Rails: Make this rake task aware that it is in the test environment

问题

I have the following rake task defined in my lib/tasks folder:

namespace :db do
  namespace :test do
    task :prepare => :environment do
      Rake::Task["db:seed"].invoke
    end
  end
end

Now, what this does is seed the test DB when I run rake db:test:prepare. I do this because I have some basic records that must exist in order for the app to function, so they're not optional and can't really be mocked.

Separately, I have a model that uses S3 for asset storage in development and production, but I don't want it to use S3 for testing. I have set up a method in the model that changes the storage path from S3 to local if Rails.env.test?

However, this isn't working. I was wondering if the rake task was aware of what environment it was being called from, and it turns out it is NOT. I put this at the top of my seeds.rb file:

puts "Environment Check: Rails Environment = #{Rails.env}"

Sure enough, when the task runs this prints: Environment Check: Rails Environment = development

So, how can I redo this rake task so that when it's seeding the test DB it knows that it's seeding the test DB??

回答1:

I was having this problem too; in my db/seeds.rb file I have a block that creates user accounts in the development environment, but they were also being created when preparing the test environment to run rake for RSpec or Cucumber testing, which resulted in a wall of red.

Updated: I've found that the best way to specify the environment for rake tasks is to specify the environment within the task, above all statements that need the environment to be set. So in this case:

Rails.env = 'test'
Rake::Task["db:seed"].invoke

does the job.

回答2:

From reading the db:test tasks's source, it looks like they only care about grabbing the test db info from database.yml, but don't care which actual environment they're doing it under.

You might need to run rake db:test:prepare RAILS_ENV=test to ensure you're under the test environment.

来源：https://stackoverflow.com/questions/5525757/rails-make-this-rake-task-aware-that-it-is-in-the-test-environment