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# frozen_string_literal: true
module ActionView
# = Action View Debug Helper
#
# Provides a set of methods for making it easier to debug Rails objects.
module Helpers #:nodoc:
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:
# updated_at:
# username: testing
# age: 42
# password: xyz
# created_at:
# </pre>
def debug(object)
Marshal.dump(object)
object = ERB::Util.html_escape(object.to_yaml)
content_tag(:pre, object, class: "debug_dump")
rescue # 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
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