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Docs: Update STI docs re: 23ffbdc7e1 

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Jared Beck 2016-05-04 14:56:10 -04:00
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@ -984,28 +984,20 @@ then there is no need to use `attr_accessible`.
## Single Table Inheritance (STI)
PaperTrail supports [Single Table Inheritance][39], but the base
model must be versioned (must call `has_paper_trail`).
PaperTrail supports [Single Table Inheritance][39], and even supports an
un-versioned base model, as of 23ffbdc7e1.
```ruby
# correct
class Fruit < ActiveRecord::Base
has_paper_trail
end
class Banana < Fruit
end
# incorrect
class Fruit < ActiveRecord::Base
# un-versioned base model
end
class Banana < Fruit
has_paper_trail
end
```
In order to support [polymorphic associations][40], when PaperTrail inserts
records in the the `versions` table, it saves the name of the base class in the
`item_type` column, as required by ActiveRecord.
However, there is a known issue when reifying [associations](#associations),
see https://github.com/airblade/paper_trail/issues/594
## Custom Version Classes