Unable to change database using Apartment::Tenant.switch!(“db_name”)

I have created multi-tenant application using Apartment Gem, I want to update all records in each databases but when I am trying to switch database using

Apartment::Tenant.switch!("db_one")

and if database not present then it gives error

Error while connecting to tenant db_one FATAL:  database "db_one" does not exist

and if I change another database like db_two then it gives same error

Use block when you are switching database like below:

Apartment::Tenant.switch("db_name") do
   # Your Code
end

remove ! from switch method and use do and end