Merge pull request #11032 from strzalek/extract-actionview

Extract ActionView to separate directory

1 files changed, 39 insertions, 0 deletions

diff --git a/actionview/lib/action_view/helpers/debug_helper.rb b/actionview/lib/action_view/helpers/debug_helper.rb
new file mode 100644
index 0000000000..c29c1b1eea
--- /dev/null
+++ b/actionview/lib/action_view/helpers/debug_helper.rb
@@ -0,0 +1,39 @@
+module ActionView
+  # = Action View Debug Helper
+  #
+  # Provides a set of methods for making it easier to debug Rails objects.
+  module Helpers
+    module DebugHelper
+
+      include TagHelper
+
+      # Returns a YAML representation of +object+ wrapped with <pre> and </pre>.
+      # If the object cannot be converted to YAML using +to_yaml+, +inspect+ will be called instead.
+      # Useful for inspecting an object at the time of rendering.
+      #
+      #   @user = User.new({ username: 'testing', password: 'xyz', age: 42}) %>
+      #   debug(@user)
+      #   # =>
+      #   <pre class='debug_dump'>--- !ruby/object:User
+      #   attributes:
+      #   &nbsp; updated_at:
+      #   &nbsp; username: testing
+      #
+      #   &nbsp; age: 42
+      #   &nbsp; password: xyz
+      #   &nbsp; created_at:
+      #   attributes_cache: {}
+      #
+      #   new_record: true
+      #   </pre>
+      def debug(object)
+        Marshal::dump(object)
+        object = ERB::Util.html_escape(object.to_yaml).gsub("  ", "&nbsp; ").html_safe
+        content_tag(:pre, object, :class => "debug_dump")
+      rescue Exception  # errors from Marshal or YAML
+        # Object couldn't be dumped, perhaps because of singleton methods -- this is the fallback
+        content_tag(:code, object.inspect, :class => "debug_dump")
+      end
+    end
+  end
+end