Match Dev Asset Experience to Production

CHANGELOG.md

@@ -1,3 +1,11 @@
+### Master
+
+*   Assets not in the precompile list can be checked for errors by setting
+     `config.assets.raise_runtime_errors  = true` in any environment
+
+     *Richard Schneeman*
+
+
 ### 2.0.1
 
 *   Allow keep value to be specified for `assets:clean` run with args

lib/sprockets/rails/helper.rb

@@ -8,7 +8,7 @@ module Helper
       # support for Ruby 1.9.3 && Rails 3.0.x
       @_config = ActiveSupport::InheritableOptions.new({}) unless defined?(ActiveSupport::Configurable::Configuration)
       include ActiveSupport::Configurable
-      config_accessor :raise_runtime_errors
+      config_accessor :precompile, :assets, :raise_runtime_errors
 
       class DependencyError < StandardError
         def initialize(path, dep)
@@ -18,6 +18,15 @@ def initialize(path, dep)
         end
       end
 
+      class AssetFilteredError < StandardError
+        def initialize(source)
+          msg = "Asset filtered out and will not be served: " <<
+                "add `config.assets.precompile += %w( #{source} )` " <<
+                "to `config/application.rb` and restart your server"
+          super(msg)
+        end
+      end
+
       if defined? ActionView::Helpers::AssetUrlHelper
         include ActionView::Helpers::AssetUrlHelper
         include ActionView::Helpers::AssetTagHelper
@@ -62,6 +71,21 @@ def compute_asset_path(path, options = {})
         end
       end
 
+      # Computes the full URL to a asset in the public directory. This
+      # method checks for errors before returning path.
+      def asset_path(source, options = {})
+        check_errors_for(source)
+        path_to_asset(source, options)
+      end
+      alias :path_to_asset_with_errors :asset_path
+
+      # Computes the full URL to a asset in the public directory. This
+      # will use +asset_path+ internally, so most of their behaviors
+      # will be the same.
+      def asset_url(source, options = {})
+        path_to_asset_with_errors(source, options.merge(:protocol => :request))
+      end
+
       # Get digest for asset path.
       #
       # path    - String path
@@ -104,6 +128,7 @@ def javascript_include_tag(*sources)
 
         if options["debug"] != false && request_debug_assets?
           sources.map { |source|
+            check_errors_for(source)
             if asset = lookup_asset_for_path(source, :type => :javascript)
               asset.to_a.map do |a|
                 super(path_to_javascript(a.logical_path, :debug => true), options)
@@ -123,9 +148,9 @@ def javascript_include_tag(*sources)
       # Eventually will be deprecated and replaced by source maps.
       def stylesheet_link_tag(*sources)
         options = sources.extract_options!.stringify_keys
-
         if options["debug"] != false && request_debug_assets?
           sources.map { |source|
+            check_errors_for(source)
             if asset = lookup_asset_for_path(source, :type => :stylesheet)
               asset.to_a.map do |a|
                 super(path_to_stylesheet(a.logical_path, :debug => true), options)
@@ -141,14 +166,33 @@ def stylesheet_link_tag(*sources)
       end
 
       protected
-
         # Checks if the asset is included in the dependencies list.
         def check_dependencies!(dep)
           if raise_runtime_errors && !_dependency_assets.detect { |asset| asset.include?(dep) }
             raise DependencyError.new(self.pathname, dep)
           end
         end
 
+        # Raise errors when source does not exist or is not in the precompiled list
+        def check_errors_for(source)
+          source = source.to_s
+          return source if !self.raise_runtime_errors || source.blank? || source =~ URI_REGEXP
+          asset = lookup_asset_for_path(source)
+
+          if asset && asset_needs_precompile?(source, asset.pathname.to_s)
+            raise AssetFilteredError.new(source)
+          end
+        end
+
+        # Returns true when an asset will not be available after precompile is run
+        def asset_needs_precompile?(source, filename)
+          if assets_environment && assets_environment.send(:matches_filter, precompile || [], source, filename)
+            false
+          else
+            true
+          end
+        end
+
         # Enable split asset debugging. Eventually will be deprecated
         # and replaced by source maps in Sprockets 3.x.
         def request_debug_assets?

lib/sprockets/railtie.rb

@@ -113,6 +113,9 @@ def configure(&block)
         app.assets = app.assets.index
       end
 
+
+      Sprockets::Rails::Helper.precompile         ||= app.config.assets.precompile
+      Sprockets::Rails::Helper.assets             ||= app.assets
       Sprockets::Rails::Helper.raise_runtime_errors = app.config.assets.raise_runtime_errors
 
       if config.assets.compile

test/fixtures/error/dependency.js.erb

@@ -1 +1 @@
-<%= asset_path("bar.js") %>
+<%= asset_path("bar.js") %>

test/test_helper.rb

@@ -372,6 +372,56 @@ def test_stylesheet_path
     assert_equal "/assets/foo-#{@foo_css_digest}.css", @view.stylesheet_path("foo")
   end
 
+  def test_public_folder_fallback_works_correctly
+    @view.raise_runtime_errors = true
+    @view.debug_assets       = true
+
+    @view.asset_path("asset-does-not-exist-foo.js")
+    @view.asset_url("asset-does-not-exist-foo.js")
+    @view.stylesheet_link_tag("asset-does-not-exist-foo.js")
+    @view.javascript_include_tag("asset-does-not-exist-foo.js")
+  end
+
+  def test_asset_not_precompiled_error
+    @view.raise_runtime_errors = true
+    @view.precompile         = [ lambda {|logical_path| false } ]
+    @view.assets_environment = @assets
+    @view.debug_assets       = true
+
+    assert_raise(Sprockets::Rails::Helper::AssetFilteredError) do
+      @view.asset_path("foo.js")
+    end
+
+    assert_raise(Sprockets::Rails::Helper::AssetFilteredError) do
+      @view.asset_url("foo.js")
+    end
+
+    assert_raise(Sprockets::Rails::Helper::AssetFilteredError) do
+      @view.javascript_include_tag("foo.js")
+    end
+
+    assert_raise(Sprockets::Rails::Helper::AssetFilteredError) do
+      @view.javascript_include_tag("foo")
+    end
+
+    error = assert_raise(Sprockets::Rails::Helper::AssetFilteredError) do
+      @view.javascript_include_tag(:foo)
+    end
+
+    assert_raise(Sprockets::Rails::Helper::AssetFilteredError) do
+      @view.stylesheet_link_tag("foo.js")
+    end
+
+    @view.precompile  = [ lambda {|logical_path| true } ]
+
+    @view.asset_path("foo.js")
+    @view.asset_url("foo.js")
+    @view.javascript_include_tag("foo.js")
+    @view.javascript_include_tag("foo")
+    @view.javascript_include_tag(:foo)
+    @view.stylesheet_link_tag("foo.js")
+  end
+
   def test_asset_digest_path
     assert_equal "foo-#{@foo_js_digest}.js", @view.asset_digest_path("foo.js")
     assert_equal "foo-#{@foo_css_digest}.css", @view.asset_digest_path("foo.css")
@@ -384,13 +434,17 @@ def test_asset_digest
 end
 
 class ErrorsInHelpersTest < HelperTest
+
   def test_dependency_error
     @view.raise_runtime_errors = true
+    @view.precompile           = [ lambda {|logical_path| true } ]
+    @view.assets_environment   = @assets
+
     assert_raise Sprockets::Rails::Helper::DependencyError do
-      @assets['error/dependency.js'].to_s
+      @view.asset_path("error/dependency.js")
     end
 
     @view.raise_runtime_errors = false
-    @assets['error/dependency.js'].to_s
+    @view.asset_path("error/dependency.js")
   end
-end
+end