Hello,
The new Ruby on Rails 0.14.1 release supports a lib/tasks/ directory
where you place *.rake files that get imported after RoR's rake
definitions. In 0.13.1, I needed to override some of the targets, such
as :clone_structure_to_test, with my own specific code, and I would just
edit the Rakefile.
After doing the 0.14.1 and merging in a ton of changes, I thought, there
has to be a better way, so I can leave a vanilla RoR Rakefile alone and
still have my own custom targets.
I first tried just defining the same clone_structure_to_test task, but
when I ran it, it ran the original RoR task and my new version, not what
I wanted :)
What I came up was this code, which clears out the original task and
creates a brand new one.
# Rake allows the same task name to be specified multiple times, where
# each successive task definition appends to a list of actions to
# perform. Therefore, an application specific task cannot redefine a
# previously defined task. These methods here allow tasks to be
# redefined and renamed.
module Rake
class Task
# Clear all existing actions for the given task and then set the
# action for the task to the given block.
def self.redefine_task(args, &block)
task_name, deps = resolve_args(args)
TASKS.delete(task_name.to_s)
define_task(args, &block)
end
end
end
# Clear all existing actions for the given task and then set the
# action for the task to the given block.
def redefine_task(args, &block)
Rake::Task.redefine_task(args, &block)
end
# Alias one task name to another task name. This let's a following
# task rename the original task and still depend upon it.
def alias_task(new_name, old_name)
Rake::Task::TASKS[new_name.to_s] =
Rake::Task::TASKS.delete(old_name.to_s)
end
This way, in a new lib/tasks/clone_structure_to_test.rake, I can use this:
# Delete the original clone_structure_to_test task and create a new
# one that uses the SQL DDL files to set up the database.
desc "Faster replacement for the original :clone_structure_to_test"
redefine_task :clone_structure_to_test => :environment do
abcs = ActiveRecord::Base.configurations
`psql --quiet -U "#{abcs["test"]["username"]}" -f db/create.sql
#{abcs["test"]["database"]}`
end
It would be great if something like this made it into the next Rake release.
Regards,
Blair
--
Blair Zajac, Ph.D.
<[EMAIL PROTECTED]>
Subversion and Orca training and consulting
http://www.orcaware.com/svn/
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