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Category: Rails (page 1 of 71)

[ActiveRecord] Get a polymorphic owner class out of the owned object

The question is: how can we retrieve a owners class of a polymorphic association without loading the owner object into memory?

class Source < ApplicationRecord
  self.has_one :state,
    dependent: :delete,
    as: :stateable
end

class State < ApplicationRecord
  belongs_to :stateable,
    polymorphic: true
end

Solution

There are (at least) two ways to do this. First one is not recommended (as it might fail with multiple namespaces with same class names, etc:

State.last.stateable_type.constantize #=> Source

or a better one that will work out of any scope:

State.last.association(:stateable).klass #=> Source

Errbit + HTTPS: Setting up Errbit reporter (Airbrake v5 gem) to work with self-signed HTTPS certificate

Note: If you’re using old Errbit version (0.2.0, 0.4.0) and an old Airbrake version (v4) please refer to this manual to make it work with self-signed certificates.

Having an error catcher like Errbit behind SSL is generally a good idea. Especially when Errbit is hosted on a different server than you application (for example when you manage multiple apps with one Errbit instance). In many cases you will have a self-signed certificate (why would you pay for a cert for internal tool). If you try to use it with Airbrake, you will see following error:

Airbrake:
  HTTP error: SSL_connect returned=1 errno=0 state=unknown state: certificate verify failed

Unfortunately, global SSL certificates verification disabling hack (solution that used to work with Airbrake notifier v4) won’t work:

# No longer working!
OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE

Luckily, Airbrake notifier is written pretty well, so hacking it (and disabling per request SSL certificate verification) is not hard at all. Here’s a full code you need to place in config/initializers/errbit.rb to make it work:

module Patches
  module Airbrake
    module SyncSender
      def build_https(uri)
        super.tap do |req|
          req.verify_mode = OpenSSL::SSL::VERIFY_NONE
        end
      end
    end
  end
end

Airbrake::SyncSender.prepend(::Patches::Airbrake::SyncSender)

After that (and configuring Airbrake notifier), you can test it out like this:

Airbrake.notify :test
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