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RailsCallbackLog

Do you have a rails app with a lot of callbacks? Are they kind of a mystery? Maybe logging them would help.

Started GET "/" for 127.0.0.1 at 2016-07-26 13:25:32 -0400
Processing by HomeController#index as HTML
Callback: verify_authenticity_token
Callback: activate_authlogic
Callback: require_client_subdomain
  Client Load (0.4ms)  SELECT  `clients`.* ...
Callback: check_hostname
Callback: update_last_request_at
...

Installation

# Gemfile
gem "rails-callback_log", group: [:development, :test]

Do not use this gem in production because it adds significant overhead.

Filtering Output

Rails has a lot of its own callbacks that you probably don't care about. If you don't want to log them, enable filtering.

# Enable filtering
export RAILS_CALLBACK_LOG_FILTER="make it so"

# Disable filtering
unset RAILS_CALLBACK_LOG_FILTER

Filtering incurs a serious performance penalty, so it is off by default.

Team Opt-in

When working in a team and logging is needed only for select members, use this environment-based opt-in pattern:

# Gemfile
gem "rails-callback_log",
  group: [:development, :test],
  require: (ENV["LOG_RAILS_CALLBACKS"] == "true")

See Also

License

The gem is available as open source under the terms of the MIT License.

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Logs callbacks to help with debugging.

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