How can I pass parameters to a Rake task invocation in a way that works?

Question

I'm using the Seed Dump gem to dump some seed data to db/seeds.rb. Except, I need to run a one-line task after I dump these three tables.

The way I invoke db:seed:dump is this:

zeus rake db:seed:dump MODELS=Standard,Category,Brand

So I tried to override this as follows in lib/tasks/database.rake:

namespace :db do namespace :seed do task(:dump_setup => :environment) do Rake::Task["db:seed:dump"].invoke(:models => "Standard,Category,Brand") puts "did it." end end end

I have also tried:

namespace :db do namespace :seed do task(:dump_setup => :environment) do Rake::Task["db:seed:dump"].invoke(:models => ['Standard','Category','Brand']) puts "did it." end end end

I just have the "did it" there as a placeholder until I get this working.

That invocation is not working. It's dumping hundreds of megabytes from my database. Dumping everything.

The work I've done above is based on the most popular answers I have found here. Not sure why it's working.

Oooh I have a gem that I could publish where you can just dump all from anywhere (irb, wherevs) also, it add's method a dump method to all active record objects so that you can just do Model.dump and it dumps to seeds.rb? Would that be something you might be interested in if I published it? — Drew
– Drew, Commented Jan 7, 2014 at 21:05
That sounds interesting Drew, I think you would have some takers on that. — RubyRedGrapefruit
– RubyRedGrapefruit, Commented Jan 8, 2014 at 14:12

user229044 · Accepted Answer · 2014-01-07 21:08:59Z

zeus rake db:seed:dump MODELS=Standard,Category,Brand

MODELS is an environment variable. You need to set the environment variable via ENV before invoking the dependent task:

ENV['MODELS'] = 'Standard,Category,Brand`

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