调整

db/migrate/20200212072045_add_columns_to_live_links.rb

@@ -0,0 +1,8 @@
+class AddColumnsToLiveLinks < ActiveRecord::Migration[5.2]
+  def change
+    add_column :live_links, :course_name, :string
+    add_column :live_links, :platform, :string
+    add_column :live_links, :live_time, :datetime
+    add_column :live_links, :duration, :integer
+  end
+end