replacements: initialize media_asset_id, old_media_asset_id columns.

script/fixes/128_backfill_replacement_media_asset_ids.rb

@@ -0,0 +1,21 @@
+#!/usr/bin/env ruby
+
+require_relative "base"
+
+with_confirmation do
+  fix = ENV.fetch("FIX", "false").truthy?
+  cond = ENV.fetch("COND", "TRUE")
+
+  replacements = PostReplacement.where("(media_asset_id IS NULL AND md5 IS NOT NULL) OR (old_media_asset_id IS NULL AND old_md5 IS NOT NULL)").where(cond)
+
+  replacements.find_each do |replacement|
+    new_media_asset = MediaAsset.active.find_by(md5: replacement.md5)
+    old_media_asset = MediaAsset.active.find_by(md5: replacement.old_md5)
+
+    replacement.media_asset = new_media_asset if replacement.media_asset.nil?
+    replacement.old_media_asset = old_media_asset if replacement.old_media_asset.nil?
+
+    puts ({ replacement: replacement.id, md5: replacement.md5, old_md5: replacement.old_md5, changes: replacement.changes, }).to_json
+    replacement.save!(touch: false) if fix && replacement.changed?
+  end
+end