Paper Trail gem使名称版本的字段不可用

Question

I have a table named clients backed by an AR model Client . This is the structure of clients table:

clients
  - id <serial primary key>
  - name <varchar(255)>
  - version <varchar(255)>

I have added versioning to it using the paper trail gem. However, when I update or create the record, the column version does not update. And when I do Client.first.version it gives me nil value even though all my records in the table have a version column that is not null or empty. I suspect this is because of paper trail gem. When I switch my project's branch to a version that does not use the gem, I am able to get non-nil value of version.

Is there any workaround to fix this issue?

Answer 1

Sure, there is. Problem is, version is the default association name in paper_trail, thus calling the association on client rather than fetching it's attribute. You can change your model as:

class Client < ActiveRecord::Base
  has_paper_trail version: :paper_version, versions: :paper_versions
end

c = Client.first
c.version #=> row field
c.paper_versions #=> previous versions.

Edit: Just found that it is also documented in paper_trail here - https://github.com/airblade/paper_trail#6-extensibility