Undefined method `to_sym' for nil:NilClass

[drcarrasco]

Describe the bug For some reason, some classes don't have names, and this is causing the app to crash.

Reproduction steps I don't understand why my class doesn't have a name.

Expected behavior Rails Admin will work correctly.

Additional context

• rails version: 6.1
• rails_admin version: 3.1.2
• rails_admin npm package version: 3.1.2
  full stack trace

  => ["/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/lib/rails_admin/config.rb:233:in `model'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/lib/rails_admin.rb:33:in `config'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/lib/rails_admin/config/actions/index.rb:25:in `block in '", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/lib/rails_admin/config/configurable.rb:77:in `instance_eval'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/lib/rails_admin/config/configurable.rb:77:in `block in register_instance_option'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/lib/rails_admin/config/proxyable/proxy.rb:27:in `method_missing'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/app/helpers/rails_admin/application_helper.rb:137:in `breadcrumb'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/app/views/layouts/rails_admin/content.html.erb:16:in `__home_danielcarrasco__rbenv_versions_______lib_ruby_gems_______gems_rails_admin_______app_views_layouts_rails_admin_content_html_erb___4124863421041472512_114880'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/base.rb:247:in `public_send'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/base.rb:247:in `_run'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/template.rb:154:in `block in render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `block in instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/template.rb:345:in `instrument_render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/template.rb:152:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:61:in `block (2 levels) in render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `block in instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:56:in `block in render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:75:in `render_with_layout'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:55:in `render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:11:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/renderer.rb:61:in `render_template_to_object'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/renderer.rb:29:in `render_to_object'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/renderer.rb:22:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/helpers/rendering_helper.rb:38:in `block in render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/base.rb:273:in `in_rendering_context'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/helpers/rendering_helper.rb:34:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/rails_admin-3.1.2/app/views/layouts/rails_admin/application.html.erb:21:in `__home_danielcarrasco__rbenv_versions_______lib_ruby_gems_______gems_rails_admin_______app_views_layouts_rails_admin_application_html_erb___1258668183099005875_112320'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/base.rb:247:in `public_send'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/base.rb:247:in `_run'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/template.rb:154:in `block in render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `block in instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/template.rb:345:in `instrument_render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/template.rb:152:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:72:in `block in render_with_layout'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `block in instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/notifications.rb:203:in `instrument'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:70:in `render_with_layout'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:55:in `render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/template_renderer.rb:11:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/renderer.rb:61:in `render_template_to_object'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/renderer/renderer.rb:29:in `render_to_object'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/rendering.rb:117:in `block in _render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/base.rb:273:in `in_rendering_context'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/rendering.rb:116:in `_render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/streaming.rb:218:in `_render_template'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionview-6.1.6.1/lib/action_view/rendering.rb:103:in `render_to_body'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/rendering.rb:52:in `render_to_body'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/renderers.rb:142:in `render_to_body'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/abstract_controller/rendering.rb:25:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/rendering.rb:36:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/instrumentation.rb:46:in `block (2 levels) in render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/3.0.0/benchmark.rb:308:in `realtime'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activesupport-6.1.6.1/lib/active_support/core_ext/benchmark.rb:14:in `ms'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/instrumentation.rb:46:in `block in render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/instrumentation.rb:86:in `cleanup_view_runtime'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/activerecord-6.1.6.1/lib/active_record/railties/controller_runtime.rb:34:in `cleanup_view_runtime'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/actionpack-6.1.6.1/lib/action_controller/metal/instrumentation.rb:45:in `render'", "/home/danielcarrasco/.rbenv/versions/3.0.5/lib/ruby/gems/3.0.0/gems/wicked_pdf-2.1.0/lib/wicked_pdf/pdf_helper.rb:46:in `call'", 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I think that all instances of to_sym should be preceded by try. Is there a specific reason why try was only added to RailsAdmin::AbstractModel? https://github.com/railsadminteam/rails_admin/blob/5a958e46e8620fba320e04347d326d058c07d396/lib/rails_admin/config.rb#L215-L243

My code enters the Class, ConstLoadSuppressor::ConstProxy condition and crashes.

P.S. Adding try to the base code makes it work correctly.