Q: Rails how to run rake task How do I run this rake file in terminal/console?
my statistik.rake in lib/tasks
desc "Importer statistikker"
namespace :reklamer do
  task :iqmedier => :environment do
    ...
  end
  task :euroads => :environment do
    ...
  end
  task :mikkelsen => :environment do
    ...
  end
  task :orville => :environment do
    ...
  end
end


A: Rake::Task['reklamer:orville'].invoke

or
Rake::Task['reklamer:orville'].invoke(args)


A: Sometimes Your rake tasks doesn't get loaded in console, In that case you can try the following commands
require "rake"
YourApp::Application.load_tasks
Rake::Task["Namespace:task"].invoke


A: Have you tried rake reklamer:iqmedier ?
My custom rake tasks are in the lib directory, not in lib/tasks. Not sure if that matters.

A: As the https://stackoverflow.com/a/5641807/7262646 and https://stackoverflow.com/a/49400110/7262646 described
you have to add
require 'rake'
Rake::Task.clear
YourAppName::Application.load_tasks

on the top of the file.
YourAppName comes from config/applicaion.rb, which is defined as a namespace, such as:
module YourAppName
  class Application < Rails::Application
  end
end

and then you can use
Rake::Task["task_name"].invoke

to invoke your task.

A: You can run Rake tasks from your shell by running:
rake task_name

To run from from Ruby (e.g., in the Rails console or another Rake task):
Rake::Task['task_name'].invoke

To run multiple tasks in the same namespace with a single task, create the following new task in your namespace:
task :runall => [:iqmedier, :euroads, :mikkelsen, :orville] do
  # This will run after all those tasks have run
end


A: If you aren't sure how to run a rake task, first find out first what tasks you have and it will also list the commands to run the tasks.
Run rake --tasks on the terminal.
It will list the tasks like the following:
rake gobble:dev:prime             
rake gobble:dev:reset_number_of_kits                                    
rake gobble:dev:scrub_prod_data

You can then run your task with: rake gobble:dev:prime as listed.

A: In rails 4.2 the above methods didn't work.


*

*Go to  the Terminal. 

*Change the directory to the location where your rake file is present.

*run rake task_name.

*In  the above case, run rake iqmedier - will run only iqmedir task.

*run rake euroads - will run only the euroads task.

*To Run all the tasks in that file assign the following inside the 
same file and run rake all
task :all => [:iqmedier, :euroads, :mikkelsen, :orville ] do #This will print all the tasks o/p on the screen 
end

