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    Part 2: Core Grails > Controlling application flow

    5. Controlling application flow

    This chapter covers

    • How controllers, models, and views interact

    • Implementing custom URLs and permalinks

    • Writing filter code to reroute requests

    • Using services for more maintainable architecture

    • Data binding and error handling

    • Using Command objects for tricky form validations

    • Uploading and rendering images


    In chapters 3 and 4, we spent plenty of time looking at how Grails handles domain objects. Along the way, we’ve used controllers and implemented a few GSP views to host our forms, but we’ve largely ignored how controllers work. It’s time to set that right.


      

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