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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
if options[:except]
hash_keys = hash_keys - Array(options[:except])
elsif options[:only]
hash_keys = hash_keys & Array(options[:only])
end
returning result = '{' do
result << hash_keys.map do |key|
"#{ActiveSupport::JSON.encode(key)}: #{ActiveSupport::JSON.encode(self[key], options)}"
end * ', '
result << '}'
end
end
end
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