Class: DbAgile::Tools::OrderedHash

Inherits:
Object
  • Object
show all
Defined in:
lib/dbagile/tools/ordered_hash.rb

Instance Method Summary collapse

Constructor Details

#initialize(hash = {}) ⇒ OrderedHash

Decorates a hash as an ordered hash



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# File 'lib/dbagile/tools/ordered_hash.rb', line 6

def initialize(hash = {})
  @hash = hash
  @keys = hash.keys
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object

Delegated to hash



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# File 'lib/dbagile/tools/ordered_hash.rb', line 12

def method_missing(name, *args, &block)
  @hash.send(name, *args, &block)
  @keys = (@keys & @hash.keys)
end

Instance Method Details

#[]=(name, value) ⇒ Object

Sets a (name,value) pair



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# File 'lib/dbagile/tools/ordered_hash.rb', line 18

def []=(name, value)
  @hash[name] = value
  unless @keys.include?(name)
    @keys << name
  end
  value
end

#to_yaml(opts = {}) ⇒ Object

Puts as YAML, maintaining order



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# File 'lib/dbagile/tools/ordered_hash.rb', line 27

def to_yaml(opts = {})
  YAML::quick_emit(self, opts){|out|
    out.map("tag:yaml.org,2002:map") do |map|
      @keys.each{|key|
        map.add(key.to_s, @hash[key])
      }
    end
  }
end