17.5. Studio: OMG More ORM!¶
Today’s studio depends on completion of the exercises.
If you have not completed the exercises, go back and complete them before continuing with the studio.
If you want to check out one possible solution to the exercises before you get started, look at the studio16-starter branch in
17.5.1. Adding a ViewModel¶
With the new table set up in our database and our application displaying event categories, we need to add a ViewModel so we can add validation for new event categories.
Create a new ViewModel called
Add one property to your ViewModel for the name of the event category.
Add validation attributes to the property so that it is required and that it has to be between 3 and 20 characters long.
We will be creating 2 new action methods in our controller:
Create() needs to do the following:
EventCategory/Createand returns a view called
Pass a new instance of
ProcessCreateEventCategoryForm() needs to do the following:
POSTrequests at the route of your choosing.
Use error validation and
ModelState.IsValidappropriately. If you want to review how to use
ModelState.IsValid, check out the section on error validation.
Create a new instance of
EventCategoryand add it to the database if the form input meets the validation conditions.
Either reload the form or add a new event category to the database and direct the user back to the
17.5.3. Razor Templates¶
To finish the studio, we need to make a new template,
EventCategory/Create.cshtml, which will contain a form for adding new event categories.
We also need to add links to the pages for all of the events, all of the event categories, and the form to add a new event category to the navbar.
To do so, open up
_Layout.cshtml and scroll down to approximately line 24 where you find the code for the link to add an event:
24 25 26
<li class="nav-item"> <a class="nav-link text-dark" asp-area="" asp-controller="Events" asp-action="Add">Add</a> </li>
Using this code as a template, add links to the
17.5.4. The Final Application¶
Once you are done, launch your app and head to the
If you added categories already, you will see any categories already stored in the database.
If you click on “Create Category”, you should be directed to the
Once you hit submit, you are redirected back to
/EventCategory, and your table now contains the newest event category!