index_by

index_by()

Instance Public methods

Convert an enumerable to a hash.

people.index_by(&:login)
  => { "nextangle" => <Person ...>, "chade-" => <Person ...>, ...}
people.index_by { |person| "#{person.first_name} #{person.last_name}" }
  => { "Chade- Fowlersburg-e" => <Person ...>, "David Heinemeier Hansson" => <Person ...>, ...}

Links:

https://github.com/rails/rails/blob/a476020567a47f5fbec3629707d5bf31b400a284/activesupport/lib/active_support/core_ext/enumerable.rb#L34

doc_ruby_on_rails

2025-01-10 15:47:30

Comments

Popular Articles

Indexes and ORDER BY In addition to simply finding the rows to be returned by a query, an index may be able to deliver them in a specific sorted order. This allows a quer

set_value_by_index set_value_by_index(idx) Instance Public methods Also aliased as: set_value, set_index_value

By Experimental Class Class Overview class By { staticall() : Predicate<DebugElement> staticcss(selector: string) : Predicate<DebugEleme

find_by! find_by!(*args) Instance Public methods Like find_by, except that if no record is found, raises an ActiveRecord::RecordNotFound error.

sort_by enum.sort_by { |obj| block } â arrayenum.sort_by â an_enumerator Instance Public methods Sorts enum using a set of