-class AddReportsCountToIssues < ActiveRecord::Migration
+class AddReportsCountToIssues < ActiveRecord::Migration[5.0]
def change
add_column :issues, :reports_count, :integer, :default => 0
add_foreign_key :issues, :users, :column => :updated_by, :name => "issues_updated_by_fkey", :on_delete => :cascade