Generate fails with: "NoMethodError: undefined method `name' for nil:NilClass"

[alec-implicitdesign]

I can't really make out what is causing it to fail. I saw a similar issue in #303, but I don't see any mention paper-trail in the output here.

$ bundle exec rails db:migrate
...
NoMethodError: undefined method `name' for nil:NilClass
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain.rb:102:in `block (2 levels) in relationships_mapping'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain.rb:100:in `each'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain.rb:100:in `block in relationships_mapping'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain.rb:99:in `tap'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain.rb:99:in `relationships_mapping'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain.rb:77:in `relationships_by_entity_name'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain/attribute.rb:80:in `foreign_key?'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/domain/attribute.rb:58:in `content?'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:207:in `block (2 levels) in filtered_attributes'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:207:in `each'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:207:in `none?'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:207:in `block in filtered_attributes'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:204:in `reject'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:204:in `filtered_attributes'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:136:in `block in generate'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:135:in `each'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:135:in `generate'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:119:in `create'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/diagram.rb:74:in `create'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/rails_erd/tasks.rake:61:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.5.0/gems/bugsnag-6.11.1/lib/bugsnag/integrations/rake.rb:18:in `execute_with_bugsnag'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/tasks/auto_generate_diagram.rake:18:in `update_model'
/app/vendor/bundle/ruby/2.5.0/gems/rails-erd-1.6.0/lib/tasks/auto_generate_diagram.rake:3:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.5.0/gems/bugsnag-6.11.1/lib/bugsnag/integrations/rake.rb:18:in `execute_with_bugsnag'
/app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/commands/rake/rake_command.rb:23:in `block in perform'
/app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/commands/rake/rake_command.rb:20:in `perform'
/app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/command.rb:48:in `invoke'
/app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.3/lib/rails/commands.rb:18:in `<top (required)>'
/app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
/app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
/app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
/app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
/app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.4.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
/app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
/app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
bin/rails:9:in `<main>'
Tasks: TOP => erd => erd:generate

[vaibhav8186]

Yes. I am getting the same error. while doing - rake erd

[sschroed]

+1

[nguyenduyta-raksul]

I think you don't have a versions table. Follow the below example. You need to define ApplicationVersion with abstract_class
https://github.com/paper-trail-gem/paper_trail#configuration

[dmuneras]

+1