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Docs: Clarify how to control order of AR callbacks 

Backport: 4.1-stable

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Jared Beck 2016-01-18 13:08:30 -05:00
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@ -276,15 +276,22 @@ their order, use the `paper_trail_on_*` methods.
```ruby
class Article < ActiveRecord::Base
has_paper_trail :on => [] # don't install callbacks yet
paper_trail_on_destroy # install destroy
# Include PaperTrail, but do not add any callbacks yet. Passing the
# empty array to `:on` omits callbacks.
has_paper_trail :on => []
# Add callbacks in the order you need.
paper_trail_on_destroy # add destroy callback
paper_trail_on_update # etc.
paper_trail_on_create
end
```
The `paper_trail_on_destroy` method can be further configured to happen
`:before` or `:after` the destroy event. By default, it will happen before.
`:before` or `:after` the destroy event. In PaperTrail 4, the default is
`:after`. In PaperTrail 5, the default will be `:before`, to support
ActiveRecord 5. (see https://github.com/airblade/paper_trail/pull/683)
## Choosing When To Save New Versions