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Note that test_after_commit is only required before Rails v5.0
Updated Problems and Troubleshooting (markdown)
Add link for more details about autoloading and thread-safety in Rails. I wanted to understand the issue deeper than "will only cause pain" and this helped.
Typo fix
Update Ruby Syntax
Remove duplicated query cache section and reference it
Add section on disabling AR query cache for batched reads
Updated Problems and Troubleshooting, resolve RoutingError
Adding the mail gem to the list of troublesome gems
add syntax highlight