Displaying other model attributes in the list view of rails_admin

[Lee Graham]

I realize that the purpose of rails_admin is supposed to essentially be a model admin tool, but I would like to have a list view for a model and include attributes of associated models in the list of the of model.

For example. I have a scale model and a container model. The container has an attribute 'weight', and the scale is associated via a 'has_one' relationship to container.

How can I include scale.container.weight in the scale model list view?

And example of my current Scale model is:

class Scale < ActiveRecord::Base
   attr_accessible :activated, :cluster, :name, :plant, :status, :timer, :unauthorized, :uid, :container_id, :customer_id

    has_one :container

    rails_admin do
       list do
          field :name
          field :activated
          field Scale.container.weight # This is what I'm trying to include. However, this certainly doesn't produce the desired results. 
       end
    end
end

Thanks!

[Benoit Bénézech]

Use 'accepts_nested_attributes_for :container' in the Scale model and configure the nested section of the Container model to show only the relevant column.

Otherwise you can use a delegate or your own getter/setter and create a column with the same name. Just mark it as 'searchable false/sortable false'.

[Lee Graham]

Hi Benoit, 

How exactly would I configure the nested section of container? I've tried something like: 

Container.rb

class Container < ActiveRecord::Base

   attr_accessible :name, :material_type, :maxTimestamp, :eightyTimestamp, :tare_weight, :weight, :weight_type, :unit, :scale_id, :alloy, :material, :customer, :max_weight, :price, :rfid_id, :customer_id

   belongs_to :scale

   belongs_to :customer

   has_one :rfid

   validates_presence_of :scale, :customer

   rails_admin do

      configure :nested_form_for

         field :weight do

         end

   end

end

So, the weight only shows up when I go to the container, but when I navigate to the scale, it doesn't show the nested attribute.

scale.rb

class Scale < ActiveRecord::Base

   attr_accessible :activated, :cluster, :name, :plant, :status, :timer, :unauthorized, :uid, :container_id, :customer_id, # :as => :admin

   # attr_accessible :activated

   # Make the Scale model reportable to Ruport

   acts_as_reportable

   

   has_one :container

   # Paper_trail privides history tracking for models

   # For documentation on how to use paper_trail, see:

   # https://github.com/airblade/paper_trail

   # has_paper_trail

   # Configures the list, details, etc. views in rails_admin. For 

   # details on how to customize this configuration please see:

   # https://github.com/sferik/rails_admin/wiki/Railsadmin-DSL

   accepts_nested_attributes_for :container

   rails_admin do

      list do

         field :name

         field :activated

         field :weight # it doesn't show weight here as a nested attribute

      end

      edit do

      end

   end

end

Thanks, 

Lee

[Lee Graham]

I see that I also need to include container_attributes since I am using attr_accesible. My container now looks like:

Scale.rb

------------

class Scale < ActiveRecord::Base

   attr_accessible :activated, :cluster, :name, :plant, :status, :timer, 

   :unauthorized, :uid, :container_id, :customer_id, :container_attributes, :battery_id

   

   has_one :container

   accepts_nested_attributes_for :container

   rails_admin do

       list do

          field :name

          field :activated

          field :container # when I add this, I get the link to the container model list view

        end

   end

end

Container.rb

-----------------

class Container < ActiveRecord::Base

   attr_accessible :name, :material_type, :maxTimestamp, :eightyTimestamp, :tare_weight, 

   :weight, :weight_type, :unit, :scale_id, :alloy, :material, :customer, :max_weight, 

   :price, :rfid_id, :customer_id

 

   belongs_to :scale

   validates_presence_of :scale

   rails_admin do

      list do

         field :weight

      end

      show do

         field :weight

      end

   end

end

The problem is that I don't understand how to use the configure option in the DSL to just display the weight on Scale list view. The closest I seem to be able to get to display the weight of the container on the list view is I can get a link to the model to appear by adding `field :container` in the rails_admin config for scale. I know you mentioned using `configure` to add the various attributes of the nested model, but I'm not clear on how to use it.

Thanks so much for your assistance! 

[Joop Verbaken]

Hi Lee

I am also struggling with this and have not resolved it.

If you resolve it, your code could be the example that we all can look for to implement this great feature in rails_admin.

I hope too that some one will help us out.

Thanks already for writing this up.

Joop 

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[Lee Graham]

Hi Joop, 

Glad to hear that I'm not the only one. Let's see what the rails_admin master Benoit has to say :)

Lee

[Benoit Bénézech]

With delegates :

class Scale < ActiveRecord::Base
    has_one :container

    delegate :weight, to: :container, prefix: true

    rails_admin do
       list do
          field :name
          field :

activated
          field :container_weight do

             searchable false # AR sorting/searching probably don't work out of the box with delegates, I'm not an expert on this

          end

       end
    end
end

Or RailsAdmin only:

class Scale < ActiveRecord::Base
    has_one :container

    rails_admin do
       list do
          field :name
          field :

activated
          field :container_weight do

             def value

               bindings[:object].container.weight

             end

          end

       end
    end
end

For forms, you will need to go with accepts_nested_attributes. (peruse through the wiki for more)

Good luck guys !

[Куликов Дмитрий]

Hello! Try this:

config.model Model do
    list do
      field :assos_field do
        pretty_value do
          bindings[:object].assos_field.your_field
        end
      end
      include_all_fields
    end
  end

[Ricardo Paiva]

is it possible to hide a column based on a user role (by accessing devise current_user) ?

thanks