Rails - Convert an ActiveRecord to a simple object to add field dynamically

Question

I am retrieving data from the database. Then I am sending it in JSON.

The thing is, I need to add dynamically a field "campaign_name".

def loadtimeline

    @act = Activity.order('created_at desc').paginate(:page => params[:page], :per_page => 40)



    @act.each do |item|

      item.attributes[:campaign_name] = item.campaign.name

    end



    respond_to do |format|

      format.json do

        render json: @act

      end

    end

end

Finally, the moment I check client, the new field doesn't appear.

So I told myself it could be related to this object is an ActiveRecord Model. So I am trying to convert it as an object.

Is that possible or is there a way to add the field I need?

Thank you for your help.

EDIT1.
I didn't precise, but

item.campaign

belongs to an other model Campaign.

class Activity < ActiveRecord::Base

  belongs_to :user

  belongs_to :campaign



  attr_accessor :campaign_name



  def item

    if item_path && item_id

      case item_path

        when /todo/

          Todo.find(item_id)

        when /content/

          Content.find(item_id)

        when /netlinking/

          Netlinking.find(item_id)

        else

          nil

      end

    end

  end

end

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Answer 1

You could achieve this with some thing like this:

@act = Activity.includes(:campaign).order('created_at desc')  
acts = []  
@act.each do |item|  
  acts << item.attributes.merge({campaign_name: item.campaign.name})  
end

Then render the acts array.
I think using view is clearer.

Rails - Convert an ActiveRecord to a simple object to add field dynamically

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