Merge remote-tracking branch 'tootsuite/master' into glitchsoc/master

db/migrate/20171130000000_add_embed_url_to_preview_cards.rb

@@ -0,0 +1,18 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddEmbedUrlToPreviewCards < ActiveRecord::Migration[5.1]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    safety_assured do
+      add_column_with_default :preview_cards, :embed_url, :string, default: '', allow_null: false
+    end
+  end
+
+  def down
+    execute "UPDATE preview_cards SET url=embed_url WHERE embed_url!=''"
+    remove_column :preview_cards, :embed_url
+  end
+end