Heroku can't find user but works in dev - ruby-on-rails

Question

I'm hitting a problem with my heroku deployment. Here is the log:
2014-04-29T16:41:59.782999+00:00 app[web.1]: Started GET "/lines/33/edit" for 94.174.113.168 at 2014-04-29 16:41:59 +0000
2014-04-29T16:41:59.782933+00:00 app[web.1]: Started GET "/lines/33/edit" for 94.174.113.168 at 2014-04-29 16:41:59 +0000
2014-04-29T16:41:59.804819+00:00 app[web.1]:
2014-04-29T16:41:59.804823+00:00 app[web.1]: ActiveRecord::RecordNotFound (Couldn't find User with id=0):
2014-04-29T16:41:59.804826+00:00 app[web.1]: app/views/lines/_history.html.erb:7:in `block in _app_views_lines__history_html_erb__3033746240219592358_69949428301200'
2014-04-29T16:41:59.804824+00:00 app[web.1]: config/initializers/paper_trail.rb:4:in `user'
2014-04-29T16:41:59.804854+00:00 app[web.1]: app/views/lines/_history.html.erb:4:in `_app_views_lines__history_html_erb__3033746240219592358_69949428301200'
2014-04-29T16:41:59.804828+00:00 app[web.1]: app/views/lines/_history.html.erb:4:in `each'
2014-04-29T16:41:59.804856+00:00 app[web.1]: app/views/lines/edit.html.erb:16:in `_app_views_lines_edit_html_erb__4129892984524241027_69949427894700'
2014-04-29T16:41:59.804869+00:00 app[web.1]: app/views/lines/_history.html.erb:4:in `each'
2014-04-29T16:41:59.804871+00:00 app[web.1]: app/views/lines/_history.html.erb:4:in `_app_views_lines__history_html_erb__3033746240219592358_69949428301200'
2014-04-29T16:41:59.804872+00:00 app[web.1]: app/views/lines/edit.html.erb:16:in `_app_views_lines_edit_html_erb__4129892984524241027_69949427894700'
2014-04-29T16:41:59.804875+00:00 app[web.1]:
2014-04-29T16:41:59.804874+00:00 app[web.1]:
2014-04-29T16:41:59.804857+00:00 app[web.1]:
2014-04-29T16:41:59.804858+00:00 app[web.1]:
2014-04-29T16:41:59.804864+00:00 app[web.1]:
2014-04-29T16:41:59.804865+00:00 app[web.1]: ActiveRecord::RecordNotFound (Couldn't find User with id=0):
2014-04-29T16:41:59.804866+00:00 app[web.1]: config/initializers/paper_trail.rb:4:in `user'
2014-04-29T16:41:59.804868+00:00 app[web.1]: app/views/lines/_history.html.erb:7:in `block in _app_views_lines__history_html_erb__3033746240219592358_69949428301200'
The offending initializer is as follows:
module PaperTrail
class Version < ActiveRecord::Base
def user
User.find self.whodunnit.to_i
end
def nextversion
self.next
end
end
end
Which is getting called in the _history view with the following:
<%= gravatar_for version.user %><%= link_to version.user.username, user_path(version.user) %>
This works fine in development and appears to work fine in production on most edit pages but on one I am encountering this error. I wanted to check the version in the console but it seems I can't access paper_trail Versions in the console at all, I can only assume this is because I don't have a Version model, only a table and a controller.
How can I fix this?

Answer 1

You are getting following error
ActiveRecord::RecordNotFound (Couldn't find User with id=0)
on the following method
def user
puts "Value of whodunnit is -----------> #{self.whodunnit}"
User.find self.whodunnit.to_i
end
which is called in
<%= gravatar_for version.user %><%= link_to version.user.username, user_path(version.user) %>
because self.whodunnit.to_i is returning 0. That means, whodunnit is either "" or nil or 0. Please set the correct value of whodunnit attribute. Also, you can check the current value of whodunnit by adding a logger or puts statement in PaperTrail::Version# user method.

Answer 2

You probably did not ran your seed.rb file (heroku run rake db:seed) to create the user or you just are looking for an user that is not defined anymore (like deleted for example).
When you delete a user that had id=0 the next user will have id=1.
Just for sure, o recommend that you enter on your console (heroku run console) and try to find it by yourself (Client.find(0)) or try to list all of them (Client.all) to see if the user with id=0 is defined.
Hope it helps