNING Spree] - add_reverse_charge_status_to_store
[WARNING Spree] - add_vat_id_email_and_reverse_charge_status_to_addresses
[WARNING Spree]
[WARNING Spree] Run `bin/rails railties:install:migrations` to get them.
[WARNING Spree] You can silence this warning by setting the `SOLIDUS_SKIP_MIGRATIONS_CHECK` environment variable.
      create  app/components/event/component.html.erb
/home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/railties-8.0.2/lib/rails/generators/base.rb:321:in `namespace_dirs': undefined method `name' for nil (NoMethodError)

          @namespace_dirs ||= namespace.name.split("::").map(&:underscore)
                                       ^^^^^
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/railties-8.0.2/lib/rails/generators/base.rb:325:in `namespaced_path'
	from /home/yoh/tmp/solidus/admin/lib/generators/solidus_admin/component/templates/component.rb.tt:3:in `template'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/erb-5.0.1/lib/erb.rb:427:in `eval'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/erb-5.0.1/lib/erb.rb:427:in `result'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/file_manipulation.rb:128:in `block in template'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/create_file.rb:54:in `render'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/create_file.rb:64:in `block (2 levels) in invoke!'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/create_file.rb:64:in `open'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/create_file.rb:64:in `block in invoke!'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/empty_directory.rb:117:in `invoke_with_conflict_check'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/create_file.rb:61:in `invoke!'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions.rb:93:in `action'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/create_file.rb:25:in `create_file'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/actions/file_manipulation.rb:124:in `template'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/railties-8.0.2/lib/rails/generators/named_base.rb:25:in `block in template'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/railties-8.0.2/lib/rails/generators/named_base.rb:45:in `inside_template'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/railties-8.0.2/lib/rails/generators/named_base.rb:24:in `template'
	from /home/yoh/tmp/solidus/admin/lib/generators/solidus_admin/component/component_generator.rb:29:in `create_component_files'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/command.rb:28:in `run'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/invocation.rb:127:in `invoke_command'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/invocation.rb:134:in `block in invoke_all'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/invocation.rb:134:in `each'
	from /home/yoh/.rvm/gems/ruby-3.3.7@commerze/gems/thor-1.3.2/lib/thor/invocation.rb:134:in `map'

Error comes from https://github.com/rails/rails/blob/3235827585d87661942c91bc81f64f56d710f0b2/railties/lib/rails/generators/base.rb#L321 due to namespace is returning nil.

This method was called from component.rb template
https://github.com/solidusio/solidus/blob/main/admin/lib/generators/solidus_admin/component/templates/component.rb.tt#L3
https://github.com/rails/rails/blob/3235827585d87661942c91bc81f64f56d710f0b2/railties/lib/rails/generators/base.rb#L324

So we need to define namespace into gem or host app to fix it. For now, I think would be easier to fix by adding into initializer template.

Let me know what you think?

Looking into specs found that are passing because we already seated namespace for generators specs
https://github.com/solidusio/solidus/blob/main/admin/spec/spec_helper.rb#L115

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.82%. Comparing base (cfb5acb) to head (dc0495d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6237   +/-   ##
=======================================
  Coverage   88.82%   88.82%           
=======================================
  Files         851      851           
  Lines       18349    18349           
=======================================
  Hits        16299    16299           
  Misses       2050     2050           

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