Why is Rails not writing to development.log

OK, after much going round in circles, I finally found the culprit.

The rails_12factor is apparently overwriting config.logger.

See: https://github.com/heroku/rails_stdout_logging/blob/master/lib/rails_stdout_logging/rails3.rb#L7

I removed this gem from the development environment (I really only need it in the deployed environment) and everything is now working.

To put a gem in production only, it needs to be in a gem environment group like this:

# This is override development.log output and should only go in production.
group :production do
  gem 'rails_12factor'
end

Thanks @maxd for helping to get me thinking in the right direction.

Add the following line to config/environments/development.rb

config.log_level = :debug

restart server

I think your problem can be caused by the following things:

You set to high log level. Check your application.rb and environments\*.rb files:
```
# Set to :debug to see everything in the log.
config.log_level = :error
```

You set custom logging. Check your application.rb, environments/*.rb and all files in initializers/*.rb:

# Use a different logger for distributed setups.
config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)

These two steps should help you to investigate problem and fix it.

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