CODEWITHSUNDEEP
rubyrake
krunal shah
krunal shah

Reputation: 16339

how to pass multiple parameters to rake task

I want to pass multiple parameter but I don't know the numbers. Such as model names. How do I pass those parameters into a rake task and how do I access those parameters inside the rake task.

Like, $ rake test_rake_task[par1, par2, par3]

Upvotes: 35

Views: 28376

Answers (5)

Henry Collingridge
Henry Collingridge

Reputation: 1970

Rake supports passing parameters directly to a task using an array, without using the ENV hack.

Define your task like this:

task :my_task, [:first_param, :second_param] do |t, args|
  puts args[:first_param]
  puts args[:second_param]
end

And call it like this:

rake my_task[Hello,World]
=> Hello
   World

This article by Patrick Reagan on the Viget blog explains it nicely

Upvotes: 64

Ardee Aram
Ardee Aram

Reputation: 4789

You can use args.extras to iterate over all the arguments without explicitly stating how many parameters you have.

Example:

desc "Bring it on, parameters!"
task :infinite_parameters do |task, args| 
    puts args.extras.count
    args.extras.each do |params|
        puts params
    end         
end

To run:

rake infinite_parameters['The','World','Is','Just','Awesome','Boomdeyada']

Output:

6
The
World
Is
Just
Awesome
Boomdeyada

Upvotes: 74

Gautam
Gautam

Reputation: 4026

Found this example on this blog post and the syntax seems a bit cleaner.

For example, if you had a say_hello task, you could call it with any number of arguments, like so:

$ rake say_hello Earth Mars Venus

This is how it works:

task :say_hello do
  # ARGV contains the name of the rake task and all of the arguments.
  # Remove/shift the first element, i.e. the task name.
  ARGV.shift

  # Use the arguments
  puts 'Hello arguments:', ARGV

  # By default, rake considers each 'argument' to be the name of an actual task. 
  # It will try to invoke each one as a task.  By dynamically defining a dummy
  # task for every argument, we can prevent an exception from being thrown
  # when rake inevitably doesn't find a defined task with that name.
  ARGV.each do |arg|
    task arg.to_sym do ; end
  end

end

Upvotes: 10

Sergei
Sergei

Reputation: 107

Use args.values.

task :events, 1000.times.map { |i| "arg#{i}".to_sym } => :environment do |t, args|
  Foo.use(args.values)
end

Upvotes: 9

lest
lest

Reputation: 8100

You may try something like that:

rake test_rake_task SOME_PARAM=value1,value2,value3

And in rake task:

values = ENV['SOME_PARAM'].split(',')

Upvotes: 12

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