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Remove references to AR::Observer from docs

ActiveRecord::Observer was extracted into a separate gem so it
should not be referenced anymore (see ccecab3)
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commit 20c03e7037dc480ef43bda893435dcd178cc639b 1 parent 76c432f
@claudiob claudiob authored
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11 activerecord/README.rdoc
@@ -80,17 +80,6 @@ A short rundown of some of the major features:
{Learn more}[link:classes/ActiveRecord/Callbacks.html]
-* Observers that react to changes in a model.
-
- class CommentObserver < ActiveRecord::Observer
- def after_create(comment) # is called just after Comment#save
- CommentMailer.new_comment_email('david@loudthinking.com', comment).deliver
- end
- end
-
- {Learn more}[link:classes/ActiveRecord/Observer.html]
-
-
* Inheritance hierarchies.
class Company < ActiveRecord::Base; end
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8 guides/source/active_support_core_extensions.md
@@ -2067,14 +2067,6 @@ The sum of an empty receiver can be customized in this form as well:
[].sum(1) {|n| n**3} # => 1
```
-The method `ActiveRecord::Observer#observed_subclasses` for example is implemented this way:
-
-```ruby
-def observed_subclasses
- observed_classes.sum([]) { |klass| klass.send(:subclasses) }
-end
-```
-
NOTE: Defined in `active_support/core_ext/enumerable.rb`.
### `index_by`
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