run rake task inside rails application - ruby-on-rails

Question

I want to run asset precompile task inside the rails application,As I had many dependencies who will change the code,in that case all the time whenever they change i need to run the script as I cant give server access to them so I am providing the GUI for them from that they alone can run the script,so,I have built UI to run the task with some parameter like
system("Template='#{params[:template]}' Theme='#{params[:theme]}' rake assets:precompile)
I am getting two values from UI(params[:template],params[:theme]).Another thing i want to run this task in another path(site path) means Admin side UI is there that task should execute in Site directory,
if(params[:theme_script] == "true")
template=Template.where(:name => params[:template]).first
if template
theme = template.themes.where(:name => params[:theme]).first
if theme
# Dir.chdir "#{THEMEPATH}"do
# `Template="#{template.name}" Theme="#{theme.name}" rake assets:precompile`
# end
# sleep 10
# system("#{Rails.root.to_s}/lib/shell_script.sh")
# RunRake.run_rake(template.name,theme.name)
# Dir.chdir "#{THEMEPATH}"do
# Rake::Task['assets:precompile'].invoke
# end
ENV["Template"] = template.name
ENV["Theme"] = theme.name
precompile_task = "bundle exec rake assets:precompile --trace 2>&1"
output = Dir.chdir(THEMEPATH) { %x[ #{precompile_task} ] }
flash[:notice] = "Asset created successfully"
else
flash[:notice] = "U have enter invalid data"
end
else
flash[:notice] = "U have enter invalid data"
end
end
This is my code am checking multiple condition and am allowing to execute the task.
I have tried this code by putting in controller and lib, but this is not working.
I have tried with shell script also.
Could please anyone can help me.

Answer 1

You can just setup an environment variable for rails, and then issue #invoke method from a controller. So, prepare the files:
gemfile
gem 'rake'
config/initializers/rake.rb:
Rake.load_rakefile Rails.root.join( 'Rakefile' )
app/controllers/your_controller:
ENV["Template"] = template.name
ENV["Theme"] = theme.name
Rake::Task[ 'assets:precompile' ].invoke
Issue bundle install, then run console rails c, and type:
Rake::Task.tasks.map(&:name).grep 'assets:precompile'
# => ["assets:precompile"]
As you can see, the task assets:precompile is loaded successfully. Then just issue the action for the controller.
To run the task for an other rails app you shell run also the other ruby instance, similar to as you had done:
system( "other_app_run.sh '#{template.name}' '${theme.name}'" )
other_app_run.sh:
#!/bin/bash
source "$HOME/.rvm/scripts/rvm"
cd /other/app/path
export Template="$1"
export Theme="$2"
rake assets:precompile