Render on-screen report as HTML in renderer

So it can be treated like any other format.

app/controllers/admin/reports_controller.rb

@@ -49,6 +49,7 @@ module Admin
                         I18n.t(:name, scope: [:admin, :reports, @report_type])
                       end
       @rendering_options = rendering_options
+      @table = @report.to_html if request.post?
       @data = Reporting::FrontendData.new(spree_current_user)
     end
   end

app/views/admin/reports/_table.html.haml

@@ -1,5 +1,3 @@
-- report ||= @report
-
 .report__table-container
   %table.report__table
     %thead

app/views/admin/reports/show.html.haml

@@ -19,7 +19,4 @@
   - if request.post?
     %button.btn-print.icon-print{ onclick: "window.print()"}= t(:report_print)
 
-/ We don't want to render data unless search params are supplied.
-/ Compiling data can take a long time.
-- if request.post?
-  = render "table"
+= @table

lib/reporting/report_renderer.rb

@@ -46,6 +46,14 @@ module Reporting
       public_send("to_#{target_format}")
     end
 
+    def to_html(layout: nil)
+      ApplicationController.render(
+        template: "admin/reports/_table",
+        layout: layout,
+        locals: { report: @report }
+      )
+    end
+
     def to_csv
       SpreadsheetArchitect.to_csv(headers: table_headers, data: table_rows)
     end
@@ -55,11 +63,7 @@ module Reporting
     end
 
     def to_pdf
-      html = ApplicationController.render(
-        template: "admin/reports/_table",
-        layout: "pdf",
-        locals: { report: @report }
-      )
+      html = to_html(layout: "pdf")
       WickedPdf.new.pdf_from_string(html)
     end
 

lib/reporting/report_template.rb

@@ -5,7 +5,7 @@ module Reporting
     include ReportsHelper
     attr_accessor :user, :params, :ransack_params
 
-    delegate :render_as, :as_json, :to_csv, :to_xlsx, :to_pdf, :to_json, to: :renderer
+    delegate :render_as, :as_json, :to_html, :to_csv, :to_xlsx, :to_pdf, :to_json, to: :renderer
     delegate :raw_render?, :html_render?, :display_header_row?, :display_summary_row?, to: :renderer
 
     delegate :rows, :table_rows, :grouped_data, to: :rows_builder