Merge branch 'master' into xml-renderer

.gitignore

@@ -1,7 +1,10 @@
-.bundle/
+## General
-log/*.log
+log
-pkg/
+doc
-test/dummy/db/*.sqlite3
+rdoc
-test/dummy/log/*.log
+
-test/dummy/tmp/
+## Bundler
-test/dummy/.sass-cache
+.bundle
+pkg
+Gemfile.lock
+

CHANGELOG.md

@@ -0,0 +1,24 @@
+# CHANGELOG
+
+## 0.2.0 (unrelased)
+  * Default template to render with responder can be set per controller
+  * Reponder works out of the box with devise
+  * object or collection can be skipped if use with `respond_to` blocks
+
+## 0.1.3
+  * Render correcly when variables are not passed via the assigns ivar but as helper methods
+    (decent_exposure, focused_controller)
+  * Add custom Responder
+
+## 0.1.2
+  * Add RablRails#render method (see README or source code)
+  * Fix fail when JSON engine is not found. Now fallback to MultiJson.default_adapter
+  * Warning message printed on logger when JSON engine fail to load
+
+## 0.1.1
+
+  * Add CHANGELOG
+  * Remove unnused test in loop
+  * Speed up rendering by not double copying variable from context
+  * Rename private variable to avoid name conflict
+  * Remove sqlite3 development dependency

Gemfile

@@ -1,18 +1,9 @@
 source "http://rubygems.org"
 
-# Declare your gem's dependencies in rabl-rails.gemspec.
-# Bundler will treat runtime dependencies like base dependencies, and
-# development dependencies will be added by default to the :development group.
 gemspec
 
-# jquery-rails is used by the dummy application
+gem 'yajl-ruby'
 
-gem 'rspec-mocks'
+group :test do
-
+  gem 'rspec-mocks'
-# Declare any dependencies that are still in development here instead of in
+end
-# your gemspec. These might include edge Rails or gems from your path or
-# Git. Remember to move these dependencies to your gemspec before releasing
-# your gem to rubygems.org.
-
-# To use debugger
-# gem 'ruby-debug19', :require => 'ruby-debug'

Gemfile.lock

@@ -1,67 +0,0 @@
-PATH
-  remote: .
-  specs:
-    rabl-rails (0.1.0)
-      activesupport (~> 3.2.1)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    actionpack (3.2.1)
-      activemodel (= 3.2.1)
-      activesupport (= 3.2.1)
-      builder (~> 3.0.0)
-      erubis (~> 2.7.0)
-      journey (~> 1.0.1)
-      rack (~> 1.4.0)
-      rack-cache (~> 1.1)
-      rack-test (~> 0.6.1)
-      sprockets (~> 2.1.2)
-    activemodel (3.2.1)
-      activesupport (= 3.2.1)
-      builder (~> 3.0.0)
-    activesupport (3.2.1)
-      i18n (~> 0.6)
-      multi_json (~> 1.0)
-    builder (3.0.0)
-    erubis (2.7.0)
-    hike (1.2.1)
-    i18n (0.6.0)
-    journey (1.0.3)
-    json (1.6.5)
-    multi_json (1.1.0)
-    rack (1.4.1)
-    rack-cache (1.1)
-      rack (>= 0.4)
-    rack-ssl (1.3.2)
-      rack
-    rack-test (0.6.1)
-      rack (>= 1.0)
-    railties (3.2.1)
-      actionpack (= 3.2.1)
-      activesupport (= 3.2.1)
-      rack-ssl (~> 1.3.2)
-      rake (>= 0.8.7)
-      rdoc (~> 3.4)
-      thor (~> 0.14.6)
-    rake (0.9.2.2)
-    rdoc (3.12)
-      json (~> 1.4)
-    rspec-mocks (2.8.0)
-    sprockets (2.1.2)
-      hike (~> 1.2)
-      rack (~> 1.0)
-      tilt (~> 1.1, != 1.3.0)
-    sqlite3 (1.3.5)
-    thor (0.14.6)
-    tilt (1.3.3)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  actionpack (~> 3.2.1)
-  rabl-rails!
-  railties (~> 3.2.1)
-  rspec-mocks
-  sqlite3

MIT-LICENSE

@@ -1,4 +1,4 @@
-Copyright 2012 YOURNAME
+Copyright 2012 Christopher Cocchi-Perrier
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

README.md

@@ -4,7 +4,7 @@ RABL (Ruby API Builder Language) is a ruby templating system for rendering resou
 
 RABL-rails only target Rails 3+ application because Rails 2 applications are becoming less and less present and will be obsolete with Rails 4. So let's look to the future !
 
-So now you ask why used `rabl-rails` if `rabl` already exists and supports Rails. Rabl-rails is *faster* and uses * less memory* than standard rabl gem while letting you access same features. Of course, there are some slight changes to do on your templates to get this gem to work but it should't take you more than 5 minutes.
+So now you ask why used `rabl-rails` if `rabl` already exists and supports Rails. Rabl-rails is **faster** and uses **less memory** than standard rabl gem while letting you access same features. Of course, there are some slight changes to do on your templates to get this gem to work but it should't take you more than 5 minutes.
 
 ## Installation
 
@@ -17,7 +17,7 @@ gem install rabl-rails
 or add directly to your `Gemfile`
 
 ```
-gem 'rabl'
+gem 'rabl-rails'
 ```
 
 And that's it !
@@ -29,12 +29,12 @@ assuming you have a `Post` model filled with blog posts, and a `PostController`
 
 ```ruby
 class PostController < ApplicationController
-	respond_to :html, :json, :xml
+  respond_to :html, :json, :xml
 
-	def index
+  def index
-		@posts = Post.order('created_at DESC')
+	  @posts = Post.order('created_at DESC')
-		respond_with(@posts)
+	  respond_with(@posts)
-	end
+  end
 end
 ```
 
@@ -64,21 +64,209 @@ That's a basic overview but there is a lot more to see such as partials, inherit
 
 As opposed to standard RABL gem, this gem separate compiling (a.k.a transforming a RABL-rails template into a Ruby hash) and the actual rendering of the object or collection. This allow to only compile the template once and only Ruby hashes.
 
-The fact of compiling the template outside of any rendering context prevent us to use any instances variables (with the exception of node) in the template because they are rendering objects. So instead, you'll have to use symbols of these variables. For example, to render the collection `@posts` inside your `PostController`, you need to use `:@posts` inside of the template.
+The fact of compiling the template outside of any rendering context prevent us to use any instances variables (with the exception of node) in the template because they are rendering objects. So instead, you'll have to use symbols of these variables.For example, to render the collection `@posts` inside your `PostController`, you need to use `:@posts` inside of the template.
 
 The only places where you can actually used instance variables  are into Proc (or lambda) or into custom node (because they are treated as Proc).
 
 ```ruby
-	# We reference the @posts varibles that will be used at rendering time
+# We reference the @posts varibles that will be used at rendering time
-	collection :@posts
+collection :@posts
 	
-	# Here you can use directly the instance variable because it
+# Here you can use directly the instance variable because it
-	# will be evaluated when rendering the object 
+# will be evaluated when rendering the object 
-	node(:read) { |post| post.read_by?(@user) }
+node(:read) { |post| post.read_by?(@user) }
 ```
 
 The same rule applies for view helpers such as `current_user`
 
 After the template is compiled into a hash, Rabl-rails will use a renderer to do the actual output. Actually, only JSON and XML formats are supported.
 
+## Configuration
+
+RablRails works out of the box, with default options and fastest engine available (yajl, libxml). But depending on your needs, you might want to change that or how your output looks like. You can set global configuration in your application:
+
+```ruby
+  # config/initializers/rabl_rails.rb
+  RablRails.configure do |config|
+    # These are the default
+    # config.cache_templates = true
+    # config.include_json_root = true
+    # config.json_engine = :yajl
+  end
+```
+
 ## Usage
+
+### Data declaration
+
+To declare data to use in the template, you can use either `object` or `collection` with the symbol name or your data.
+
+```ruby
+# app/views/users/show.json.rabl
+object :@user
+
+# app/views/users/index.json.rabl
+collection :@users
+```
+
+You can specify root label for the collection using hash or `:root` option
+
+```ruby
+collection :@posts, root: :articles
+#is equivalent to
+collection :@posts => :articles
+
+# => { "articles" : [{...}, {...}] }
+```
+
+There are rares cases when the template doesn't map directly to any object. In these cases, you can set data to false or skip data declaration altogether.
+
+```ruby
+object false
+node(:some_count) { |_| @user.posts.count }
+child(:@user) { attribute :name }
+```
+
+### Attributes / Methods
+
+Basic usage is to declared attributes to include in the response. These can be database attributes or any instance method.
+
+```ruby
+attributes :id, :title, :to_s
+```
+
+You can aliases these attributes in your response
+
+```ruby
+attributes title: :foo, to_s: :bar
+# => { "foo" : <title value>, "bar" : <to_s value> } 
+```
+
+### Child nodes
+
+You can include nested information from data associated with the parent model. You can also alias these associations.
+For example if you have a `Post` model that belongs to a `User`
+
+```ruby
+object :@post
+child(user: :author) do
+	attributes :name
+end
+# => { "post" : { "author" : { "name" : "John D." } } }
+```
+
+You can also use arbitrary data source with child nodes
+```ruby
+child(:@users) do
+	attributes :id, :name
+end
+```
+
+### Custom nodes
+
+You can create custom node in your response, based on the result of the given block
+
+```ruby
+object :@user
+node(:full_name) { |u| u.first_name + " " + u.last_name }
+# => { "user" : { "full_name" : "John Doe" } }
+```
+
+You can add the node only if a condition is true
+
+```ruby
+node(:email, if: -> { |u| u.valid_email? }) do |u| 
+	u.email
+end
+```
+
+Nodes are evaluated at the rendering time, so you can use any instance variables or view helpers inside them
+
+```ruby
+node(:url) { |post| post_url(post) }
+```
+
+Custom nodes are really usefull to create flexible representations of your resources.
+
+### Extends & Partials
+
+Often objects have a basic representation that is shared accross different views and enriched according to it. To avoid code redundancy you can extend your template from any other RABL template.
+
+```ruby
+# app/views/users/base.json.rabl
+attributes :id, :name
+
+# app/views/users/private.json.rabl
+extends 'users/base'
+attributes :super_secret_attribute
+```
+
+You can also extends template in child nodes using `partial` option (this is the same as using `extends` in the child block)
+
+```ruby
+collection @posts
+attribute :title
+child(:user, partial: 'users/base')
+```
+
+Partials can also be used inside custom nodes. When using partial this way, you MUST declare the object associated to the partial
+
+```ruby
+node(:location) do |user|
+	{ city: user.city, address: partial('users/address', object: m.address) }
+end
+```
+
+### Nesting
+
+Rabl allow you to define easily your templates, even with hierarchy of 2 or 3 levels. Let's suppose your have a `thread` model that has many `posts` and that each post has many `comments`. We can display a full thread in a few lines
+
+```ruby
+object :@thread
+attribute :caption
+child :posts do
+  attribute :title
+	child :comments do
+		extends 'comments/base'
+	end
+end
+```
+
+### Caching
+
+Caching is not a part of Rabl-rails. It is already in Rails itself, because caching all view output is the same as action caching (Rails caching is even better because it will also not run your queries).
+
+Moreover caching each object in a collection can be really not effective with big collections or simple objects. This is also a nightmare with cache expiration.
+
+### Render object directly
+
+There are cases when you want to render object outside Rails view context. For instance to render objects in the console or to create message queue payloads. For these situations, you can use `RablRails.render` as show below:
+
+```ruby
+Rabl.render(object, template, :view_path => 'app/views', :format => :json) #=> "{...}"
+```
+
+You can find more informations about how to use this method in the [wiki](http://github.com/ccocchi/rabl-rails/wiki/Render-object-directly) 
+
+## Performance
+
+Benchmarks have been made using this [application](http://github.com/ccocchi/rabl-benchmark), with rabl 0.6.14 and rabl-rails 0.1.0
+
+Overall, Rabl-rails is **20% faster and use 10% less memory**.
+
+You can see full tests on test application repository.
+
+## Authors and contributors
+
+* [Christopher Cocchi-Perrier](http://github.com/ccocchi) - Creator of the project
+
+Want to add another format to Rabl-rails ? Checkout [JSON renderer](http://github.com/ccocchi/rabl-rails/blob/master/lib/rabl-rails/renderers/json.rb) for reference
+Want to make another change ? Just fork and contribute, any help is very much appreciated
+
+## Original idea
+
+* [RABL](http://github.com/nesquena/rabl) Standart RABL gem. I used it a lot before deciding I wanted faster views
+
+## Copyright
+
+Copyright © 2011-2012 Christopher Cocchi-Perrier. See [MIT-LICENSE](http://github.com/ccocchi/rabl-rails/blob/master/MIT-LICENSE) for details.

lib/rabl-rails.rb

@@ -1,7 +1,6 @@
 require 'rails/railtie'
 
 require 'active_support'
-require 'active_support/json'
 require 'active_support/core_ext/class/attribute_accessors'
 
 require 'rabl-rails/version'
@@ -14,10 +13,12 @@ require 'rabl-rails/library'
 require 'rabl-rails/handler'
 require 'rabl-rails/railtie'
 
-
+require 'multi_json'
 
 module RablRails
-  extend self
+  extend Renderer
+
+  autoload :Responder, 'rabl-rails/responder'
 
   mattr_accessor :cache_templates
   @@cache_templates = true
@@ -25,11 +26,33 @@ module RablRails
   mattr_accessor :include_json_root
   @@include_json_root = true
 
-  def configure
+  mattr_reader :json_engine
+  @@json_engine = :yajl
+
+  mattr_accessor :use_custom_responder
+  @@use_custom_responder = false
+
+  mattr_accessor :responder_default_template
+  @@responder_default_template = 'show'
+
+  def self.configure
     yield self
+
+    ActionController::Base.responder = Responder if self.use_custom_responder
   end
 
-  def cache_templates?
+  def self.json_engine=(name)
+    MultiJson.engine = name
+    @@json_engine = name
+  rescue LoadError
+    Rails.logger.warn %Q(WARNING: rabl-rails could not load "#{self.json_engine}" as JSON engine, fallback to default)
+  end
+
+  def self.cache_templates?
     ActionController::Base.perform_caching && @@cache_templates
   end
+
+  def self.load_default_engines!
+    self.json_engine = :yajl
+  end
 end

lib/rabl-rails/compiler.rb

@@ -26,7 +26,7 @@ module RablRails
     #
     def object(data, options = {})
       @template.data, @template.root_name = extract_data_and_name(data)
-      @template.root_name = options[:root] if options[:root]
+      @template.root_name = options[:root] if options.has_key? :root
     end
     alias_method :collection, :object
 
@@ -60,7 +60,7 @@ module RablRails
     #
     def child(name_or_data, options = {})
       data, name = extract_data_and_name(name_or_data)
-      name = options[:root] if options[:root]
+      name = options[:root] if options.has_key? :root
       if options[:partial]
         template = Library.instance.compile_template_from_path(options[:partial])
         @template[name] = template.merge!(:_data => data)

lib/rabl-rails/handler.rb

@@ -7,7 +7,7 @@ module RablRails
       def self.call(template)
         %{
           RablRails::Library.instance.
-            get_rendered_template(#{template.source.inspect}, self)
+            get_rendered_template(#{template.source.inspect}, self, local_assigns)
         }
       end
     end

lib/rabl-rails/library.rb

@@ -8,14 +8,14 @@ module RablRails
       @cached_templates = {}
     end
 
-    def get_rendered_template(source, context)
+    def get_rendered_template(source, context, locals = nil)
       path = context.instance_variable_get(:@virtual_path)
       @lookup_context = context.lookup_context
 
       compiled_template = compile_template_from_source(source, path)
 
       format = context.params[:format] || 'json'
-      Renderers.const_get(format.upcase!).new(context).render(compiled_template)
+      Renderers.const_get(format.upcase!).new(context, locals).render(compiled_template)
     end
 
     def compile_template_from_source(source, path = nil)

lib/rabl-rails/railtie.rb

@@ -1,6 +1,8 @@
 module RablRails
   class Railtie < Rails::Railtie
     initializer "rabl.initialize" do |app|
+      RablRails.load_default_engines!
+      
       ActiveSupport.on_load(:action_view) do
         ActionView::Template.register_template_handler :rabl, RablRails::Handlers::Rabl
       end

lib/rabl-rails/renderer.rb

@@ -1,2 +1,89 @@
 require 'rabl-rails/renderers/base'
 require 'rabl-rails/renderers/json'
+
+module RablRails
+  module Renderer
+    class TemplateNotFound < StandardError; end
+
+    mattr_reader :view_path
+    @@view_path = 'app/views'
+
+    class LookupContext
+      T = Struct.new(:source)
+
+      def initialize(view_path, format)
+        @view_path = view_path || RablRails::Renderer.view_path
+        @format = format
+      end
+
+      #
+      # Manually find given rabl template file with given format.
+      # View path can be set via options, otherwise default Rails
+      # path is used
+      #
+      def find_template(name, opt, partial = false)
+        path = File.join(@view_path, "#{name}.#{@format}.rabl")
+        File.exists?(path) ? T.new(File.read(path)) : nil
+      end
+    end
+
+    #
+    # Context class to emulate normal Rails view
+    # context
+    #
+    class Context
+      attr_reader :format
+
+      def initialize(path, options)
+        @virtual_path = path
+        @format = options.delete(:format) || 'json'
+        @_assigns = {}
+        @options = options
+
+        options[:locals].each { |k, v| @_assigns[k.to_s] = v } if options[:locals]
+      end
+
+      def assigns
+        @_assigns
+      end
+
+      def params
+        { format: format }
+      end
+
+      def lookup_context
+        @lookup_context ||= LookupContext.new(@options[:view_path], format)
+      end
+    end
+
+    #
+    # Renders object with the given rabl template.
+    #
+    # Object can also be passed as an option :
+    # { locals: { object: obj_to_render } }
+    #
+    # Default render format is JSON, but can be changed via
+    # an option: { format: 'xml' }
+    #
+    # If template includes uses of instance variables (usually
+    # defined in the controller), you can passed them as locals
+    # options.
+    # For example, if you have this template:
+    #   object :@user
+    #   node(:read) { |u| u.has_read?(@post) }
+    #
+    # Your method call should look like this:
+    #   RablRails.render(user, 'users/show', locals: { post: Post.new })
+    #
+    def render(object, template, options = {})
+      object = options[:locals].delete(:object) if !object && options[:locals]
+
+      c = Context.new(template, options)
+      t = c.lookup_context.find_template(template, [], false)
+
+      raise TemplateNotFound unless t
+
+      Library.instance.get_rendered_template(t.source, c, resource: object)
+    end
+  end
+end

lib/rabl-rails/renderers/base.rb

@@ -3,11 +3,12 @@ module RablRails
     class PartialError < StandardError; end
 
     class Base
-      attr_accessor :options
+      attr_accessor :_options
 
-      def initialize(context) # :nodoc:
+      def initialize(context, locals = nil) # :nodoc:
         @_context = context
-        @options = {}
+        @_options = {}
+        @_resource = locals[:resource] if locals
         setup_render_context
       end
 
@@ -18,10 +19,17 @@ module RablRails
       # method defined by the renderer.
       #
       def render(template)
-        collection_or_resource = @_context.instance_variable_get(template.data) if template.data
+        collection_or_resource = if template.data
+          if @_context.respond_to?(template.data)
+            @_context.send(template.data)
+          else
+            instance_variable_get(template.data)
+          end
+        end
+        collection_or_resource ||= @_resource
         output_hash = collection_or_resource.respond_to?(:each) ? render_collection(collection_or_resource, template.source) :
           render_resource(collection_or_resource, template.source)
-        options[:root_name] = template.root_name
+        _options[:root_name] = template.root_name
         format_output(output_hash)
       end
 
@@ -54,7 +62,13 @@ module RablRails
           when Hash
             current_value = value.dup
             data_symbol = current_value.delete(:_data)
-            object = data_symbol.nil? ? data : data_symbol.to_s.start_with?('@') ? @_context.instance_variable_get(data_symbol) : data.send(data_symbol)
+            object = if data_symbol == nil
+              data
+            else
+              data_symbol.to_s.start_with?('@') ? instance_variable_get(data_symbol)
+                                                : data.respond_to?(data_symbol) ? data.send(data_symbol)
+                                                                                : send(data_symbol)
+            end
 
             if key.to_s.start_with?('_') # glue
               current_value.each_pair { |k, v|
@@ -108,7 +122,7 @@ module RablRails
       #
       def setup_render_context
         @_context.instance_variable_get(:@_assigns).each_pair { |k, v|
-          instance_variable_set("@#{k}", v) unless k.start_with?('_') || k == @data
+          instance_variable_set("@#{k}", v) unless k.start_with?('_')
         }
       end
     end

lib/rabl-rails/renderers/json.rb

@@ -2,8 +2,8 @@ module RablRails
   module Renderers
     class JSON < Base
       def format_output(hash)
-        hash = { options[:root_name] => hash } if options[:root_name] && RablRails.include_json_root
+        hash = { _options[:root_name] => hash } if _options[:root_name] && RablRails.include_json_root
-        ActiveSupport::JSON.encode(hash)
+        MultiJson.encode(hash)
       end
     end
   end

lib/rabl-rails/responder.rb

@@ -0,0 +1,27 @@
+module RablRails
+  #
+  # Override default responder's api behavior to not
+  # user to_format methods on a resource as a default
+  # representation but instead use a rabl template
+  #
+  class Responder < ActionController::Responder
+    def initialize(controller, resources, options = {})
+      super
+      @api_template = @controller.respond_to?(:responder_default_template, true) ? controller.send(:responder_default_template) : nil
+    end
+
+    protected
+
+    def api_behavior(error)
+      rabl_options = options.merge(template: @api_template || RablRails.responder_default_template)
+
+      if get?
+        controller.default_render rabl_options
+      elsif post?
+        controller.default_render rabl_options.merge!(status: :created, location: api_location, locals: { resource: resource })
+      else
+        head :no_content
+      end
+    end
+  end
+end

lib/rabl-rails/version.rb

@@ -1,3 +1,3 @@
 module RablRails
-  VERSION = '0.1.0'
+  VERSION = '0.1.3'
 end

rabl-rails.gemspec

@@ -1,24 +1,22 @@
 $:.push File.expand_path("../lib", __FILE__)
-
-# Maintain your gem's version:
 require "rabl-rails/version"
 
-# Describe your gem and declare its dependencies:
 Gem::Specification.new do |s|
   s.name        = "rabl-rails"
   s.version     = RablRails::VERSION
-  s.authors     = ["TODO: Your name"]
+  s.platform    = Gem::Platform::RUBY
-  s.email       = ["TODO: Your email"]
+  s.authors     = ["Christopher Cocchi-Perrier"]
-  s.homepage    = "TODO"
+  s.email       = ["cocchi.c@gmail.com"]
-  s.summary     = "TODO: Summary of RablRails."
+  s.homepage    = "https://github.com/ccocchi/rabl-rails"
-  s.description = "TODO: Description of RablRails."
+  s.summary     = "Fast Rails 3+ templating system with JSON and XML support"
+  s.description = "Fast Rails 3+ templating system with JSON and XML support"
 
-  s.files = Dir["{app,config,db,lib}/**/*"] + ["MIT-LICENSE", "Rakefile", "README.md"]
+  s.files         = `git ls-files`.split("\n")
-  s.test_files = Dir["test/**/*"]
+  s.test_files    = `git ls-files -- test/*`.split("\n")
+  s.require_paths = ["lib"]
 
-  s.add_dependency "activesupport", "~> 3.2.1"
+  s.add_dependency "activesupport", "~> 3.0"
+  s.add_dependency "railties", "~> 3.0"
 
-  s.add_development_dependency "sqlite3"
+  s.add_development_dependency "actionpack", "~> 3.0"
-  s.add_development_dependency "railties", "~> 3.2.1"
-  s.add_development_dependency "actionpack", "~> 3.2.1"
 end

test/compiler_test.rb

@@ -43,6 +43,11 @@ class CompilerTest < ActiveSupport::TestCase
     assert_equal :users, t.root_name
   end
   
+  test "root can be set to false via options" do
+    t = @compiler.compile_source(%( object :@user, root: false))
+    assert_equal false, t.root_name
+  end
+
   # Compilation
 
   test "simple attributes are compiled to hash" do

test/deep_nesting_test.rb

@@ -19,12 +19,10 @@ class DeepNestingTest < ActiveSupport::TestCase
     @post = Post.new(42, 'I rock !')
     @user = User.new(1, 'foobar', 'male')
     @user.stub(:posts).and_return([@post])
-    @user.stub(:respond_to?).with(:each).and_return(false)
 
     @context = Context.new
-    @context.stub(:instance_variable_get).with(:@user).and_return(@user)
+    @context.assigns['user'] = @user
-    @context.stub(:instance_variable_get).with(:@virtual_path).and_return('users/show')
+    @context.virtual_path = 'users/show'
-    @context.stub(:instance_variable_get).with(:@_assigns).and_return({})
     @context.stub(:lookup_context).and_return(mock(:find_template => mock(:source => %{ object :@comment\n attribute :content })))
   end
 
@@ -40,7 +38,7 @@ class DeepNestingTest < ActiveSupport::TestCase
       end
     }
 
-    assert_equal(ActiveSupport::JSON.encode(:user => {
+    assert_equal(MultiJson.encode(:user => {
       :id => 1,
       :name => 'foobar',
       :posts => [{

test/non_restful_response_test.rb

@@ -24,7 +24,7 @@ class NonRestfulResponseTest < ActiveSupport::TestCase
       end
     }
 
-    assert_equal(ActiveSupport::JSON.encode({
+    assert_equal(MultiJson.encode({
       :post_count => 10,
       :user => {
         :id => 1,

test/render_test.rb

@@ -0,0 +1,63 @@
+require 'test_helper'
+require 'pathname'
+require 'tmpdir'
+
+class RenderTest < ActiveSupport::TestCase
+
+  setup do
+    @user = User.new(1, 'Marty')
+    @tmp_path = Pathname.new(Dir.mktmpdir)
+  end
+
+  test "allow object to be passed as an option" do
+    File.open(@tmp_path + "nil.json.rabl", "w") do |f|
+      f.puts %q{
+        object :@user
+        attributes :name
+      }
+    end
+    assert_equal %q({"user":{"name":"Marty"}}), RablRails.render(nil, 'nil', locals: { object: @user }, view_path: @tmp_path)
+  end
+
+  test "load source from file" do
+    File.open(@tmp_path + "show.json.rabl", "w") do |f|
+      f.puts %q{
+        object :@user
+        attributes :id, :name
+      }
+    end
+    assert_equal %q({"user":{"id":1,"name":"Marty"}}), RablRails.render(@user, 'show', view_path: @tmp_path)
+  end
+
+  test "raise error if template is not found" do
+    assert_raises(RablRails::Renderer::TemplateNotFound) { RablRails.render(@user, 'not_found') }
+  end
+
+  test "instance variables can be passed via options[:locals]" do
+    File.open(@tmp_path + "instance.json.rabl", "w") do |f|
+      f.puts %q{
+        object false
+        node(:username) { |_| @user.name }
+      }
+    end
+    assert_equal %q({"username":"Marty"}), RablRails.render(nil, 'instance', view_path: @tmp_path, locals: { user: @user })
+  end
+
+  test "handle path for extends" do
+    File.open(@tmp_path + "extend.json.rabl", "w") do |f|
+      f.puts %q{
+        object :@user
+        extends 'base'
+      }
+    end
+
+    File.open(@tmp_path + "base.json.rabl", "w") do |f|
+      f.puts %q{
+        attribute :name, as: :extended_name
+      }
+    end
+
+    assert_equal %q({"user":{"extended_name":"Marty"}}), RablRails.render(@user, 'extend', view_path: @tmp_path)
+  end
+
+end

test/renderers/json_renderer_test.rb

@@ -4,11 +4,9 @@ class TestJsonRenderer < ActiveSupport::TestCase
 
   setup do
     @data = User.new(1, 'foobar', 'male')
-    @data.stub(:respond_to?).with(:each).and_return(false)
 
     @context = Context.new
-    @context.stub(:instance_variable_get).with(:@data).and_return(@data)
+    @context.assigns['data'] = @data
-    @context.stub(:instance_variable_get).with(:@_assigns).and_return({})
 
     @template = RablRails::CompiledTemplate.new
     @template.data = :@data
@@ -24,11 +22,18 @@ class TestJsonRenderer < ActiveSupport::TestCase
   end
 
   test "render collection with empty template" do
-    @context.stub(:instance_variable_get).with(:@data).and_return([@data])
+    @context.assigns['data'] = [@data]
     @template.source = {}
     assert_equal %q([{}]), render_json_output
   end
 
+  test "render object with local methods (used by decent_exposure)" do
+    @context.stub(:user).and_return(@data)
+    @template.data = :user
+    @template.source = { :id => :id }
+    assert_equal %q({"id":1}), render_json_output
+  end
+
   test "render single object attributes" do
     @template.source = { :id => :id, :name => :name }
     assert_equal %q({"id":1,"name":"foobar"}), render_json_output
@@ -45,6 +50,12 @@ class TestJsonRenderer < ActiveSupport::TestCase
     assert_equal %q({"author":{"name":"foobar"}}), render_json_output
   end
 
+  test "render child with local methods (used by decent_exposure)" do
+    @context.stub(:user).and_return(@data)
+    @template.source = { :author => { :_data => :user, :name => :name } }
+    assert_equal %q({"author":{"name":"foobar"}}), render_json_output
+  end
+
   test "render glued attributes from single object" do
     @template.source = { :_glue0 => { :_data => :@data, :name => :name } }
     assert_equal %q({"name":"foobar"}), render_json_output
@@ -52,7 +63,7 @@ class TestJsonRenderer < ActiveSupport::TestCase
 
   test "render collection with attributes" do
     @data = [User.new(1, 'foo', 'male'), User.new(2, 'bar', 'female')]
-    @context.stub(:instance_variable_get).with(:@data).and_return(@data)
+    @context.assigns['data'] = @data
     @template.source = { :uid => :id, :name => :name, :gender => :sex }
     assert_equal %q([{"uid":1,"name":"foo","gender":"male"},{"uid":2,"name":"bar","gender":"female"}]), render_json_output
   end
@@ -78,6 +89,7 @@ class TestJsonRenderer < ActiveSupport::TestCase
   end
 
   test "node with context method call" do
+    @context.stub(:respond_to?).with(:@data).and_return(false)
     @context.stub(:respond_to?).with(:context_method).and_return(true)
     @context.stub(:context_method).and_return('marty')
     proc = lambda { |object| context_method }
@@ -87,8 +99,7 @@ class TestJsonRenderer < ActiveSupport::TestCase
 
   test "partial should be evaluated at rendering time" do
     # Set assigns
-    @context.stub(:instance_variable_get).with(:@_assigns).and_return({'user' => @data})
+    @context.assigns['user'] = @data
-    @data.stub(:respond_to?).with(:empty?).and_return(false)
 
     # Stub Library#get
     t = RablRails::CompiledTemplate.new

test/test_helper.rb

@@ -31,10 +31,15 @@ module ActiveSupport
 end
 
 class Context
-  attr_accessor :virtual_path
+  attr_writer :virtual_path
 
   def initialize
     @_assigns = {}
+    @virtual_path = nil
+  end
+
+  def assigns
+    @_assigns
   end
 
   def params
@@ -42,4 +47,11 @@ class Context
   end
 end
 
-User = Struct.new(:id, :name, :sex)
+class User
+  attr_accessor :id, :name, :sex
+  def initialize(id=nil, name=nil, sex=nil)
+    @id = id
+    @name = name
+    @sex = sex
+  end
+end