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how to run rake tasks asynchronously from controllers by spawning child processes
class ApplicationController < ActionController::Base
private
# Runs a rake task asyncronously in a child process
#
# for example, in any controller:
# async_rake("async:import_fixtures")
# async_rake("db:maintenance:cleanup", table: "things", ids: [12, 114, 539])
#
# Options will be converted to strings and passed as unix env variables.
# The rake tasks will then be responsible of retrieving and parsing them
# (e.g. if they are supposed to be collections).
#
def async_rake(task, options = {})
options[:rails_env] ||= Rails.env
# format the options as unix environmental variables
env_vars = options.map { |key, value| "#{key.to_s.upcase}='#{value.to_s}'" }
env_vars_string = env_vars.join(' ')
log_file = File.join(Rails.root, "log/async_rake.#{Rails.env}.log")
# fire and forget
Process.fork {
exec("#{env_vars_string} bin/rake #{task} --trace 2>&1 >> #{log_file}")
}
# or:
# system("#{env_vars_string} bin/rake #{task} --trace 2>&1 >> #{log_file} &")
end
end
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