I handle RecordNotFound error in my application_controller.rb as follow:
rescue_from ActiveRecord::RecordNotFound, :with => :record_not_found private def record_not_found flash[:error] = "Oops, we cannot find this record" redirect_to :back end But I would like to get more information, such as class/table name of which record was not found. How should I go about it?
Thank you.
I had some success with this:
# in app/controllers/application_controller.rb rescue_from ActiveRecord::RecordNotFound, with: :record_not_found def record_not_found exception result = exception.message.match /Couldn't find ([\w]+) with 'id'=([\d]+)/ # result[1] gives the name of the model # result[2] gives the primary key ID of the object that was not found end HTH
EDIT: Whitespace error removed at the end of the Regex. Thanks to the commenters. :)
"Couldn't find EventType with 'id'=1".match(/Couldn't find ([\w]+) with 'id'=([\d]+) / returns nothing...with 'id'=([\d]+)[this whitespace]/You can define a parameter in your rescue handler and exception will be passed there.
def record_not_found exception flash[:error] = "Oops, we cannot find this record" # extract info from exception redirect_to :back end If you can't get that info from the exception, you're out of luck (I think).
Say for example,
begin @user = User.find(params[:id]) rescue ActiveRecord::RecordNotFound flash[:notice] = "#No such record in User for id :: {params[:id]} on #{action_name}" end UPDATE
flash[:notice] = t('flash.recordnotfound',:class_name => self.class.name, :column_name => params[:id], :action_name => action_name) Now in your config/locales/en.yml (this would help translate, refer to i18n here)
flash: recordnotfound: "Sorry, no record od %{column_name} in class %{class_name} was found on you action %{action_name}" If you do not want to use locales just put up this information in flash[:notice] itself.
More dynamic ?
Write a function and use the same flash [:notice] there. Wont hurt at all.
want more data ?
Heres a quick solution, i always <%= params%> in my views to know easily whats going and whats coming. You can then open your rails console and play along with different actions and so on.
user = User.new user.save user.errors.messages All of this is good enough data, i think.
Good luck.
Once you instantiate the model, you can check something like.
human = Human.new human.errors Check this in rails console so you could play with it and use it in the main controller.
rescue_from ActiveRecord::RecordNotFound do |exception| raise ActiveRecord, exception.message, exception.backtrace end EDIT Make sure you the application controller extends the base.
class ApplicationController < ActionController::Base rescue_from Exception, :with => :record_not_found private def record_not_found(e) flash[:error] = "Oops, we cannot find this record" + e.message redirect_to :back end end 
ActiveRecord::RecordNotFoundinstances carry along zero information with it (class RecordNotFound < ActiveRecordError; end, end of the story).