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Puma on Heroku
Rails.application.config.after_initialize do
ActiveSupport.on_load(:active_record) do
if Rails.application.config.database_configuration
config = Rails.application.config.database_configuration[Rails.env]
config['reaping_frequency'] = ENV['DB_REAP_FREQ'] || 10 # seconds
config['pool'] = ENV['DB_POOL'] || 5
gem 'foreman'
gem 'puma'
web: bundle exec puma -t ${PUMA_MIN_THREADS:-8}:${PUMA_MAX_THREADS:-12} -w ${PUMA_WORKERS:-2} -p $PORT -e ${RACK_ENV:-development}
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joshhepworth commented Feb 6, 2014

How do you normally start your development server when you're using this Procfile? I've gotten in the habit of just doing foreman start web and that throws errors locally with the above Procfile because my local environment doesn't seem to support that syntax. I've tried in zsh and bash 3.2.

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kivanio commented Feb 7, 2014


RACK_ENV=development foreman start

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osazemeu commented Apr 6, 2021

For rails 6, am getting the following error
DEPRECATION WARNING: [] is deprecated and will be removed from Rails 6.2 (Use configs_for)
can't modify frozen Hash #Ln 8

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