Module: javajava::util::Map

Includes:
JactiveSupport::JavaExtensions::Map::Hash
Defined in:
lib/jactive_support/core_ext/to_java_map.rb,
lib/jactive_support/json/encoders/map.rb,
lib/jactive_support/java_ext/map.rb

Overview

:nodoc:

Instance Method Summary collapse

Methods included from JactiveSupport::JavaExtensions::Map::Hash

#[], #[]=, #contains_key?, #contains_value?, #delete, #delete_if, #dup, #each, #each_key, #each_pair, #each_value, #fetch, included, #index, #invert, #keys, #length, #merge, #merge!, #reject, #reject!, #replace, #to_hash, #values_at

Instance Method Details

#as_json(options = nil) ⇒ Object

:nodoc:



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# File 'lib/jactive_support/json/encoders/map.rb', line 42

def as_json(options = nil) #:nodoc:
  if options
    if attrs = options[:except]
      except(*Array.wrap(attrs))
    elsif attrs = options[:only]
      slice(*Array.wrap(attrs))
    else
      self
    end
  else
    self
  end
end

#to_java_map ⇒ Object 



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# File 'lib/jactive_support/core_ext/to_java_map.rb', line 8

def to_java_map
  self
end

#to_json(options = {}) ⇒ Object

Returns a JSON string representing the hash.

Without any options, the returned JSON string will include all the hash keys. For example:

{ :name => "Konata Izumi", 'age' => 16, 1 => 2 }.to_json
# => {"name": "Konata Izumi", 1: 2, "age": 16}

The keys in the JSON string are unordered due to the nature of hashes.

The :only and :except options can be used to limit the attributes included, and will accept 1 or more hash keys to include/exclude.

{ :name => "Konata Izumi", 'age' => 16, 1 => 2 }.to_json(:only => [:name, 'age'])
# => {"name": "Konata Izumi", "age": 16}

{ :name => "Konata Izumi", 'age' => 16, 1 => 2 }.to_json(:except => 1)
# => {"name": "Konata Izumi", "age": 16}

The options also filter down to any hash values. This is particularly useful for converting hashes containing ActiveRecord objects or any object that responds to options in their to_json method. For example:

users = User.find(:all)
{ :users => users, :count => users.size }.to_json(:include => :posts)

would pass the :include => :posts option to users, allowing the posts association in the User model to be converted to JSON as well.



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# File 'lib/jactive_support/json/encoders/map.rb', line 31

def to_json(options = {}) #:nodoc:
  hash = as_json(options)
  return ActiveSupport::JSON.encode(hash, options) if hash != self

  result = '{'
  result << hash.map do |key, value|
    "#{ActiveSupport::JSON.encode(key.to_s)}:#{ActiveSupport::JSON.encode(value, options)}"
  end * ','
  result << '}'
end