Composite Primary Key id method docs #49112
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Adds documentation to exaplain composite key behaviour in ActiveRecord::AttributeMethods::PrimaryKey for methods #id, #id=, #id?, #id_before_type_cast, #id_was, #id_in_database.
Adds documention for ActiveRecord::ModelSchema#id_value as a utility when using composite primary keys.
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Motivation / Background
This Pull Request has been created because Active Record's CPK support needs documentation.
Detail
This Pull Request changes Active Record to add docs for #id, #id=, #id?, #id_before_type_cast, #id_was, #id_in_database, and #id_value.
#id_value was added in #48930.
Checklist
Before submitting the PR make sure the following are checked:
[Fix #issue-number]