ruby - 无法将 args 传递给 rake 任务 - 语法是否已更改？

Question

我正在使用具有 rake (0.9.2.2) 的 Rails 3.1.3 项目。我想在 rake 任务中这样做:像这样调用它

rake tale:import_kml /path/to/file.txt

然后在 rake 任务中，以 args.filename 访问“/path/to/file.txt”

我以为我可以这样做(puts 用于一些调试):

namespace :tale do
  desc "Expects to get a file or folder name as the first argument, and passes that to Tale.import_kml"
  task(:import_kml, [:filename] => :environment) do |t, args|
    puts "args = #{args.inspect}"
    if File.exists?(args.filename)
      Tale.import_kml(filename)
    end
  end
end

但是，我明白了:

** Invoke tale:import_kml (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute tale:import_kml
args = {}
rake aborted!
can't convert nil into String

所以，文件名没有进入参数。我不知道我在这里做错了什么......

Answer 1

试试这样的片段:

namespace :tale do
  desc "Expects to get a file or folder ..."
  task(:import_kml, [:filename]) do |t, args|
    args.with_default(:filename => :environment)
    puts "args = #{args.inspect}"
  end
end

rake tale:import_kml[foo]  # => args = {:filename => "foo"}