Fix Zeitwerk autoloading when ActionMailer is not present. #5731
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When ActionMailer is not defined we have empty app/mailers/devise/mailer.rb file and Zeitwerk doesn't like that and errors with ``` expected file app/mailers/devise/mailer.rb to define constant Devise::Mailer ``` The fix is to tell Zeitwerk to ignore that file if ActionMailer constant if not defined. I tried to write a spec for it but since specs are run in the same process it's hard to have two Rails applications where one of them has ActionMailer define and the seconds one doesn't.
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This was referenced Nov 25, 2024
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When
ActionMaileris not defined we have emptyapp/mailers/devise/mailer.rbfile and Zeitwerk doesn't like that and errors withexpected file app/mailers/devise/mailer.rb to define constant Devise::MailerThe fix is to tell Zeitwerk to ignore that file if
ActionMailerconstant if not defined.I tried to write a spec for it but since specs are run in the same process it's hard to have two Rails applications where one of them has
ActionMailerdefine and the seconds one doesn't.closes #5140, #5485