Turn 1

In the first turn of the request/response cycle, the page with the form is displayed to the user.

• A user opens his browser, types in a URL, and presses Enter.
• When the user presses Enter, the browser sends aGETrequest for that URL.
• TheGETrequest hits the Rails router (config/routes.rb). The router maps the URL to the correct controller action to handle the request.
• The action receives theGETrequest and passes it on to the view.
• The view renders the page as HTML.
• The controller sends the HTML back to the browser. The page loads and the user sees the page with the form.

Turn 2

When a user submits the form, it triggers the second turn of the request/response cycle, where the submitted data is saved into the database.

• The user fills in the form and submits the form.
• When the user submits the form, the browser sends aPOSTrequest to the Rails app.
• ThePOSTrequest hits the Rails router. The router maps thePOSTrequest to the correct controller action.
• The action receives thePOSTrequest. The action retrieves the submitted data from the form, and uses the model to store the data into the database.
• The model completes its task.
• The controller action passes the request on to the view.
• The view renders the page as HTML.
• The controller sends the HTML back to the browser. The page loads and the user sees it.

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