From 7c3581cba243aa17a9f002b40c5f017d8e968492 Mon Sep 17 00:00:00 2001
From: Jeremy Kemper <jeremy@bitsweat.net>
Date: Wed, 24 Oct 2007 16:21:46 +0000
Subject: Document Enumerable and Hash #to_json. Add test for hash with integer
 key. Closes #9970.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8010 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../lib/active_support/json/encoders/hash.rb       | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'activesupport/lib/active_support/json/encoders/hash.rb')

diff --git a/activesupport/lib/active_support/json/encoders/hash.rb b/activesupport/lib/active_support/json/encoders/hash.rb
index 14b91a76a1..774803d64f 100644
--- a/activesupport/lib/active_support/json/encoders/hash.rb
+++ b/activesupport/lib/active_support/json/encoders/hash.rb
@@ -1,4 +1,36 @@
 class Hash
+  # 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 <tt>:only</tt> and <tt>:except</tt> 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 <tt>to_json</tt> method. For example:
+  #
+  #   users = User.find(:all)
+  #   { :users => users, :count => users.size }.to_json(:include => :posts)
+  #
+  # would pass the <tt>:include => :posts</tt> option to <tt>users</tt>,
+  # allowing the posts association in the User model to be converted to JSON
+  # as well.
   def to_json(options = {}) #:nodoc:
     hash_keys = self.keys
 
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