Class: Hash

Inherits:
Object show all
Defined in:
lib/core_ext/hash.rb,
lib/core_ext/blank.rb

Overview

reopening Hash class

Instance Method Summary collapse

Instance Method Details

#reverse_merge(other_hash) ⇒ Object

Merges the caller into other_hash. For example,

options = options.reverse_merge(size: 25, velocity: 10)

is equivalent to

options = { size: 25, velocity: 10 }.merge(options)

This is particularly useful for initializing an options hash with default values.



30
31
32
 
# File 'lib/core_ext/hash.rb', line 30

def reverse_merge(other_hash)
  other_hash.merge(self)
end

#reverse_merge!(other_hash) ⇒ Object Also known as: reverse_update

Destructive reverse_merge.



38
39
40
41
 
# File 'lib/core_ext/hash.rb', line 38

def reverse_merge!(other_hash)
  # right wins if there is no left
  merge!(other_hash) { |_key, left, _right| left }
end

#to_html_attributes(empties = nil) ⇒ Object 



7
8
9
10
11
12
13
14
15
16
 
# File 'lib/core_ext/hash.rb', line 7

def to_html_attributes(empties = nil)
  hash = self.dup
  hash.reject! { |_k, v| v.blank? } unless empties.nil?
  out = ''
  hash.keys.sort.each do |key|  # NB!! sorting output order of attributes alphabetically
    val = hash[key].is_a?(Array) ? hash[key].join('_') : hash[key].to_s
    out << "#{key}=\"#{val}\" "
  end
  out.strip
end