Do rails rake tasks provide access to ActiveRecord models?
Solution 1
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
Solution 2
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)
Solution 3
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.)
Solution 4
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
Solution 5
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
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gmoniey
Updated on December 29, 2020Comments
-
gmoniey over 3 years
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
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irkenInvader over 13 yearsThis will work, but it will break rake in general! After adding this change, try rake -T without a DB available. rake -T should happily provide a list of rake tasks without needing access to the DB!
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Scott Coates over 11 yearswhat does this syntax mean? it's assigning
new_task
to the current environment? what is the current value of:environment
? google is not helping. -
bigpotato about 11 years@scoarescoare :environment here is the dependency, so when running
new_task
, load the environment (load your models) first, and then run new_task. -
Brent about 10 yearsAfter doing this you will find that any other rake tasks that requires initializing the application (i.e. rake assets:precompile) will fail with "rake aborted! Application has been already initialized".
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lazybios about 9 years@scoarescoare you can check custom rake doc,the first example will tell you
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AMBasra over 8 yearshow to achieve same thing in Sinatra ?
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Joshua Grosso Reinstate CMs about 8 yearsCouldn't you just say that
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? -
Kick Buttowski almost 6 yearsmodel name has to follow with all and it does not work without it like TodoList.all.each not TodoList.each idk why it seems working?
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Masroor over 3 yearswhy is creating a namespace required? I wrote a rake task without namespace and I could not access records from my database.