Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/indifference/hash.rb,
lib/indifference/hash_keys.rb,
lib/indifference/hash_reverse_merge.rb

Direct Known Subclasses

Indifference::HashWithIndifferentAccess

Instance Method Summary collapse

Instance Method Details

#assert_valid_keys(*valid_keys) ⇒ Object

Validates all keys in a hash match *valid_keys, raising ArgumentError on a mismatch.

Note that keys are treated differently than HashWithIndifferentAccess, meaning that string and symbol keys will not match.

{ name: 'Rob', years: '28' }.assert_valid_keys(:name, :age) # => raises "ArgumentError: Unknown key: :years. Valid keys are: :name, :age"
{ name: 'Rob', age: '28' }.assert_valid_keys('name', 'age') # => raises "ArgumentError: Unknown key: :name. Valid keys are: 'name', 'age'"
{ name: 'Rob', age: '28' }.assert_valid_keys(:name, :age)   # => passes, raises nothing



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# File 'lib/indifference/hash_keys.rb', line 75

def assert_valid_keys(*valid_keys)
  valid_keys.flatten!
  each_key do |k|
    unless valid_keys.include?(k)
      raise ArgumentError.new("Unknown key: #{k.inspect}. Valid keys are: #{valid_keys.map(&:inspect).join(', ')}")
    end
  end
end

#deep_stringify_keys ⇒ Object

Returns a new hash with all keys converted to strings. This includes the keys from the root hash and from all nested hashes and arrays.

hash = { person: { name: 'Rob', age: '28' } }

hash.deep_stringify_keys
# => {"person"=>{"name"=>"Rob", "age"=>"28"}}



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# File 'lib/indifference/hash_keys.rb', line 111

def deep_stringify_keys
  deep_transform_keys(&:to_s)
end

#deep_stringify_keys! ⇒ Object

Destructively converts all keys to strings. This includes the keys from the root hash and from all nested hashes and arrays.



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# File 'lib/indifference/hash_keys.rb', line 118

def deep_stringify_keys!
  deep_transform_keys!(&:to_s)
end

#deep_symbolize_keys ⇒ Object

Returns a new hash with all keys converted to symbols, as long as they respond to to_sym. This includes the keys from the root hash and from all nested hashes and arrays.

hash = { 'person' => { 'name' => 'Rob', 'age' => '28' } }

hash.deep_symbolize_keys
# => {:person=>{:name=>"Rob", :age=>"28"}}



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# File 'lib/indifference/hash_keys.rb', line 130

def deep_symbolize_keys
  deep_transform_keys{ |key| key.to_sym rescue key }
end

#deep_symbolize_keys! ⇒ Object

Destructively converts all keys to symbols, as long as they respond to to_sym. This includes the keys from the root hash and from all nested hashes and arrays.



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# File 'lib/indifference/hash_keys.rb', line 137

def deep_symbolize_keys!
  deep_transform_keys!{ |key| key.to_sym rescue key }
end

#deep_transform_keys(&block) ⇒ Object

Returns a new hash with all keys converted by the block operation. This includes the keys from the root hash and from all nested hashes and arrays.

hash = { person: { name: 'Rob', age: '28' } }

hash.deep_transform_keys{ |key| key.to_s.upcase }
# => {"PERSON"=>{"NAME"=>"Rob", "AGE"=>"28"}}



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# File 'lib/indifference/hash_keys.rb', line 92

def deep_transform_keys(&block)
  _deep_transform_keys_in_object(self, &block)
end

#deep_transform_keys!(&block) ⇒ Object

Destructively converts all keys by using the block operation. This includes the keys from the root hash and from all nested hashes and arrays.



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# File 'lib/indifference/hash_keys.rb', line 99

def deep_transform_keys!(&block)
  _deep_transform_keys_in_object!(self, &block)
end

#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.



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# File 'lib/indifference/hash_reverse_merge.rb', line 12

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

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

Destructive reverse_merge.



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# File 'lib/indifference/hash_reverse_merge.rb', line 17

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

#stringify_keys ⇒ Object

Returns a new hash with all keys converted to strings.

hash = { name: 'Rob', age: '28' }

hash.stringify_keys
# => {"name"=>"Rob", "age"=>"28"}



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# File 'lib/indifference/hash_keys.rb', line 37

def stringify_keys
  transform_keys(&:to_s)
end

#stringify_keys! ⇒ Object

Destructively converts all keys to strings. Same as stringify_keys, but modifies self.



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# File 'lib/indifference/hash_keys.rb', line 43

def stringify_keys!
  transform_keys!(&:to_s)
end

#symbolize_keys ⇒ Object Also known as: to_options

Returns a new hash with all keys converted to symbols, as long as they respond to to_sym.

hash = { 'name' => 'Rob', 'age' => '28' }

hash.symbolize_keys
# => {:name=>"Rob", :age=>"28"}



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# File 'lib/indifference/hash_keys.rb', line 54

def symbolize_keys
  transform_keys{ |key| key.to_sym rescue key }
end

#symbolize_keys! ⇒ Object Also known as: to_options!

Destructively converts all keys to symbols, as long as they respond to to_sym. Same as symbolize_keys, but modifies self.



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# File 'lib/indifference/hash_keys.rb', line 61

def symbolize_keys!
  transform_keys!{ |key| key.to_sym rescue key }
end

#transform_keys ⇒ Object

Returns a new hash with all keys converted using the block operation.

hash = { name: 'Rob', age: '28' }

hash.transform_keys { |key| key.to_s.upcase } # => {"NAME"=>"Rob", "AGE"=>"28"}

If you do not provide a block, it will return an Enumerator for chaining with other methods:

hash.transform_keys.with_index { |k, i| [k, i].join } # => {"name0"=>"Rob", "age1"=>"28"}



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# File 'lib/indifference/hash_keys.rb', line 12

def transform_keys
  return enum_for(:transform_keys) { size } unless block_given?
  result = {}
  each_key do |key|
    result[yield(key)] = self[key]
  end
  result
end

#transform_keys! ⇒ Object

Destructively converts all keys using the block operations. Same as transform_keys but modifies self.



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# File 'lib/indifference/hash_keys.rb', line 23

def transform_keys!
  return enum_for(:transform_keys!) { size } unless block_given?
  keys.each do |key|
    self[yield(key)] = delete(key)
  end
  self
end

#with_indifferent_access ⇒ Object Also known as: nested_under_indifferent_access

Returns an Indifference::HashWithIndifferentAccess out of its receiver:

{ a: 1 }.with_indifferent_access['a'] # => 1



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# File 'lib/indifference/hash.rb', line 8

def with_indifferent_access
  Indifference::HashWithIndifferentAccess.new(self)
end