Pavel Mikhailyuk questions

Pavel Mikhailyuk answers

• Can "!ruby/hash:ActionController::Parameters" be removed when object.to_yaml (YAML) in ruby on rails?
• Why would you set `null: false, default: ""` on a required DB column?
• Nginx error: client intended to send too large body
• Extend the ActiveSupport::Notifications.subscribe, instantiation.active_record hook
• Strange behave of ruby attr_accessor