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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
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