class RuboCop::Cop::Style::MapToHash

Looks for uses of `map.to_h` or `collect.to_h` that could be written with just `to_h` in Ruby >= 2.6.

NOTE: `Style/HashTransformKeys` and `Style/HashTransformValues` will also change this pattern if only hash keys or hash values are being transformed.

@safety

This cop is unsafe, as it can produce false positives if the receiver
is not an `Enumerable`.

@example

# bad
something.map { |v| [v, v * 2] }.to_h

# good
something.to_h { |v| [v, v * 2] }

# bad
{foo: bar}.collect { |k, v| [k.to_s, v.do_something] }.to_h

# good
{foo: bar}.to_h { |k, v| [k.to_s, v.do_something] }

Constants

MSG
RESTRICT_ON_SEND

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/style/map_to_hash.rb, line 45
def on_send(node)
  return unless (to_h_node, map_node = map_to_h?(node))

  message = format(MSG, method: map_node.loc.selector.source)
  add_offense(map_node.loc.selector, message: message) do |corrector|
    # If the `to_h` call already has a block, do not autocorrect.
    next if to_h_node.block_node

    autocorrect(corrector, to_h_node, map_node)
  end
end

Private Instance Methods

autocorrect(corrector, to_h, map) click to toggle source
# File lib/rubocop/cop/style/map_to_hash.rb, line 59
def autocorrect(corrector, to_h, map)
  removal_range = range_between(to_h.loc.dot.begin_pos, to_h.loc.selector.end_pos)

  corrector.remove(range_with_surrounding_space(removal_range, side: :left))
  corrector.replace(map.loc.selector, 'to_h')
end