Class: RuboCop::Cop::Rails::IndexWith

Inherits:

RuboCop::Cop

• Object
• RuboCop::Cop
• RuboCop::Cop::Rails::IndexWith

Extended by:

TargetRailsVersion

Includes:

IndexMethod

Defined in:

lib/rubocop/cop/rails/index_with.rb

Overview

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.

Examples:

# bad
[1, 2, 3].each_with_object({}) { |el, h| h[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) }

Method Summary

Methods included from TargetRailsVersion

minimum_target_rails_version, support_target_rails_version?

Methods included from IndexMethod

#autocorrect, #on_block, #on_csend, #on_send