新手，关于Rake任务语法(Newbie, about Rake task syntax)

新手，关于Rake任务语法(Newbie, about Rake task syntax)

在Rake任务定义中，如下所示：

desc 'SOME description' task :some_task => :environment do # DO SOMETHING end

什么:some_task in task :some_task => :environment意味着什么？

它是在DO SOMETHING部分中调用的方法名称吗？

可以:some_task是描述任务的任意字符串吗？

In Rake task definition, like following:

desc 'SOME description' task :some_task => :environment do # DO SOMETHING end

What does the :some_task in task :some_task => :environment means?

Is it the method name which will be invoked in the DO SOMETHING part?

Can :some_task be any arbitrary string which describe the task?

最满意答案

实际上，当您创建rake任务时， :some_task是您正在调用的任务的名称。

例如，在这种情况下，您将调用rake some_task

您还可以为任务定义名称空间：

namespace :my_tasks do desc "My first task" task :first_task => :environment do # DO SOMETHING end end

然后你将在你的控制台中调用rake my_tasks:first_task 。

希望它能帮助你，

编辑：

正如Holger Just所解释的那样:environment执行“环境”任务，如果你在轨道上，则加载环境。 这可能需要很长时间，但如果您的任务适用于数据库，il也可以帮助您。

In fact, when you're creating a rake task, :some_task is the name of the task you are calling.

For instance, in this case, you will call rake some_task

You also could define namespaces for your tasks :

namespace :my_tasks do desc "My first task" task :first_task => :environment do # DO SOMETHING end end

And then you will call rake my_tasks:first_task in your console.

Hope it will help you,

Edit:

As explained by Holger Just, the :environment executes the "environment" task and if you are on rails, loads the environment. This could take a long time but il also helps you if your tasks works with the database.