rails get a list from two separate models that have similar features

Question

I need to make a consolidated list of payable services, with filtering, ordering and pagination (with willpaginate gem) the payable services are stored in two separate models, Application and Support, both have similar fields (that I need to show in the columns) but I would need to have both in the same query.

here's my situation:

class Application < ActiveRecord::Base
  // name, created_at, price ... 
  has_many :supports
end

class Support < ActiveRecord::Base
  // name, application_id, created_at, price ... 
  belongs_to :application
end

and the controller:

class PaymentsController < ApplicationController

  FILTER_STRINGS = {
    requested: { reference_status: 'requested' },
    sent: { reference_status: 'sent' },
    completed: { reference_status: 'completed' }
  }

  ORDER_STRINGS = {
    name: 'name %1$s',
    price: 'price %1$s',
    date: 'created_at %1$s'
  }

  def payable_list
    @applications = Application.all
    @applications = @applications.where(FILTER_STRINGS[filter_params[:filter].to_sym]) if filter_params[:filter]
    order_string = format(ORDER_STRINGS[sort_params[:sort].downcase.to_sym], sort_params[:dir])
    @applications = @applications.order(order_string)
    @applications = @applications.paginate(page: params[:page] || 1, per_page: 20)
  end
...
end

The controller currently only loads the Application, but I need to include the Support items as well, in the view I will append the string '(Support)' for support items, to differentiate the items.

How could I include both models in the same ActiveRecord_Relation, so that I can sort them together? I would have no issues with using Ruby to sort the lists, but then I'd have problems with will paginate who seems to only work with ActiveRecord_Relation.

I tried using a join clause, but that still returns an Application object

Application.joins('JOIN supports ON "supports"."application_id" = "applications"."id"')

I tried union as well, with this command:

Application.find_by_sql("SELECT 
'application' AS role,
applications.id AS id, 
applications.price AS price, 
applications.application_id AS application_or_support, 
to_char(applications.created_at, 'DD Month YYYY, HH24:MI') AS created_at, 
FROM applications
UNION
select 
'support' AS role,
supports.id AS id, 
supports.price AS price, 
supports.support_id AS application_or_support, 
to_char(supports.created_at, 'DD Month YYYY, HH24:MI') AS created_at, 
from supports;")

but it's only giving me the columns that have a match in the applications model.

I'm thinking that maybe I could make a new model not backed by a DB table, where the rows would originate from that union query, but I wouldn't know how to go about the syntax to get it done.