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| author | Matthew Erhard <merhard@gmail.com> | 2016-05-11 13:09:34 -0400 |
|---|---|---|
| committer | Matthew Erhard <merhard@gmail.com> | 2016-05-11 13:21:01 -0400 |
| commit | 556e530da41dce5ae8070e8e075390bbedb949c0 (patch) | |
| tree | 356ccae535f0a627119a11a8e1cd23f6be829a13 /guides/source/initialization.md | |
| parent | 59d252196b36f6afaafd231756d69ea21537cf5d (diff) | |
| download | rails-556e530da41dce5ae8070e8e075390bbedb949c0.tar.gz rails-556e530da41dce5ae8070e8e075390bbedb949c0.tar.bz2 rails-556e530da41dce5ae8070e8e075390bbedb949c0.zip | |
Define ActiveRecord::Attribute::Null#type_cast
Using ActiveRecord::Base.attribute to declare an attribute with a default value on a model where the attribute is not backed by the database would raise a NotImplementedError when model.save is called.
The error originates from https://github.com/rails/rails/blob/59d252196b36f6afaafd231756d69ea21537cf5d/activerecord/lib/active_record/attribute.rb#L84.
This is called from https://github.com/rails/rails/blob/59d252196b36f6afaafd231756d69ea21537cf5d/activerecord/lib/active_record/attribute.rb#L46 on an ActiveRecord::Attribute::Null object.
This commit corrects the behavior by implementing ActiveRecord::Attribute::Null#type_cast.
With ActiveRecord::Attribute::Null#type_cast defined, ActiveRecord::Attribute::Null#value (https://github.com/rails/rails/blob/59d252196b36f6afaafd231756d69ea21537cf5d/activerecord/lib/active_record/attribute.rb#L173..L175) can be replaced with its super method (https://github.com/rails/rails/blob/59d252196b36f6afaafd231756d69ea21537cf5d/activerecord/lib/active_record/attribute.rb#L36..L40).
fixes #24979
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