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ASP.NET MVC Forms

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Updating Our Controller to Handle Deletes

5:01 with James Churchill

As the first step in setting up our “Delete Entry” page, we’re ready to update our controller to handle deletes.

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git checkout tags/v5.3 -b updating-our-controller-to-handle-deletes

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    We're almost done. 0:00
    Let's see how to delete entries. 0:02
    Here's our entries list page. 0:04
    When we click on an entry's delete button, we're making a GET request for 0:06
    our delete page. 0:10
    As you can see, there's not much here right now. 0:11
    We'll finish this page in this video. 0:14
    Let's take a look at our controller's delete action method. 0:16
    We can see here that it's currently ensuring that we have an ID 0:26
    parameter value and then returning the view. 0:30
    Should we update this action method to delete the specified entry? 0:33
    No it's not a good idea for a GET request to change data. 0:37
    Performing a GET request should always be a safe action to make. 0:40
    Instead, our delete action method will return a view that will allow the user 0:45
    to review the entry and confirm that they want to delete it clicking on that 0:50
    views delete button will make a post request to the server to delete the entry. 0:54
    Go ahead and stop the app like we did in an earlier video. 0:59
    Let's think through the changes that we need to make to our controller and 1:03
    add to do comments. 1:06
    First we need to retrieve the entry for the provided ID parameter value. 1:08
    To do, retrieved entry for 1:14
    the provided ID parameter value. 1:18
    And return not found if an entry wasn't found. 1:24
    Return not found if an entry wasn't found, 1:28
    then pass the entry to the view. 1:35
    Pass the entry to the view. 1:45
    We also need a delete post action method so lets stub that method out. 1:48
    First, this method should only accept post request. 1:54
    So start with the [HttpPost] attribute. 1:57
    Then the signature for our method, public ActionResult 2:01
    Delete(int id). 2:07
    Notice that we're just accepting an integer parameter value 2:13
    instead of an entry model instance. 2:16
    To delete an entry we just need the ID, not the whole model. 2:19
    Inside of the action method, we need to do two things. 2:23
    One, delete the entry. 2:27
    TODO Delete the entry. 2:30
    And two, redirect the user to the entries list page. 2:33
    TODO Redirect to the "Entries" list page. 2:38
    Now let's implement our to dos. 2:46
    Starting with our delete get action method, we need to retrieve the entry for 2:50
    the provided ID parameter value. 2:54
    We've seen that code before. 2:57
    Entry, entry, equals entries 2:58
    repository, get entry int id. 3:05
    And then we need to return not found if an entry wasn't found. 3:11
    We've seen that code before too. 3:15
    If entry equals equals null 3:19
    return HTTP not 3:22
    found and lastly we need to pass the entry to the view. 3:28
    That's easy to do too just pass the entry variable to our view method call. 3:34
    Hey, we're on a roll. 3:42
    Now for our delete post action method. 3:44
    To delete the entry, we just need to call the repositories delete method. 3:51
    EntriesRepository.DeleteEntry. 3:55
    Then we need to redirect the user to the entries list page 4:04
    by returning a call to the RedirectToAction method. 4:08
    And that completes 4:11
    the changes to our 4:16
    controller. 4:21
    Nice job, let's make sure that our project can successfully build 4:26
    by pressing Ctrl+Shift+B. 4:29
    And here in the output window, we can see that our project was successfully built. 4:32
    If you're using GitHub, let's commit our changes. 4:37
    Enter a commit message of updated the controller 4:44
    to support the delete page and click the commit all button. 4:49
    Now we need to work on the view which we'll do after the break. 4:58

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