How to run rake task?

Question

I have an existing .rake file. It used to have one task and I added one more task to the existing rake file.

But when I try to run, it throws an error:

rake aborted!
Don't know how to build task ___ 

abc.rake file:

namespace abcd
  namespace abcde
    task pqr do
      ------------------
    end

    task mno do ( new task which I added)
     ---------------------
    end
  end
end

But when I used command: rake abcd:abcde:mno -- it showed above error

So I used rake -T -A , I am able to see the rake task abcd:abcde:pqr but am unable to see the other one.

I am new to rails. Please help me out.

Thanks in advance.

Answer 1

In Rails 6.x you have to use rails instead of rake. The example from user400617 above

namespace :abcd do
  namespace :abcde do

     task :pqr do
       puts 'Inside PQR'
     end

     task :new_added_task do
       puts 'Inside New Added Task'
     end

     task :mno => [:new_added_task]  do
       puts 'Inside Mno'
     end

   end
end

would be run like this

rails abcd:abcde:pqr           #  Output => Inside PQR 

rails abcd:abcde:mno           #  Output => Inside New Added Task
                              #            Inside Mno

rails abcd:abcde:new_added_task  # Output => Inside New Added Task

Took me a while to figure this out.