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[ci skip] Add :private option to delegate section in guide

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Yoshiyuki Hirano 2018-04-04 20:04:10 +09:00
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guides/source/active_support_core_extensions.md
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@ -779,6 +779,14 @@ delegate :size, to: :attachment, prefix: :avatar
In the previous example the macro generates `avatar_size` rather than `size`.
The option `:private` changes methods scope:
```ruby
delegate :date_of_birth, to: :profile, private: true
```
The delegated methods are public by default. Pass `private: true` to change that.
NOTE: Defined in `active_support/core_ext/module/delegation.rb`
#### `delegate_missing_to`