8. Extract Action Logic to Controllers

[agilare]

Separate dependency logic (use app settings to create objects) from action logic (use previously created objects) to perform page actions

Process (from MLAP, p. 144) :

• Find a page script where action logic is still mixed in with the rest of the code.
• In that page script, rearrange the code so that all action logic is in its own central block. Spot check the rearranged code to make sure it still works properly.
• Extract the central block of action logic to a new Controller class, and modify the page script to use the new Controller. Spot check the page script with the Controller in place.
• Write a unit test for the new Controller class and spot check again.
• Commit the new code and tests, push them to the common repository, and notify QA.
• Find another page script with embedded action logic and start again; when all page scripts use Controller objects, we are done.