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= New Feature
* An enum plugin has been added. This plugin allows you to create
model-level enums, giving names to underlying values of a column.
For example:
Album.plugin :enum
Album.enum :status_id, good: 1, bad: 2
Adds Album#good! and Album#bad! for changing the status_id to 1 or
2 respectively. It adds Album#good? and Album#bad? for checking
whether the status_id is 1 or 2 respectively. It overrides
Album#status_id to return :good or :bad instead of 1 or 2,
respectively, and overrides Album#status_id= to accept :good or
:bad instead of 1 or 2 respectively.
Additionally, it adds good and bad dataset methods for filtering
the model's dataset to records where status_id is 1 or 2
respectively. It also adds not_good and not_bad dataset methods
for filtering the model's dataset to records where status_id is not
1 or not 2 respectively.
You can use :prefix and :suffix options when calling enum to
add a prefix or suffix to the method names created. You can
set the :override_accessors option to false to not override
the accessor methods for the column, and set the :dataset_methods
option to false to not add dataset methods.
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