Ignore unused display_ads columns (#6785)

app/controllers/display_ad_events_controller.rb

@@ -18,12 +18,16 @@ class DisplayAdEventsController < ApplicationMetalController
     return if Rails.env.production? && rand(20) != 1 # We need to do this operation only once in a while.
 
     @display_ad = DisplayAd.find(display_ad_event_params[:display_ad_id])
+
     num_impressions = @display_ad.display_ad_events.where(category: "impression").size
     num_clicks = @display_ad.display_ad_events.where(category: "click").size
     rate = num_clicks.to_f / num_impressions
 
-    @display_ad.
-      update_columns(success_rate: rate, clicks_count: num_clicks, impressions_count: num_impressions)
+    @display_ad.update_columns(
+      success_rate: rate,
+      clicks_count: num_clicks,
+      impressions_count: num_impressions,
+    )
   end
 
   def display_ad_event_params

app/dashboards/display_ad_dashboard.rb

@@ -13,8 +13,6 @@ class DisplayAdDashboard < Administrate::BaseDashboard
     placement_area: Field::String,
     body_markdown: Field::Text,
     processed_html: Field::Text,
-    cost_per_impression: Field::Number.with_options(decimals: 2),
-    cost_per_click: Field::Number.with_options(decimals: 2),
     impressions_count: Field::Number,
     clicks_count: Field::Number,
     success_rate: Field::Number,
@@ -47,8 +45,6 @@ class DisplayAdDashboard < Administrate::BaseDashboard
     placement_area
     body_markdown
     processed_html
-    cost_per_impression
-    cost_per_click
     impressions_count
     clicks_count
     success_rate
@@ -65,8 +61,6 @@ class DisplayAdDashboard < Administrate::BaseDashboard
     organization
     placement_area
     body_markdown
-    cost_per_impression
-    cost_per_click
     published
     approved
   ].freeze

app/models/display_ad.rb

@@ -1,4 +1,9 @@
 class DisplayAd < ApplicationRecord
+  self.ignored_columns = %w[
+    cost_per_click
+    cost_per_impression
+  ]
+
   belongs_to :organization
   has_many :display_ad_events