NameError: wrong constant name

[c0mrade]

I ll describe everything I've done just so I m not missing anything obvious, here is what I've done so far :

1. Created a class :

# app/models/history_tracker.rb
class HistoryTracker
  include Mongoid::History::Tracker
end

2. Added an initializer :

# config/mongoid_history.rb
Mongoid::History.tracker_class_name = :history_tracker

3. Added tracking to my model

class Agreement
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::History::Trackable
  include Mongoid::Attributes::Dynamic

  field :licencing_fee, type: Integer
  field :q1_dollars, type: Integer
  field :q2_dollars, type: Integer
  field :q3_dollars, type: Integer
  field :q4_dollars, type: Integer

  track_history   :on => [:licencing_fee, :q2_dollars, :q2_dollars, :q3_dollars, :q4_dollars],     # track title and body fields only, default is :all
                  :modifier_field => :modifier, 
                  :modifier_field_inverse_of => :nil, 
                  :version_field => :version,        
                  :track_create   =>  true,          
                  :track_update   =>  true,        
                  :track_destroy  =>  true   
end

4. When performing save! on my model I set the modifier:

user = ....
agreement = Agreement.new
agreement.modifier = user
agreement.licencing_fee = 500
agreement.save!

5. Then save! method produces this error :

NameError: wrong constant name 
from /Users/nedstark/workspace/agreement-guide/vendor/bundle/gems/activesupport-5.0.1/lib/active_support/inflector/methods.rb:261:in `const_get'

What am I doing wrong here?

[dblock]

What's the stack here? Check that the model is actually loaded (just stick a puts inside history_tracker.rb).

[h8rry]

@dblock I encountered the same problem. It seems that, by default, the model HistoryTracker wasn't loaded. I had to add the mongoid_history.rb in the initializer (which the documentation states is optional).

[dblock]

Interesting, this probably is a bug, would appreciate a PR to fix it. Maybe we can even have a spec for this?

[sumandroid]

Definitely the tracking history problem I encountered this problem and after disabling the tracking temporarily, the error was gone. @h8rry is right!!!

[ArmandoAssuncao]

This problem occurence because only include the module Mongoid::History::Tracker not call the your block included.
So how tracker_class_name is nil, the line raises error NameError: wrong constant name

mongoid-history/lib/mongoid/history/trackable.rb

Lines 67 to 68 in 8ed7ba1

	klass = history_trackable_options[:tracker_class_name] || Mongoid::History.tracker_class_name
	klass.is_a?(Class) ? klass : klass.to_s.camelize.constantize

some possible solutions are:

• creates the initializer file.
• or activate eager_load config.eager_load = true in file config/enviroments/development.rb