class RuboCop::Cop::Rails::IndexWith

This cop looks for uses of `each_with_object({}) { … }`, `map { … }.to_h`, and `Hash[map { … }]` that are transforming an enumerable into a hash where the keys are the original elements. Rails provides the `index_with` method for this purpose.

@example

# bad
[1, 2, 3].each_with_object({}) { |el, h| h[el] = foo(el) }
[1, 2, 3].to_h { |el| [el, foo(el)] }
[1, 2, 3].map { |el| [el, foo(el)] }.to_h
Hash[[1, 2, 3].collect { |el| [el, foo(el)] }]

# good
[1, 2, 3].index_with { |el| foo(el) }

Private Instance Methods

new_method_name() click to toggle source
# File lib/rubocop/cop/rails/index_with.rb, line 62
def new_method_name
  'index_with'
end