Do rails rake tasks provide access to ActiveRecord models?
I am trying to create a custom rake task, but it seems I dont have access to my models. I thought this was something implicitly included with rails task.
I have the following code in lib/tasks/test.rake:
namespace :test do
task :new_task do
puts Parent.all.inspect
end
end
And here is what my parent model looks like:
class Parent < ActiveRecord::Base
has_many :children
end
It's a pretty simple example, but I get the following error:
/> rake test:new_task
(in /Users/arash/Documents/dev/soft_deletes)
rake aborted!
uninitialized constant Parent
(See full trace by running task with --trace)
Any ideas? Thanks
Figured it out, the task should look like:
namespace :test do
task :new_task => :environment do
puts Parent.all.inspect
end
end
Notice the => :environment dependency added to the task
you might need to require your configuration (which should specify all your required models etc)
eg:
require 'config/environment'
alternatively you can just require each seperately, but you might have environment issues AR not set up etc)
When you begin writing your rake tasks, use a generator to stub them out for you.
For example:
rails g task my_tasks task_one task_two task_three
You'll get a stub created in lib/tasks called my_tasks.rake (obviously use your own namespace.) Which will look like this:
namespace :my_tasks do
desc "TODO"
task :task_one => :environment do
end
desc "TODO"
task :task_two => :environment do
end
desc "TODO"
task :task_three => :environment do
end
end
All your rails models etc. will be available for the current environment from within each task block, unless you're using the production environment, in which case you need to require the specific models you want to use. Do this within the body of the task. (IIRC this varies between different versions of Rails.)
environment is required as a dependency and then say the syntax rather than encouraging the OP to rely on "magic" utilities that don't even use any magic?
With the new ruby hash syntax (Ruby 1.9) the environment will be added like this to the rake task:
namespace :test do
task new_task: :environment do
puts Parent.all.inspect
end
end
Generate task using below command (namespace with task name):
rails g task test new_task
Use below syntax to add logic:
namespace :test do
desc 'Test new task'
task new_task: :environment do
puts Parent.all.inspect
end
end
Run above task using below command:
bundle exec rake test:new_task
or
rake test:new_task
The :environment dependency is quite correctly called out, but rake still may not know about other gems that your models depend on - in one case of mine, 'protected_attributes'.
The answer is to run:
bundle exec rake test:new_task
This guarantees that the environment includes any gems specified in your Gemfile.
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new_taskto the current environment? what is the current value of:environment? google is not helping.new_task, load the environment (load your models) first, and then run new_task.