solnic / virtus / 801

75%

Pull #292

travis-ci

Implement the feature of allowing a default value when the attribute is assigned as nil:

- Replace the Virtus::Attribute::Accessor#defined? method for the #present? method in the Virtus::AttributeSet#skip_default? private method
- Replace the #instance_variable_defined? method for the Virtus::Attribute::Accessor#present? method in the Virtus::Attribute::LazyDefault#get method
- Update the README with the documentation of this feature

This fixes Github issue #291 (https://github.com/solnic/virtus/issues/291) and #172 (https://github.com/solnic/virtus/issues/172)

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