mirror of https://github.com/abpframework/abp
#313: Create the Book entity.
Halil ibrahim Kalkan
7 years ago
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## Application Services
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TODO
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## ASP.NET Core MVC Tutorial - Part I
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TODO
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> This tutorial assumes that you have created a new project, named `Acme.BookStore` from [the startup templates](https://abp.io/Templates).
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### About the Tutorial
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In this tutorial series, you will build an application that is used to manage a list of books & their authors. **Entity Framework Core** (EF Core) will be used as the ORM provider (as it comes pre-configured with the startup template).
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### Solution Structure
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This is the layered solution structure created from the startup template:
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### Create the Book Entity
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Define [entities](../../Entities.md) in the **domain layer** (`Acme.BookStore.Domain` project) of the solution. The main entity of the application is the `Book`:
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````C#
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using System;
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using System.ComponentModel.DataAnnotations;
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using System.ComponentModel.DataAnnotations.Schema;
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using Volo.Abp.Domain.Entities;
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namespace Acme.BookStore
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{
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[Table("Books")]
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public class Book : AggregateRoot<Guid>
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{
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[Required]
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[StringLength(128)]
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public string Name { get; set; }
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public BookType Type { get; set; }
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public DateTime PublishDate { get; set; }
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public float Price { get; set; }
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}
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}
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````
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* ABP has two fundamental base classes for entities: `AggregateRoot` and `Entity`. **Aggregate Roots** are one of the concepts of the **Domain Driven Design (DDD)**. See [entity document](../../Entities.md) for details and best practices.
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* Used **data annotation attributes** in this code. You could use EF Core's [fluent mapping API](https://docs.microsoft.com/en-us/ef/core/modeling) instead.
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#### BookType Enum
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The `BookType` enum used above is defined as below:
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````C#
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namespace Acme.BookStore
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{
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public enum BookType : byte
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{
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Undefined,
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Advanture,
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Biography,
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Dystopia,
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Fantastic,
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Horror,
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Science,
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ScienceFiction,
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Poetry
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}
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}
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````
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#### Add Book Entity to Your DbContext
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EF Core requires to relate entities with your DbContext. The easiest way is to add a `DbSet` property to the `BookStoreDbContext` as shown below:
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````C#
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public class BookStoreDbContext : AbpDbContext<BookStoreDbContext>
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{
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public DbSet<Book> Book { get; set; }
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...
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}
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````
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* `BookStoreDbContext` is located in the `Acme.BookStore.EntityFrameworkCore` project.
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#### Add new Migration & Update the Database
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Startup template uses [EF Core Code First Migrations](https://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/) to create and maintain the database schema. Open the **Package Manager Console (PMC)**, select the `Acme.BookStore.EntityFrameworkCore` as the **default project** and execute the following command:
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This will create a new migration class inside the `Migrations` folder. Then execute the `Update-Database` command to update the database schema:
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````
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PM> Update-Database
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````
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#### Add Sample Data
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`Update-Database` command created the `Books` table in the database. Enter a few sample rows, so you can show them on the page:
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### Create the Application Service
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The next step is to create an [application service](../../Application-Services.md) to manage (create, list, update, delete...) books.
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TODO...
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