So I was getting some "Uninitalized constants" on my rake task, and I did some googling and found that the environment variable needed to be loaded in. However im also using a command line argument and im not sure if the positioning is correct or what:
desc "Wipes Specific User"
task :clean_user => environment [:user] do |t, args|
puts "Running clean_user for #{args[:user]}..."
Core::Stuff.find(args[:user]).wipe_user
end
Without the environment variable somewhere I get complains about Core::Stuff being uninitialized, but Im trying to pass :user via CL. (This is just a sample rake task to make sure stuff works).
Am I missing something?
edit: Fixing the issue with:
task :clean_user, [:user] => :environment however now it seems to be loading my PATH into the argument (I get an error complaining how "Core::Stuff cannot find a user id with id of "" . So it's like it's using my CL path as the ID?
The docs in the gem specify:
task task_name, arguments => dependencies
That means your code needs to be:
task :clean_user, [:user] => :environment do |t, args|
Related
I have a instance variable in my controller that queries my table for a value, and I need to send that value through to my rake task.
So here are the 2 relevant lines in my controller:
#turl = Fteam.where(:id => #ids).select(:TeamUrl)
system "rake updateTm:update[#turl]"
Here is my rake file:
desc "Import Players"
task :update, [:Tmurl] => :environment do |t, args|
require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'mechanize'
agent = Mechanize.new
puts "This is the selected Team URL: #{args.Tmurl}"
end
end
This is what the rake task returns:
This is the selected Team URL: #turl
My guess is that the controller is not passing the variable correctly. So how can I pass the actual value of the variable to the rake task so the output is correct?
probably you may need to use interpolation
"rake updateTm:update[#{#turl}]"
It is a .rb file. and and in ruby we can'y call variable directly.
You should use
system "rake updateTm:update[#{#turl}]"
Thanks for all the help and ideas everyone, i came up with a solution.
Instead of #turl = Fteam.where(:id => #ids).select(:TeamUrl)
I changed that to #turl = Fteam.where(:id => #ids).pluck(:TeamUrl)
That gave me the actual value that i needed rather then the active record, which was causing the error because it could not pass a value for which it could not translate or understand.
I have seen the other posts but I am still having trouble. Below is my code. I have several rake tasks where I pass in zero, one or even five arguments. What am I missing?
namespace :my_namespace do
desc 'shows user accounts within the database for the specified customer.'
task :show_user_accounts, [:customer_id] => :environment do |t, args|
cust = Customer.find( args.customer_id.to_i )
cust.users.each do |user|
puts "User Name: #{user.name}\tUser ID: #{user.id}\t"
end
end
end
I am running the task with the following command:
$ rake my_namespace:show_user_accounts customer_id=110
Error:
rake aborted!
Couldn't find Customer with id=0
After much searching around I found that not only did the syntax for a rake task change, but the execution syntax did as well. So, the code of my rake task (above) is correct but my invocation was wrong.
The correct way for running above rake task is:
$ rake my_namespace:show_user_accounts[110]
I found the answer here: http://www.redconfetti.com/2012/01/example-rake-task/
In Rake task definition, like following:
desc 'SOME description'
task :some_task => :environment do
# DO SOMETHING
end
What does the :some_task in task :some_task => :environment means?
Is it the method name which will be invoked in the DO SOMETHING part?
Can :some_task be any arbitrary string which describe the task?
In fact, when you're creating a rake task, :some_task is the name of the task you are calling.
For instance, in this case, you will call rake some_task
You also could define namespaces for your tasks :
namespace :my_tasks do
desc "My first task"
task :first_task => :environment do
# DO SOMETHING
end
end
And then you will call rake my_tasks:first_task in your console.
Hope it will help you,
Edit:
As explained by Holger Just, the :environment executes the "environment" task and if you are on rails, loads the environment. This could take a long time but il also helps you if your tasks works with the database.
With your example, you define a task called some_task which can be invoked by calling rake some_task on the command line.
It will depend on the environment task which will be rune before your new some_task. In rails, the environment task sets up the rails environment (loading libraries, preparing database connection, ...) which is quite expensive and thus optional.
This question already has answers here:
How to pass command line arguments to a rake task
(20 answers)
Closed 5 years ago.
I am able to pass in arguments as follows:
desc "Testing args"
task: :hello, :user, :message do |t, args|
args.with_defaults(:message => "Thanks for logging on")
puts "Hello #{args[:user]}. #{:message}"
end
I am also able to load the current environment for a Rails application
desc "Testing environment"
task: :hello => :environment do
puts "Hello #{User.first.name}."
end
What I would like to do is be able to have variables and environment
desc "Testing environment and variables"
task: :hello => :environment, :message do |t, args|
args.with_defaults(:message => "Thanks for logging on")
puts "Hello #{User.first.name}. #{:message}"
end
But that is not a valid task call. Does anyone know how I can achieve this?
Just to follow up on this old topic; here's what I think a current Rakefile (since a long ago) should do there. It's an upgraded and bugfixed version of the current winning answer (hgimenez):
desc "Testing environment and variables"
task :hello, [:message] => :environment do |t, args|
args.with_defaults(:message => "Thanks for logging on")
puts "Hello #{User.first.name}. #{args.message}" # Q&A above had a typo here : #{:message}
end
This is how you invoke it (http://guides.rubyonrails.org/v4.2/command_line.html#rake):
rake "hello[World]"
For multiple arguments, just add their keywords in the array of the task declaration (task :hello, [:a,:b,:c]...), and pass them comma separated:
rake "hello[Earth,Mars,Sun,Pluto]"
Note: the number of arguments is not checked, so the odd planet is left out:)
TLDR;
task :t, [args] => [deps]
Original Answer
When you pass in arguments to rake tasks, you can require the environment using the :needs option. For example:
desc "Testing environment and variables"
task :hello, :message, :needs => :environment do |t, args|
args.with_defaults(:message => "Thanks for logging on")
puts "Hello #{User.first.name}. #{args.message}"
end
Updated per #Peiniau's comment below
As for Rails > 3.1
task :t, arg, :needs => [deps] # deprecated
Please use
task :t, [args] => [deps]
Just for completeness, here the example from the docs mentioned above:
task :name, [:first_name, :last_name] => [:pre_name] do |t, args|
args.with_defaults(:first_name => "John", :last_name => "Dough")
puts "First name is #{args.first_name}"
puts "Last name is #{args.last_name}"
end
Notes:
You may omit the #with_defaults call, obviously.
You have to use an Array for your arguments, even if there is only one.
The prerequisites do not need to be an Array.
args is an instance of Rake::TaskArguments.
t is an instance of Rake::Task.
An alternate way to go about this: use OS environment variables. Benefits of this approach:
All dependent rake tasks get the options.
The syntax is a lot simpler, not depending on the rake DSL which is hard to figure out and changes over time.
I have a rake task which requires three command-line options. Here's how I invoke it:
$ rake eaternet:import country=us region=or agency=multco
That's very clean, simple, and just bash syntax, which I like. Here's my rake task. Also very clean and no magic:
task import: [:environment] do
agency = agency_to_import
puts "Importing data for #{agency}..."
agency.import_businesses
end
def agency_to_import
country_code = ENV['country'] or raise "No country specified"
region_slug = ENV['region'] or raise "No region specified"
agency_slug = ENV['agency'] or raise "No agency specified"
Agency.from_slugs(country_code, region_slug, agency_slug)
end
This particular example doesn't show the use of dependencies. But if the :import task did depend on others, they'd also have access to these options. But using the normal rake options method, they wouldn't.
While these solutions work, in my opinion this is overly complicated.
Also, if you do it this way in zsh, you'll get errors if the brackets in your array aren't escaped with '\'.
I recommend using the ARGV array, which works fine, is much simpler, and is less prone to error. E.g:
namespace :my_example do
desc "Something"
task :my_task => :environment do
puts ARGV.inspect
end
end
then
rake my_example:my_task 1 2 3
#=> ["my_example:my_task", "1", "2", "3"]
The only thing you need to keep in mind is that ARGV[0] is the process name, so use only ARGV[1..-1].
I realize that strictly speaking this does not answer the question, as it does not make use of :environment as part of the solution. But OP did not state why he included that stipulation so it might still apply to his use case.
When I run a rake task for an application that uses Models defined in a plugin I get an Uninitialized Constant error, but when I run the model process, with script/runner, that is fired in the rake task then the job runs fine?
Is there some difference between script/runner that loads all my plugins that doesn't happen when I fire up a rake task even though it is being passed an environment?
Your rake task needs to be dependent upon :environment. That will spin up your app's environment and give you access to your models, etc.
Eg
desc "Make DB Views"
task :views => [:environment] do |t|
# your task's code
end
You need to specify that your Rake task requires the environment to be loaded:
task :your_task => :environment do |t| ...
or
task :your_task => [:environment] do |t| ...
or
task :your_task, :param1, :param2, :needs => :environment do |t, args| ...
or
task :your_task, :param1, :param2, :needs => [:environment] do |t, args| ...
If you did specify this, then there is another problem. I think one common source of errors is due to the fact that the plugins are loaded inside a namespace called Rails::Plugin. So if you defined a class called Foo in your plugin, then the Rake task needs to reference it as Rails::Plugin::Foo instead of simply Foo.
If this does not solve your problem then try to add puts "Check" on the first line of the plugin's init.rb file, and make sure that Check is displayed when you run your rake task. If it is, then your plugin is being loaded, but perhaps it fails silently after that.
One last thing: maybe you are trying to use the plugin outside the task, for example at the beginning of your Rake file, in some initialization code? If so, then it will fail because the plugins only get loaded when the task is executed (when the environment is loaded).
Hope this helps.