rails 4 rake task fails on heroku [uninitialized constant MODEL] -

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i have model screenshot.rb.

defined following rake task

namespace :clean_up_temp   desc "clean unsaved screenshots 1 hours ago"   task :screenshots => :environment     screenshot.destroy_all([ 'created_at<? , title null', 1.hours.ago ])   end    end

it works locally.

failed on heroku

running `rake clean_up_temp:screenshots` attached terminal... up, run.2861 rake aborted! uninitialized constant screenshot /app/lib/tasks/clean_up_temp_screenshots.rake:3:in `block in <top (required)>' /app/lib/tasks/clean_up_temp_screenshots.rake:1:in `<top (required)>' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:641:in `block in run_tasks_blocks' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:641:in `each' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:641:in `run_tasks_blocks' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/application.rb:244:in `run_tasks_blocks' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/engine.rb:446:in `load_tasks' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:30:in `method_missing' /app/rakefile:6:in `<top (required)>' (see full trace running task --trace)

i tried add

config.dependency_loading = true if $rails_rake_task

in production.rb

how can solve problem


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