When generating a mailer, you must specify Mailer in the class name #23500
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The usage docs for generating a mailer are missing Mailer in the name of the mailer. If you don't add Mailer to the name, your views and tests are generated incorrectly.
Based on the existing docs, if you do this:
rails generate mailer School welcome
The views will be put in app/views/school and the tests will refer to a School class.
You must run the generator like this:
rails generate mailer SchoolMailer welcome
These comment and usage changes reflect this requirement.