uploads: add columns needed for multi-file uploads.

* uploads.media_asset_count - the number of media assets attached to this upload.
* upload_media_assets.status - the status of each media asset attached to this upload (processing, active, failed)
* upload_media_assets.source_url - the source of each media asset attached to this upload
* upload_media_assets.error - the error message if uploading the media asset failed

app/models/upload.rb

@@ -74,7 +74,7 @@ class Upload < ApplicationRecord
   end
 
   def self.search(params)
-    q = search_attributes(params, :id, :created_at, :updated_at, :source, :referer_url, :status, :uploader, :upload_media_assets, :media_assets)
+    q = search_attributes(params, :id, :created_at, :updated_at, :source, :referer_url, :status, :media_asset_count, :uploader, :upload_media_assets, :media_assets)
     q.apply_default_order(params)
   end
 

app/models/upload_media_asset.rb

@@ -4,8 +4,15 @@ class UploadMediaAsset < ApplicationRecord
   belongs_to :upload
   belongs_to :media_asset
 
+  enum status: {
+    pending: 0,
+    processing: 100,
+    active: 200,
+    failed: 300,
+  }
+
   def self.search(params)
-    q = search_attributes(params, :id, :created_at, :updated_at, :upload, :media_asset)
+    q = search_attributes(params, :id, :created_at, :updated_at, :status, :source_url, :error, :upload, :media_asset)
     q.apply_default_order(params)
   end
 end