instance method `update`

Ruby on Rails 4.2.9

Since v2.2.3 Last seen in v4.2.9

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9

Compare with:

update(other_hash)

Updates the receiver in-place, merging in the hash passed as argument:

hash_1 = ActiveSupport::HashWithIndifferentAccess.new
hash_1[:key] = 'value'

hash_2 = ActiveSupport::HashWithIndifferentAccess.new
hash_2[:key] = 'New Value!'

hash_1.update(hash_2) # => {"key"=>"New Value!"}

The argument can be either an ActiveSupport::HashWithIndifferentAccess or a regular Hash. In either case the merge respects the semantics of indifferent access.

If the argument is a regular hash with keys :key and +“key”+ only one of the values end up in the receiver, but which one is unspecified.

When given a block, the value for duplicated keys will be determined by the result of invoking the block with the duplicated key, the value in the receiver, and the value in other_hash. The rules for duplicated keys follow the semantics of indifferent access:

hash_1[:key] = 10
hash_2['key'] = 12
hash_1.update(hash_2) { |key, old, new| old + new } # => {"key"=>22}

Parameters

other_hash req

Source

# File activesupport/lib/active_support/hash_with_indifferent_access.rb, line 127
    def update(other_hash)
      if other_hash.is_a? HashWithIndifferentAccess
        super(other_hash)
      else
        other_hash.to_hash.each_pair do |key, value|
          if block_given? && key?(key)
            value = yield(convert_key(key), self[key], value)
          end
          regular_writer(convert_key(key), convert_value(value))
        end
        self
      end
    end

Defined in activesupport/lib/active_support/hash_with_indifferent_access.rb line 127 · View on GitHub · Improve this page · Find usages on GitHub

Defined in HashWithIndifferentAccess

Signature

Parameters