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module ActionView
module Helpers
# Provides a set of methods for making it easier to debug Rails objects.
module DebugHelper
# 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.
#
# ==== Example
#
# @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:
# attributes_cache: {}
#
# new_record: true
# </pre>
def debug(object)
begin
Marshal::dump(object)
"<pre class='debug_dump'>#{h(object.to_yaml).gsub(" ", " ")}</pre>"
rescue Exception => e # errors from Marshal or YAML
# Object couldn't be dumped, perhaps because of singleton methods -- this is the fallback
"<code class='debug_dump'>#{h(object.inspect)}</code>"
end
end
end
end
end
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