Doesnt work with Rails_admin gem

[bhushangahire]

Any workaround to get delete working with rails admin gem. Its trying to find relation but breaks

undefined method constantize' for nil:NilClass`

[olliebennett]

Please could you share a little more context / code?

What are you trying to delete, and how? Via the rails_admin UI?

[asnad]

Getting same error in rails 4.2 and rails_admin 1.3.0

[asnad]

Please could you share a little more context / code?

What are you trying to delete, and how? Via the rails_admin UI?

Please check the screenshot

[asnad]

@bhushangahire did you find the fix??

[asnad]

I fixed it by overriding app/views/rails_admin/main/_delete_notice.html.erb by putting following contents

<% object = delete_notice %>
<li style="display:block; margin-top:10px">
  <span class="label label-default">
    <%= @abstract_model.pretty_name %>
  </span>
  <% wording = object.send(@model_config.object_label_method) %>
  <% if show_action = action(:show, @abstract_model, object) %>
    <%= link_to(wording, url_for(action: show_action.action_name, model_name: @abstract_model.to_param, id: object.id), class: 'pjax') %>
  <% else %>
    <%= wording %>
  <% end %>
  <ul>
    <% @abstract_model.each_associated_children(object) do |association, children| %>
      <% humanized_association = @abstract_model.model.human_attribute_name association.name %>
      <% limit = children.count > 12 ? 10 : children.count %>
      <% children.first(limit).each do |child| %>
        <%= content_tag :li, class: dom_class(child) do %>
          <% if child.class.name != "RailsSettings::SettingObject" %> #condition added
            <% child_config = RailsAdmin.config(child) %>
            <%= humanized_association.singularize %>
            <% wording = child.send(child_config.object_label_method) %>
            <% if child.id && (show_action = action(:show, child_config.abstract_model, child)) %>
              <%= link_to(wording, url_for(action: show_action.action_name, model_name: child_config.abstract_model.to_param, id: child.id), class: 'pjax') %>
            <% else %>
              <%= wording %>
            <% end %>
          <% end %>
        <% end %>
      <% end %>
      <% if children.count > limit %>
        <li>
          <%= t('admin.misc.more', count: children.count - limit, models_name: humanized_association) %>
        </li>
      <% end %>
    <% end %>
  </ul>
</li>

[favour121]

Version 2.5.0 doesn't work with RailsAdmin. It fails as soon as you try viewing any model that uses has_settings.

Returned error and stacktrace:

Error: undefined method `constantize' for nil:NilClass

Stacktrace:

ledermann-rails-settings (2.5.0) lib/rails-settings/setting_object.rb:78:in _target_class' ledermann-rails-settings (2.5.0) lib/rails-settings/setting_object.rb:82:in _setting?' ledermann-rails-settings (2.5.0) lib/rails-settings/setting_object.rb:28:in respond_to?' rails_admin (3.1.2) lib/rails_admin/config/model.rb:66:in block (2 levels) in class:Model' rails_admin (3.1.2) lib/rails_admin/config/model.rb:66:in each' rails_admin (3.1.2) lib/rails_admin/config/model.rb:66:in detect' rails_admin (3.1.2) lib/rails_admin/config/model.rb:66:in block in <class:Model>' rails_admin (3.1.2) lib/rails_admin/config/configurable.rb:77:in instance_eval' rails_admin (3.1.2) lib/rails_admin/config/configurable.rb:77:in block in register_instance_option' rails_admin (3.1.2) lib/rails_admin/config/lazy_model.rb:66:in method_missing' rails_admin (3.1.2) app/helpers/rails_admin/application_helper.rb:74:in wording_for' rails_admin (3.1.2) app/controllers/rails_admin/main_controller.rb:36:in action_missing' actionpack (7.0.6) lib/abstract_controller/base.rb:229:in _handle_action_missing' actionpack (7.0.6) lib/action_controller/metal/basic_implicit_render.rb:6:in send_action' actionpack (7.0.6) lib/abstract_controller/base.rb:215:in process_action' actionpack (7.0.6) lib/action_controller/metal/rendering.rb:165:in process_action' actionpack (7.0.6) lib/abstract_controller/callbacks.rb:234:in block in process_action' activesupport (7.0.6) lib/active_support/callbacks.rb:118:in block in run_callbacks' actiontext (7.0.6) lib/action_text/rendering.rb:20:in with_renderer' actiontext (7.0.6) lib/action_text/engine.rb:69:in block (4 levels) in class:Engine' activesupport (7.0.6) lib/active_support/callbacks.rb:127:in instance_exec' activesupport (7.0.6) lib/active_support/callbacks.rb:127:in block in run_callbacks' activesupport (7.0.6) lib/active_support/callbacks.rb:138:in run_callbacks' actionpack (7.0.6) lib/abstract_controller/callbacks.rb:233:in process_action' actionpack (7.0.6) lib/action_controller/metal/rescue.rb:23:in process_action' actionpack (7.0.6) lib/action_controller/metal/instrumentation.rb:67:in block in process_action' activesupport (7.0.6) lib/active_support/notifications.rb:206:in block in instrument' activesupport (7.0.6) lib/active_support/notifications/instrumenter.rb:24:in instrument' activesupport (7.0.6) lib/active_support/notifications.rb:206:in instrument' actionpack (7.0.6) lib/action_controller/metal/instrumentation.rb:66:in process_action' actionpack (7.0.6) lib/action_controller/metal/params_wrapper.rb:259:in process_action' searchkick (5.2.4) lib/searchkick/controller_runtime.rb:15:in process_action' activerecord (7.0.6) lib/active_record/railties/controller_runtime.rb:27:in process_action' actionpack (7.0.6) lib/abstract_controller/base.rb:151:in process' actionview (7.0.6) lib/action_view/rendering.rb:39:in process' actionpack (7.0.6) lib/action_controller/metal.rb:188:in dispatch' actionpack (7.0.6) lib/action_controller/metal.rb:251:in dispatch' actionpack (7.0.6) lib/action_dispatch/routing/route_set.rb:49:in dispatch' actionpack (7.0.6) lib/action_dispatch/routing/route_set.rb:32:in serve' actionpack (7.0.6) lib/action_dispatch/journey/router.rb:50:in block in serve' actionpack (7.0.6) lib/action_dispatch/journey/router.rb:32:in each' actionpack (7.0.6) lib/action_dispatch/journey/router.rb:32:in serve' actionpack (7.0.6) lib/action_dispatch/routing/route_set.rb:852:in call' railties (7.0.6) lib/rails/engine.rb:530:in call' railties (7.0.6) lib/rails/railtie.rb:226:in public_send' railties (7.0.6) lib/rails/railtie.rb:226:in method_missing' actionpack (7.0.6) lib/action_dispatch/routing/mapper.rb:19:in block in <class:Constraints>' actionpack (7.0.6) lib/action_dispatch/routing/mapper.rb:48:in serve' actionpack (7.0.6) lib/action_dispatch/journey/router.rb:50:in block in serve' actionpack (7.0.6) lib/action_dispatch/journey/router.rb:32:in each' actionpack (7.0.6) lib/action_dispatch/journey/router.rb:32:in serve' actionpack (7.0.6) lib/action_dispatch/routing/route_set.rb:852:in call'