Module: Buff::Extensions::Hash::DottedPaths::ClassMethods

Defined in:
lib/buff/extensions/hash/dotted_paths.rb

Instance Method Summary collapse

Instance Method Details

#from_dotted_path(dotpath, seed = nil, target = self.new) ⇒ Hash

Create a new Hash containing other nested Hashes from a string containing a dotted path. A Hash will be created and assigned to a key of another Hash for each entry in the dotted path.

If a value is provided for the optional seed argument then the value of the deepest nested key will be set to the given value. If no value is provided the value of the key will be nil.

Examples:

creating a nested hash from a dotted path


Hash.from_dotted_path("deep.nested.hash") =>
{
  "deep" => {
    "nested" => {
      "hash" => nil
    }
  }
}

specifying a seed value


Hash.from_dotted_path("deep.nested.hash", :seed_value) =>
{
  "deep" => {
    "nested" => {
      "hash" => :seed_value
    }
  }
}

Parameters:

  • dotpath (String, Symbol, Array)
  • seed (Object) (defaults to: nil) —

    (nil)

  • target (Hash) (defaults to: self.new) —

    (self.new)

Returns:



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# File 'lib/buff/extensions/hash/dotted_paths.rb', line 47

def from_dotted_path(dotpath, seed = nil, target = self.new)
  case dotpath
  when String, Symbol
    from_dotted_path(dotpath.to_s.split("."), seed)
  when Array
    if dotpath.empty?
      return target
    end

    key = dotpath.pop

    if target.empty?
      target[key] = seed
      from_dotted_path(dotpath, seed, target)
    else
      new_target      = self.new
      new_target[key] = target
      from_dotted_path(dotpath, seed, new_target)
    end
  end
end