class ActiveRecord::PendingMigrationError

:nodoc:

def detailed_migration_message 

def detailed_migration_message
  message = "Migrations are pending. To resolve this issue, run:\n\n        bin/rails db:migrate"
  message += " RAILS_ENV=#{::Rails.env}" if defined?(Rails.env)
  message += "\n\n"
  pending_migrations = ActiveRecord::Base.connection.migration_context.open.pending_migrations
  message += "You have #{pending_migrations.size} pending #{pending_migrations.size > 1 ? 'migrations:' : 'migration:'}\n\n"
  pending_migrations.each do |pending_migration|
    message += "#{pending_migration.basename}\n"
  end
  message
end

def initialize(message = nil) 

def initialize(message = nil)
  super(message || detailed_migration_message)
end