我正在写一个由参数组成的任务的Rake脚本.我想出了如何传递参数,以及如何使任务依赖于其他任务.
task :parent,[:parent_argument1,:parent_argument2,:parent_argument3] => [:child1,:child2] do # Perform Parent Task Functionalities end task :child1,[:child1_argument1,:child1_argument2] do |t,args| # Perform Child1 Task Functionalities end task :child2,[:child2_argument1,:child2_argument2] do |t,args| # Perform Child2 Task Functionalities end
>我可以将参数从父任务传递给子任务吗？
>有没有办法让孩子的任务是私人的,所以不能独立调用？
解决方法
我实际上可以想到在Rake任务之间传递参数的三种方式.
>使用Rake对参数的内置支持：
# accepts argument :one and depends on the :second task.
task :first,[:one] => :second do |t,args|
puts args.inspect # => '{ :one => "one" }'
end
# argument :one was automagically passed from task :first.
task :second,:one do |t,args|
puts args.inspect # => '{ :one => "one" }'
end
$rake first[one]
>通过Rake::Task#invoke直接调用任务：
# accepts arguments :one,:two and passes them to the :second task.
task :first,:one,:two do |t,args|
puts args.inspect # => '{ :one => "1",:two => "2" }'
task(:second).invoke(args[:one],args[:two])
end
# accepts arguments :third,:fourth which got passed via #invoke.
# notice that arguments are passed by position rather than name.
task :second,:third,:fourth do |t,args|
puts args.inspect # => '{ :third => "1",:fourth => "2" }'
end
$rake first[1,2]
>另一个解决方案是将猕猴补丁的主要应用对象Rake::Application
并使用它来存储任意值：
class Rake::Application attr_accessor :my_data end task :first => :second do puts Rake.application.my_data # => "second" end task :second => :third do puts Rake.application.my_data # => "third" Rake.application.my_data = "second" end task :third do Rake.application.my_data = "third" end $rake first