Freshly generated --mode job app fails to send mails, missing ApplicationHelper

[tyler-wel]

Checklist

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My Environment

Software	Version
Operating System	macOS Catalina 10.15.7
Jets	2.3.18
Ruby	2.7.0

---

Expected Behaviour

After generating a new project via --mode job, be able to then generate a mailer and send the mail via the console

Current Behavior

ApplicationHelper is not created with --mode job and therefor creates an error when attempting to send a mail. See the error log below for more info.

Step-by-step reproduction instructions

jets new mail_test --database=postgresql --mode job
jets generate mailer TestMailer test_mail
jets c
TestMailer::test_mail.deliver_now

Error Log

irb(main):006:0> TestMailer::test_mail.deliver_now
D, [2021-01-18T16:02:30.892923 #75972] DEBUG -- : TestMailer#test_mail: processed outbound mail in 8.5ms
Traceback (most recent call last):
       16: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionview-6.1.1/lib/action_view/lookup_context.rb:258:in `block in initialize_details'
       15: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionview-6.1.1/lib/action_view/lookup_context.rb:51:in `block in <class:LookupContext>'
       14: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/jets-3.0.2/lib/jets/core_ext/kernel.rb:11:in `require'
       13: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/zeitwerk-2.4.2/lib/zeitwerk/kernel.rb:34:in `require'
       12: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/zeitwerk-2.4.2/lib/zeitwerk/kernel.rb:34:in `require'
       11: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionview-6.1.1/lib/action_view/base.rb:12:in `<top (required)>'
       10: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionview-6.1.1/lib/action_view/base.rb:141:in `<module:ActionView>'
        9: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/actionview-6.1.1/lib/action_view/base.rb:279:in `<class:Base>'
        8: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
        7: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:51:in `each'
        6: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
        5: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:66:in `execute_hook'
        4: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:61:in `with_execution_control'
        3: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
        2: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/activesupport-6.1.1/lib/active_support/lazy_load_hooks.rb:71:in `class_eval'
        1: from /.../.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/jets-3.0.2/lib/jets/controller/rendering/rack_renderer.rb:220:in `block in setup!'
NameError (uninitialized constant ApplicationHelper)
Did you mean?  ApplicationMailer

Code Sample

Nothing was changed from a freshly generated app.

Solution Suggestion

Generate the ApplicationHelper when generating with --mode job

[tyler-wel]

Changing to Ruby 2.5.8 fixed the issue

[AlexeyDemidov]

I have hit the same issue with the missing ApplicationHelper. Switching to Ruby 2.5.8 is not an option as it reached EOL. The proper solution is to generate app/helpers/application_helper.rb

[tongueroo]

Fixed in #674