Is it possible to use closure_tree outside a rails application?

[iamrahulroy]

Trying to integrate Closure Tree with Ruby Serverless application based on Jets Framework.

The issue is, the moment I put has_closure_tree method inside the model, it starts throwing weird errors.

Error:

`connection_pool': ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished)

Traceback:

Traceback (most recent call last):
	35: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/bin/ruby_executable_hooks:24:in `<main>'
	34: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/bin/ruby_executable_hooks:24:in `eval'
	33: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/bin/jets:23:in `<main>'
	32: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/bin/jets:23:in `load'
	31: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/exe/jets:14:in `<top (required)>'
	30: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/cli.rb:5:in `start'
	29: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/cli.rb:20:in `start'
	28: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/cli.rb:48:in `boot_jets'
	27: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/core.rb:18:in `boot'
	26: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/booter.rb:24:in `boot!'
	25: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/booter.rb:201:in `eager_load_app'
	24: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/booter.rb:201:in `select'
	23: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/jets-1.8.9/lib/jets/booter.rb:218:in `block in eager_load_app'
	22: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/core_ext/string/inflections.rb:68:in `constantize'
	21: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/inflector/methods.rb:281:in `constantize'
	20: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/inflector/methods.rb:281:in `inject'
	19: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/inflector/methods.rb:281:in `each'
	18: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/inflector/methods.rb:283:in `block in constantize'
	17: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/inflector/methods.rb:283:in `const_get'
	16: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:195:in `const_missing'
	15: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:510:in `load_missing_constant'
	14: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:356:in `require_or_load'
	13: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:37:in `load_interlock'
	12: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies/interlock.rb:13:in `loading'
	11: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/concurrency/share_lock.rb:151:in `exclusive'
	10: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies/interlock.rb:14:in `block in loading'
	 9: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:37:in `block in load_interlock'
	 8: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:373:in `block in require_or_load'
	 7: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:475:in `load_file'
	 6: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:661:in `new_constants_in'
	 5: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:476:in `block in load_file'
	 4: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:476:in `load'
	 3: from /Users/rahul/instant_systems/dms-projects/dms_backend_api/app/models/document.rb:58:in `<top (required)>'
	 2: from /Users/rahul/instant_systems/dms-projects/dms_backend_api/app/models/document.rb:67:in `<class:Document>'
	 1: from /Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/closure_tree-7.0.0/lib/closure_tree/has_closure_tree.rb:35:in `has_closure_tree'
/Users/rahul/.rvm/gems/ruby-2.5.5@jets-gemset/gems/activerecord-5.2.3/lib/active_record/connection_handling.rb:114:in `connection_pool': ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished)

The error occurs when I run jets console. It disappears the moment I remove has_closure_tree method from my model.

EDIT: connection_pool.release_connection inside has_closure_tree method is causing the issue with jets.

[dmitry]

@iamtheschmitzer closure_tree bounded to the activerecord. Answer is yes, but only if you will use activerecord gem. :)

[wtn]

It looks like a load order problem. Please initialize ActiveRecord, including loading the database configuration and establishing a connection, before loading your models.

The principle applies in rails also. It isn't clearly documented, but you aren't supposed to use ActiveRecord models until the app is fully initialized.