diff options
Diffstat (limited to 'activerecord/lib')
| -rw-r--r-- | activerecord/lib/active_record/base.rb | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb index 32e7c50588..e93e4b6e3d 100644 --- a/activerecord/lib/active_record/base.rb +++ b/activerecord/lib/active_record/base.rb @@ -233,6 +233,15 @@ module ActiveRecord #:nodoc: # the companies table with type = "Firm". You can then fetch this row again using # <tt>Company.where(name: '37signals').first</tt> and it will return a Firm object. # + # Be aware that because the type column is an attribute on the record every new + # subclass will instantly be marked as dirty and the type column will be included + # in the list of changed attributes on the record. This is different from non + # STI classes: + # + # Company.new.changed? # => false + # Firm.new.changed? # => true + # Firm.new.changes # => {"type"=>["","Firm"]} + # # If you don't have a type column defined in your table, single-table inheritance won't # be triggered. In that case, it'll work just like normal subclasses with no special magic # for differentiating between them or reloading the right type with find. |