Class: Hash

Inherits:
Object show all
Defined in:
lib/core_ext/hash/slice.rb,
lib/core_ext/hash/iterate_nested.rb,
lib/core_ext/hash/symbolize_keys.rb,
lib/core_ext/hash/sorted_yaml_style.rb

Overview

from activesupport

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#to_yaml_style ⇒ Object

Returns the value of attribute to_yaml_style.



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# File 'lib/core_ext/hash/sorted_yaml_style.rb', line 2

def to_yaml_style
  @to_yaml_style
end

Instance Method Details

#delete_nested_if(data = self, keys = [], &block) ⇒ Object 



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# File 'lib/core_ext/hash/iterate_nested.rb', line 26

def delete_nested_if(data = self, keys = [], &block)
  data.each do |key, value|
    if yield(keys + [key], value)
      data.delete(key)
    else
      delete_nested_if(value, keys + [key], &block)
    end
  end if data.is_a?(Hash)
end

#each_nested(data = nil, keys = [], &block) ⇒ Object 



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# File 'lib/core_ext/hash/iterate_nested.rb', line 2

def each_nested(data = nil, keys = [], &block)
  (data || self).each do |key, value|
    case value
    when Hash
      each_nested(value, keys + [key], &block)
    else
      yield(keys + [key], value)
    end
  end
end

#select_nested(data = self, keys = [], &block) ⇒ Object 



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# File 'lib/core_ext/hash/iterate_nested.rb', line 13

def select_nested(data = self, keys = [], &block)
  case data
  when Hash
    data.inject({}) do |result, (key, value)|
      value = select_nested(value, keys + [key], &block)
      result[key] = value unless value.nil? || value.empty?
      result
    end
  else
    data if yield(keys, data)
  end
end

#set_yaml_style(style) ⇒ Object 



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# File 'lib/core_ext/hash/sorted_yaml_style.rb', line 4

def set_yaml_style(style)
  self.to_yaml_style = style
  each { |key, value| value.set_yaml_style(style) if value.is_a?(Hash) }
end

#slice(*keys) ⇒ Object

Returns a new hash with only the given keys.



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# File 'lib/core_ext/hash/slice.rb', line 5

def slice(*keys)
  hash = self.class.new
  keys.each { |k| hash[k] = self[k] if has_key?(k) }
  hash
end

#slice!(*keys) ⇒ Object

Replaces the hash with only the given keys. Returns a hash contained the removed key/value pairs

{:a => 1, :b => 2, :c => 3, :d => 4}.slice!(:a, :b) # => {:c => 3, :d =>4}



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# File 'lib/core_ext/hash/slice.rb', line 14

def slice!(*keys)
  omit = slice(*self.keys - keys)
  hash = slice(*keys)
  replace(hash)
  omit
end

#symbolize_keys ⇒ Object

Return a new hash with all keys converted to symbols.



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# File 'lib/core_ext/hash/symbolize_keys.rb', line 3

def symbolize_keys
  inject({}) do |options, (key, value)|
    options[(key.to_sym rescue key) || key] = value
    options
  end
end

#symbolize_keys! ⇒ Object

Destructively convert all keys to symbols.



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# File 'lib/core_ext/hash/symbolize_keys.rb', line 11

def symbolize_keys!
  self.replace(self.symbolize_keys)
end

#to_yaml(opts = {}) ⇒ Object 



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# File 'lib/core_ext/hash/sorted_yaml_style.rb', line 9

def to_yaml(opts = {})
  YAML::quick_emit(object_id, opts) do |out|
    out.map(taguri, to_yaml_style) do |map|
      elements = to_yaml_style == :sorted ? sort : self
      elements.each { |k, v| map.add(k, v) }
    end
  end
end