Load problem when used outside of Rails (No connection pool for PaperTrail::VersionAssociation)

[codingluke]

Hello, we are using paper_trail in a non Rails Project, just together with ActiveRecord. PaperTrail is in this situation not dynamically loaded, so we have to load it manually with require 'paper_trail' before defining our models. So far so good.

On loading, the config.rb is doing a database lookup to check whether the table version_associations is available or not (https://github.com/airblade/paper_trail/blob/4.1-stable/lib/paper_trail/config.rb#L32). As in our case the database connection is done later, we encounter the error No connection pool for PaperTrail::VersionAssociation (ActiveRecord::ConnectionNotEstablished)

We could fix this with the simple Monkey Patch below. As we are not using the track-association-feature, we just overwrite the PaperTrail::Config.track_associations? method before loading paper_trail. In my opinion, it would be better to explicit enable/disable the track_association feature instead of magically enable it when the table exists. This would fix the loading problem in a non rails environment.

require 'paper_trail/config'
module PaperTrail
    class Config
        def track_associations?
            false
        end
    end
end
require 'paper_trail'

[jaredbeck]

Hi Lukas. I think this is basically a duplicate of #740

Thanks!