There’s a lot to build on this app, so I’ll break this post into the following sections:
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We will build the Synge Page application to support the needs of video rental stores where customers visit, select DVDs and rent them. A few days later, they returned to return what they had borrowed. This web application should only be used by users of the rental store and this is a requirement that often affects the architecture of the front-end application. Let’s see the requirements with the following screenshots:
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We have all the requirements, now we need to decide on the technology we will use to build our SPA application.
Now that we’ve looked at the application requirements and the technology we’ll use, it’s time to create an integrated, testable and scalable solution. There are two different plans that we will offer here. The first is related to the solution process of the whole project and how it is divided into independent elements. The second is related to the SPA method, i.e. how to configure storage in AngularJS files.
Note that multiple products may or may not be available for each movie. Think of it as having multiple DVDs of the same movie. Films are classified as available or not depending on whether or not there is a stock item. Each customer pays for the product and when he does, the product is not available until he returns it to the store. The tables used in this operation are customers, leases, products. As you can see there are 3 groups of tables, the user, the user and the function of the pretty self-explanatory. We build a single culture system on top of them. Try, I also made an error table to show you how to avoid polluting your code with catch blocks and how to have a central directory in your application.
Time to start building our mutual apps. Create a new empty solution named HomeCinema and add a new class library function named HomeCinema.Entities. We create them first. All our companies implement the IentityBase interface which means they have a set of property IDs and their primary keys in the database. Enter the following interfaces:
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Each movie belongs to a certain genre (film, drama, action, etc.). If we want to retrieve all movies by genre, then we need to add a virtual movie collection.
Movies are the main component of our app. Movies contain information such as title, director, release date, trailer URL (Youtube) or rating. As we have said, every film has many products so we need to add the collection of products to this resource.
Each package describes the DVD itself. It contains a reference to a particular movie and a unique key (code) that uniquely identifies it. For example, when there are 3 DVDs for the same movie, 3 unique codes identify the DVDs. The user chooses between the codes that can be written on the DVD to rent a movie to the customer. Since movie rentals are tied to stock products, the product segment may contain a collection of rental items that are rental items for this product.
The rental office, which defines the DVD rental for one customer, contains information about the customer, the product he chose (DVD and its code), the date of the rental, its status (borrowed or returned, and the date of that day) the customer returned it.
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Now, let’s look at all the aspects related to membership. The first is the role that describes the role of the person who has entered it. Our application will have only administrative roles (Users) but we will discuss our scalability options later if we want customers to use the application. Let me remind you that we will use basic authentication for Web API administrators and multiple controls, and their actions have authorization features and a list of services that are authorized to access their resources.
The user section contains basic information about the user and the most important salt in this salt, which is encrypted by a password.
The last part I added was the bug. It’s always a good idea to log your app’s bugs, and we use a dedicated repository to do this. I decided to add an error log function to show you a nice trick to prevent polluting your controllers by trying to catch blocks everywhere. We’ll see that in action when we get to the Web API Controllers.
Add a new library function named HomeCinema.Data and add a reference to the HomeCinema.Entities function. Make sure you also install the Build Process from the NuGet package. For starters we will create an EF configuration for our component. Create a new folder named Configurations and add the following configuration to declare the primary key for our component:
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Organizational structure assumes that a property named “ID” is the primary key anyway, but it’s a good way to declare this property if you give it a different name. These are the other configurations individually. I will highlight the important lines (if any) to know about each of these.
Those settings affect how database tables are created. Add a new class named HomeCinemaContext to the root of the project. This class inherits from DbContext and will be the main class for accessing data from the database.
Note that I made the decision to name all settings with a free prefix. I removed the default calculation convention that the Design Center uses when creating tables in the database. This results in a table with the same name as the company. If it doesn’t exist, you need to add the App.config file and create the following connection strings:
Let’s move on to the implementation of the UnitOfWork principle. Add a folder named Properties and paste the following classes:
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Time for a collection storage system. We’ve seen this pattern many times on this blog but this time I’m going to make a slight variation. One of the blog readers asked me if I should create a storage class that executes the T storage function every time a new storage type is needed. A reader’s question is very good if you think you may have hundreds of resources and large applications. The answer is no and in this work we will see it in action where we try to turn on the memory T as needed. Create a repository named repository and add the following interface to its implementing class:
Before leaving this job and moving on to one of the jobs, there is only one thing left to do. As I said when I was creating this application, I was creating a database in my SQL server and at the same time adding different things (yes, you can do this too..). There is no migration into the built-in environment. However, I thought I would use them to help you get started and create a database automatically. For this, you will do the same if you follow me. Open the Package Manager, make sure you select the HomeCinema.Data project, and type this command:
This adds the configuration class to the migrations folder. This configuration class contains a seed method that is called when you create a database. The seed formula I wrote is a bit smaller than pasting it here please find it here. What I did was add data for Genres, Movies, Characters, Markets and Stocks. For clients I use a nuget package called MockData so make sure to install it. I set up a user with a home theater username and password. You can use them to enter our SPA. Otherwise, you can register a new user and log in with those credentials. If you want to create a database now, follow these commands from the package manager:
There is a layer between the web application and the database and that is the service layer. In this application, we do it
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