Suggestions for rendering views O.K. on big changes

Lets say I am modifying an already existing web application and I want to change my data architecture and rename my People model to User. Now, I have about 100 pages that reference the People model, I would have to change that to reference User. So I will go in there and make those changes, but I may have forgotten a couple or accidentally skipped some, is there any framework or a way to automate that every page in the app still renders correctly? (Without throwing and error)