JBuilder and RABL Syntax Comparison

jbuilder.rb

Jbuilder.encode do |json|
  json.content format_content(@message.content)
  json.(@message, :created_at, :updated_at)

  json.author do |json|
    json.name @message.creator.name.familiar
    json.email_address @message.creator.email_address_with_name
    json.url url_for(@message.creator, format: :json)
  end

  if current_user.admin?
    json.visitors calculate_visitors(@message)
  end

  json.comments @message.comments, :content, :created_at

  json.attachments @message.attachments do |json, attachment|
    json.filename attachment.filename
    json.url url_for(attachment)
  end
end

json_builder.rb

content format_content(@message.content)
created_at @message.created_at
updated_at @message.updated_at

author do
  name @message.creator.name.familiar
  email_address @message.creator.email_address_with_name
  url url_for(@message.creator, format: :json)
end

if current_user.admin?
  visitors calculate_visitors(@message)
end

comments @message.comments do |comment|
  content comment.content
  created_at comment.created_at
end

attachments @message.attachments do |attachment|
  filename attachment.filename
  url url_for(attachment)
end

rabl.rb

object @message

node(:content) { format_content(@message.content) }
attributes :created_at, :updated_at

child @message.creator => :author do
  node(:name) { |a| a.name.familiar }
  node(:email_address) { |a| a.email_address_with_name }
  node(:url) { |a| url_for(a, format: :json) }
end

if current_user.admin?
  node(:visitors) { calculate_visitors(@message) } 
end

child :comments do
  attributes :content, :created_at
end

child :attachments do
  attributes :filename
  node(:url) { url_for(attachment) }
end

result.json

{ 
  "content": "<p>This is <i>serious</i> monkey business",
  "created_at": "2011-10-29T20:45:28-05:00",
  "updated_at": "2011-10-29T20:45:28-05:00",

  "author": {
    "name": "David H.",
    "email_address": "'David Heinemeier Hansson' <david@heinemeierhansson.com>",
    "url": "http://example.com/users/1-david.json"
  },

  "visitors": 15,

  "comments": [
    { "content": "Hello everyone!", "created_at": "2011-10-29T20:45:28-05:00" },
    { "content": "To you my good sir!", "created_at": "2011-10-29T20:47:28-05:00" }
  ],

  "attachment": [
    { "filename": "forecast.xls", "url": "http://example.com/downloads/forecast.xls" },
    { "filename": "presentation.pdf", "url": "http://example.com/downloads/presentation.pdf" }
  ]
}