Ahmad Hasan Khan's Profile

When i am running this command on rails 4:

rake mercury_engine:install:migrations

Then I am getting this exception:

rake aborted!
Don't know how to build task 'mercury_engine:install:migrations' (see --tasks)

Does anyone know how to solve it ?

Is this compatible with Rails4 ?

How to show online users ?

I am trying to validate subdomain in Rails 4 but getting exception, can anyone plz help me ?

validates :subdomain, format: { with: /^[a-zA-Z0-9][a-zA-Z0-9.-]+[a-zA-Z0-9]$/ }

Error Message

ArgumentError at /

The provided regular expression is using multiline anchors (^ or $), which may present a security risk. Did you mean to use \A and \z, or forgot to add the :multiline => true option?

I need Help...

http://stackoverflow.com/questions/25843339/rails-app-is-not-working-with-subdomain-on-production