Combining many rake tasks into one rake task

问题:

Instead of running each rake task individually like this:

rake db:drop
rake db:create
rake db:migrate
rake db:load

I want to run one rake task that does all for.

This is what I have for my rakefile:

desc 'This rebuilds development db'
namespace :rebuild_dev do
 Rake::Task["db:drop"].execute
 Rake::Task["db:create"].execute
 Rake::Task["db:migrate"].execute
 Rake::Task["db:load"].execute
end

The above doesn't work when I run it.

回答1:

You want invoke not execute. A little excerpt from my own code showing how to pass variables:

namespace :clients do

  task :create, [:client] => ["clients:creation:checks"] do |t, args|
    Rake::Task["clients:creation:git"].invoke(client, password)
    Rake::Task["server:virtualhost:create"].invoke(client)
    Rake::Task["server:virtualhost:enable"].invoke(client)
    Rake::Task["server:reload"].invoke
    Rake::Task["db:roles:create"].invoke(client, password)
    Rake::Task["db:create"].invoke(client, client)
    Rake::Task["db:migrate"].invoke(client)
  end

end

Alternatively, you can make the task depend upon another task as I have done above with :create depending upon clients:creation:checks.

Just to clarify, a namespace is for grouping tasks, so you must actually define the tasks within the namespace as I have above. You can't simply call tasks from within a namespace.

So your code above should be:

desc 'This rebuilds development db'
task :rebuild_dev do
  Rake::Task["db:drop"].invoke
  Rake::Task["db:create"].invoke
  Rake::Task["db:migrate"].invoke
  Rake::Task["db:load"].invoke
end

回答2:

You can do it with dependencies on a task with no body.

desc 'This rebuilds development db'
task :rebuild_dev => ["db:drop", "db:create", "db:migrate", "db:load"]

回答3:

namespace :rebuild_dev do
 desc 'This rebuilds development db'
  task :clean_slate => :environment do 
    Rake::Task["db:drop"].invoke
    Rake::Task["db:create"].invoke
    Rake::Task["db:migrate"].invoke
    Rake::Task["db:load"].invoke
  end
end