Defining different attributes for `new`/`create` or `edit`/`update` actions without defining `FORM_ATTRIBUTES` makes it crash

[pjmartorell]

• What were you trying to do?
  Upgraded from 0.13 to main (9e462f7). I tried to define different attributes for new/create or edit/update actions as stated here: https://github.com/thoughtbot/administrate/blob/main/docs/customizing_dashboards.md#form-attributes

  When trying to update or create a record in the dashboard, there is a crash. This is because, when validating permitted attributes, it's trying to get these attributes from self.class::FORM_ATTRIBUTES but it should get them from "FORM_ATTRIBUTES_#{action.upcase}" as FORM_ATTRIBUTES is not defined anymore. specific_form_attributes_for(action) is returning nil because action is not being passed in permitted_attributes. So the solution is to pass the action_name when checking permitted attributes.

• What did you end up with (logs, or, even better, example apps are great!)?
  The affected code is related with Allow different form attributes for new/update actions #1991
  Logs:
  

  My workaround:
  In my UserDashboard added the following overrides:

  def permitted_attributes(action)
    action =
      case action
      when "update" then "edit"
      when "create" then "new"
      else action
      end
  
    form_attributes(action).map do |attr|
      attribute_types[attr].permitted_attribute(
        attr,
        resource_class: self.class.model
      )
    end.uniq
  end
  
  def form_attributes(action = nil)
    specific_form_attributes_for(action) || self.class::FORM_ATTRIBUTES
  end
  
  def specific_form_attributes_for(action)
    return unless action
  
    cname = "FORM_ATTRIBUTES_#{action.upcase}"
  
    self.class.const_get(cname) if self.class.const_defined?(cname)
  end

  In my Admin::UsersController add the following override:

  def resource_params
    params.require(resource_class.model_name.param_key)
          .permit(dashboard.permitted_attributes(action_name))
          .transform_values { |v| read_param_value(v) }
  end

• What versions are you running?

  • Rails: 6.1.3.1
  • administrate (9e462f7)

[pablobm]

Thank you for the report @pjmartorell. It looks like we could have used a feature spec there. Do you think you'd be able to provide a PR?

[pjmartorell]

yes, now that I'm on holidays I'll probably have time to do a PR 😅👍

[jordan-brough]

@pjmartorell do you still plan on making a PR? I might be up for making one if not.

[nunocarvalhog]

@jordan-brough that would be great 👍 I just run into this issue too.

[pablobm]

@jordan-brough - Go for it! 🚀

[pablobm]

fixed by #2352