This actually has more to do with Rails and/or Sinatra than it does with Heroku. You have to enable IFrame support in your headers explicitly. With Rails you can add this to your config/application.rb file config.action_dispatch.default_headers = ...

If you use the Paypal sandbox you'll notice that there is an IPN Simulator test tool. You must be logged to use it. This tool lets you test an IPN handler script for your application. If your script is not correct and you try to send a test IPN transactio...

Arguably the most important function in the Moodle API, is the create_course function. One would think... after all Moodle is an LMS. Courses are the bread and butter for course management platforms, right? Taking a look at the function in the course/lib....

I usually change some of the default settings when I use the Paperclip plugin. For most of my projects I don't like having separate directories for each image that is uploaded. I prefer, in this instance, to put avatars of different sizes together under o...

I'm a big fan of the yaml_db plugin. But I don't like running rake db:data:load, only to find that my db columns mismatch my model attributes, thus aborting the data import task. To quickly add/remove columns/attributes from a model and rebuild the datab...