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I'm trying to pass arguments to a Rake task and access my model as mentioned in " How to pass command line arguments to a rake task " and " Do rails rake tasks provide access to ActiveRecord models? ". However adding => :environment to this code: require 'rake' namespace :genre do desc "Add a genre" task :add, :genre_id, :name => :environment do |t, args| puts args.name end end Gives me this error when I run the task: rake genre:add['1','Abc'] rake aborted! undefined method `map' for :name:Symbol (See full trace by running task with --trace) If I delete => :environment it works just fine. UPDATE: TRACE: rake --trace genre:add['1','Abc'] rake aborted! undefined method `map' for :name:Symbol /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:254:in `set_arg_names' /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task_manager.rb:29:in `define_task' /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:310:in `define_task' /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/dsl_definition.rb:32:in `task' /private/var/www/html/someapp.com/subdomains/someapp.heroku.com/someapp/lib/tasks/genre.rake:5:in `block in <top (required)>' /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task_manager.rb:207:in `in_namespace' /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/dsl_definition.rb:102:in `namespace' /private/var/www/html/someapp.com/subdomains/someapp.heroku.com/someapp/lib/tasks/genre.rake:3:in `<top (required)>' /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/

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