method

index_with

v7.1.3.2 - Show latest stable - 0 notes - Class: Enumerable

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What's this?

index_with(default = (no_default = true)) public

Convert an enumerable to a hash, using the element as the key and the block result as the value.

post = Post.new(title: "hey there", body: "what's up?")

%i( title body ).index_with { |attr_name| post.public_send(attr_name) }
# => { title: "hey there", body: "what's up?" }

If an argument is passed instead of a block, it will be used as the value for all elements:

%i( created_at updated_at ).index_with(Time.now)
# => { created_at: 2020-03-09 22:31:47, updated_at: 2020-03-09 22:31:47 }

Show source

# File activesupport/lib/active_support/core_ext/enumerable.rb, line 75
  def index_with(default = (no_default = true))
    if block_given?
      result = {}
      each { |elem| result[elem] = yield(elem) }
      result
    elsif no_default
      to_enum(:index_with) { size if respond_to?(:size) }
    else
      result = {}
      each { |elem| result[elem] = default }
      result
    end
  end

index_with

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