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Entity Framework with ASP.NET MVC

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Reviewing the Comic Book Artists Repository

3:36 with James Churchill

Let's review my solution for moving the comic book artist related repository methods to their own repository class.

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To follow along committing your changes to this course, you'll need to fork the dotnet-comic-book-library-manager repo. Then you can clone, commit, and push your changes to your fork like this:

git clone <your-fork>
cd dotnet-comic-book-library-manager
git checkout tags/v3.5 -b reviewing-the-comic-book-artists-repository

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    How did it go? 0:00
    Were you able to move the comic book artists related repository methods 0:01
    to their own repository class? 0:05
    Let's walk through my solution. 0:07
    I started by adding the class named ComicBookArtistsRepository 0:09
    to the class library's data folder. 0:13
    To which I added a private field for the context instance and 0:15
    a constructor that accepts a context instance, and 0:19
    initializes the private field to that instance. 0:22
    I then moved the GetComicBookArtist, AddComicBookArtist, and 0:25
    DeleteComicBookArtist methods from the Repository class to 0:29
    the ComicBookAristRepository class. 0:33
    And added the using directives for the comic book shared models and 0:38
    system data entity name spaces. 0:42
    After I move the methods to the new class, 0:49
    I renamed the GetComicBookArtist method to Get. 0:52
    The AddComicBookArtist method to Add, and 1:03
    the DeleteComicBookArtist method to Delete. 1:06
    That keeps the entity type focused repositories 1:12
    following the same method naming convention. 1:15
    Then I moved on to the ComicBookArtistsController class and 1:18
    added a private field from the new repository and 1:21
    instantiated an instance of it in the constructor. 1:24
    Then I finished up by fixing the build errors in the controller. 1:40
    Repository.AddComicBookArtist became _comicBookArtistsRepository.Add. 1:46
    Repository.GetComicBookArtist became _comicBookArtistRepository.Get. 1:58
    Repository.DeleteComicBookArtist became _comicBookArtistsRepository.Delete. 2:10
    Once the project was successfully building again, I ran the web app and 2:18
    tested each page. 2:22
    Remember, it's okay if you did things slightly differently than I did. 2:31
    There's often more than one way to do something. 2:35
    Let's take a closer look at our two entity type focused repositories. 2:38
    I'll open them and place them in side by side tabs. 2:42
    They both contain private fields for their context instances and initialized 2:48
    those fields using a constructor that accepts a context instance. 2:52
    They also both contain a Get method, 3:00
    though the signature of those methods differ slightly. 3:02
    The CRUD related methods are also very similar, 3:06
    basically just varying by the entity type they're operating against. 3:08
    So our repository classes look very similar to each other. 3:16
    Which might make you wonder if there's a way that we can reduce some of this 3:20
    very close to the same code. 3:24
    While still retaining our entity type focused repositories. 3:25
    Well, it turns out there is something that we can do. 3:29
    We'll see exactly what in the next video. 3:33

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