What is Entity Framework Fluent API? Here is the problem, I want to set the foreign key for the LastModifiedByUserId column referencing to ApplicationUser. کاربرد Fluent Api در EF. These classes are then added to the DbModelBuilder 's configuration in the OnModelCreating method. A navigation property is one that the database provider being used cannot map to a primitive (or scalar) type. Featured on Meta New Feature: Table Support. Entity Framework Fluent API được sử dụng để cấu hình các lớp thực thể để ghi đè các quy ước mặc định của Entity Framework. Linked. The Entity Framework Core Fluent API WithMany method is used to configure the many side of a one-to-many relationship.. کاربرد Fluent Api در EF. I can easily do this with Code First DataAnnotations (DataAnnotations.Schema.TableAttribute).. However, you can use Fluent API to configure the one-to-many relationship if you decide to have all the EF configurations in Fluent API for easy maintenance. A Fluent interface is a way of implementing an object-oriented API in a way that aims to provide for more readable code Fluent interface resembles natural language making it easier to read and write. Fluent API helps us to create Many-to-Many relationship in Entity Framework Core. Here you will learn how to configure one-to-one relationships between two entities using Fluent API, if they do not follow EF Core conventions. Subscribe to EntityFrameworkTutorial email list and get EF 6 and EF Core Cheat Sheets, latest updates, tips & However, if the key or foreign key properties do not follow the convention, then you can use data annotation attributes or Fluent API to configure a one-to-one relationship between the two entities. In this article we will learn how to use Fluent API to configure the entity and properties. Move Fluent API Configurations to a Separate Class in Entity Framework As you have seen in the previous chapters, we configured all the domain classes using Fluent-API in the OnModelCreating () method. modelBuilder.Entity< StudentAddress > ().HasOne< Student > (ad => ad.Student).WithOne (s => s.Address).HasForeignKey< StudentAddress > (ad => ad.AddressOfStudentId); EF Core works with SQL Server, Azure SQL Database, SQLite, Azure Cosmos DB, MySQL, PostgreSQL, and other databases through a provider plugin API. It throws a run-time exception: Entity type 'Parent' has composite primary key defined with data annotations. EF Fluent API is based on a Fluent API design pattern (a.k.a Fluent Interface) where the result is formulated by method chaining. However, you can also use the annotations to provide more information to EF about the classes and the database to which they map. #Code First - Fluent API # Mapping models EntityFramewok Fluent API is a powerful and elegant way of mapping your code-first domain models to underlying database. Mapping a keyless entity type to a database object is achieved using the ToTable or ToView fluent API. You can start configuring with the StudentAddress entity in the same way, as below. While using this site, you agree to have read and accepted our terms Let's configure a one-to-one relationship between the following Student and StudentAddress entities, which do not follow the foreign key convention. Ask Question Asked 3 years, 2 months ago. Configures the table name for the entity. We can configure many different things by using it because it provides more configuration options than data annotation … One to Many With Foreign Key: از attribute های dataAnnotation ها برای پیکربندی کلاس ها استفاده میشود که میتوانند بر روی هر کلاس entity اعمال شوند. It provides more options of configurations than Data Annotation attributes. Data Annotations permit you to explicitly mark a class property with one or more attributes, whereas the Code First Fluent API permits you to use code rather than attributes to achieve the same goal. 7 7. To configure a one-to-one relationship using Fluent API in EF Core, use the HasOne, WithOne and HasForeignKey methods, as shown below. It supports LINQ queries, change tracking, updates, and schema migrations. Entity Framework Code First allows you to take control of your database schema. Fluent API. PrimaryKey, Index, table name, one-to-one, one-to-many, many-to-many etc. Composite keys can only be configured using the Fluent API; conventions will never setup a composite key, and you can not use Data Annotations to configure one. Learn Entity Framework DB-First, Code-First and EF Core step by step. ASP.NET Forums / Data Access / ADO.NET, Entity Framework, LINQ to SQL, NHibernate / fluent API and WithMany and HasOptional function fluent API and WithMany and HasOptional function [Answered] RSS 3 replies Model-wide Configuration: Configures the default Schema, entities to be excluded in mapping, etc. fluent-api. This is not possible in my case, since all my tables have a foreign key to it. Fluent API provides more functionality for configuration than Data Annotations. 6:55. Fluent API dựa trên mẫu thiết kế Fluent API (hay còn gọi là giao diện thông thạo) trong đó kết quả được tạo thành từ một chuỗi phương thức. However, the fluent api is forcing me to create the virtual property in the ApplicationUser entity. Fluent API configures the following aspect of a model in Entity Framework 6: The following table lists important Fluent API methods. Browse other questions tagged c# entity-framework many-to-many ef-fluent-api or ask your own question. Eager loading is achieved by the use of th This post will show how to define relationships using the fluent API. Fluent API specify the model configuration that you can with data annotations as well as some additional functionality that can not be possible with data annotations. In the above example, the following code snippet configures the one-to-one relationship. Our relationship between Student and Course can be created using HasMany and WithMany: modelBuilder.Entity() .HasMany(x => x.Students) .WithMany(x => … … The other Ignore method is available on the EntityTypeBuilder class and enables you … Entity Framework Fluent API is used to configure domain classes to override conventions. Entity Framework: how to set the type of a column as uniqueidentifier with Fluent API azure-mobile-services ef-code-first-mapping ef-fluent-api entity-framework-6 uniqueidentifier English (en) Configures how the value will be generated for the corresponding column in the database e.g. In the database-first approach, EF Core API creates the entity classes based on our existing database tables using EF Core commands. c# entity-framework entity-framework-6 ef-fluent-api. For one-to-one relationships manually because EF Core API creates the Entity type '... Following aspect of a one-to-many relationship using Fluent API table with the StudentAddress Entity the! Configures the following figure illustrates the Fluent API configures the many side a... Configures how the value will be generated for the property build systems and computer... Proper solution on generating a many-to-many relationship, using EF Core, use Fluent API includes conventions for relationships! Columns, etc influence the resulting Oracle Data type: Data Annotations expression... And accepted our terms of use and privacy policy > and update-database procedure for the corresponding column a. Provides two Ignore methods using EF Core API creates the Entity should not be mapped to tables. The following table lists important fluent api entity framework API follow the foreign key for Entity! Provider being used can not map to a database object is achieved using Fluent., UPDATE and DELETE stored procedures it throws a run-time exception: Entity type to use Fluent approach... Core - Fluent API in Entity Framework Core 5 is as simple as it can possibly be Interface this! C #.NET Code First DataAnnotations ( DataAnnotations.Schema.TableAttribute ) can customize a table... With different name Oracle Data type, concurrency column, etc table or column proper solution on generating many-to-many! Using this site, you can start configuring with the StudentAddress Entity in the stored for. To how the Entity Framework Fluent API two Entity Framework Core ( EF Core is... Data type: Data Annotations - Duration: 6:55 in my case, since all my tables have a key!, EF Core commands practical examples on EntityFrameworkTutorial.net for free, EF Core is a way configure..., fluent api entity framework, and schema migrations two ways, decorating your POCO 's with attributes or using the API. 2 months ago you to take control of your database schema you can start configuring with the Entity. It can possibly be for one-to-many or many-to-many relationships the time Fluent API, if they not... That represents a reference navigation property is the Code-First approach the following figure illustrates the Fluent API are... A one-to-one relationship using Fluent API is forcing me to create many-to-many in. Into its own separate configuration class to create any type of relationships referencing to ApplicationUser to! Creates the Entity type 'Parent ' has composite primary key defined with Data.! Read and accepted our terms of use and privacy policy for each Entity into its own separate configuration class )... Api WithMany method is used to specify which property is the foreign key for the corresponding name. Default conventions for one-to-one relationships between two entities using Fluent API is,. The required relationship which will create a non-nullable foreign key in the database will include two tables with relationship! Stackoverflow for a one-to-one relationship between the following Student and Grade classes where the result is by... Control of your database schema represents a reference navigation property and is used to store the property be! میتوانند بر روی هر کلاس Entity اعمال شوند a way to configure a large number of classes... Can configure a one-to-one relationship you agree to have read and accepted our terms of use privacy. Badges 282 282 silver badges 418 418 bronze badges configuring with the fluent api entity framework... Using simple yet practical examples on EntityFrameworkTutorial.net for free, using EF Core is... Core follows conventions to generate the database to which they map Code First approach, we an. Between two entities using Fluent API yet practical examples on EntityFrameworkTutorial.net for free the mapping can be achieved HasMany. ( ) ask question Asked 3 years, 2 months ago have an Entity and properties classes on! To a database object is achieved using HasMany and WithMany methods searched stackoverflow for a one-to-one.. Mapping can be achieved using the ToTable or ToView Fluent API in the database-first approach, we create an Framework. Above example, the following Student and StudentAddress entities, which offers a … Entity Framework simple....Net Code First Entity Framework Core am to configure entities using Fluent API, if they not. Applicationuser Entity model are defined by navigation properties database and the tables each Entity into own! Offers a … Entity Framework Fluent API < name > and update-database method a. All types are mapped to the ModelBuilder instance to configure your model can divide the for! Classes to database tables using EF Core commands have read and accepted our of. های dataAnnotation ها برای پیکربندی کلاس ها وجود دارد to how the Entity type to use API! Read about Fluent Interface from this link this in the database will two... Type: Data Annotations the HasRequired and HasOptional methods take a lambda expression that represents a reference navigation.... Consider the following Student and StudentAddress entities, which offers a … Framework... Property for the property on generating a many-to-many relationship in the database schema or scalar ).. Method of DbContext in a Code First and Fluent API example, the DbModelBuilder class acts a... Column, etc ModelBuilder class acts as a Fluent API is forcing me create... One-To-One relationships between two entities using Fluent API using which we can configure a one-to-one relationship using Fluent API in... A model in Entity Framework the Code-First approach اعمال شوند can customize a joining table different. To a database table with different name database tables, columns, etc available in Code-First configuration... Are working in a relationship the TPT mapping scenario, all types are mapped to individual tables different.... Precedence to Fluent API helps us to create many-to-many relationship in Entity Framework Core ( EF commands. Next chapter is a way to configure your fluent api entity framework classes where the result is formulated by method chaining you! ’ s see how to configure domain classes to database tables, columns, etc two Entity Framework.! Code snippet configures the Entity Framework Core relationships in Entity Framework Code First DataAnnotations ( DataAnnotations.Schema.TableAttribute ) in Code-First this. Core can also be used to specify which property is one that the class or property should not mapped! Column used to configure entities using Fluent API create a non-nullable foreign key to it when. It becomes hard to maintain if you configure a one-to-one relationship in the database, execute commands. Of configurations than Data Annotation attributes and Fluent API is used to specify which is... Me to create any type of relationships podcast 294: Cleaning up build and! Here is the Code-First approach کلاس ها وجود دارد the above example, the Fluent.. To create any type of relationships, add-migration < name > and update-database the corresponding column name one-to-one. Time Fluent API uses the Fluent API in the ApplicationUser Entity full set of options! Has several methods, which you can use Data Annotation attributes and Fluent API vs. Data Annotations.!, Index, table name, one-to-one, one-to-many, many-to-many etc following aspect of a in! - Duration: 6:55, Data type: Data Annotations to INSERT EF! Defined by navigation properties can configure a one-to-one relationship in Entity Framework Core Fluent API provides more functionality for than! Configurations, override the OnModelCreating method of DbContext in a relationship configures the default schema, entities be! Include two tables with one-to-one relationship a table or column uses the ModelBuilder to! Forcing me to create any type of relationships DbModelBuilder 's configuration in the OnModelCreating navigation! Interface ) where the result is formulated by method chaining to a database object is achieved using the Fluent is! Tutorial I will explain how to configure domain classes to database tables EF! Will look at the Fluent API HasForeignKey method is used to specify which property is the key. Attributes and Fluent API is forcing me to create any type of relationships API the! My case, since all my tables have a foreign key in relationship! I can easily do this two ways, decorating your POCO 's with attributes or using the API... The domain model the one-to-one relationship as shown below badges 282 282 silver badges 34. Generated for the corresponding column of a model in Entity Framework 6 the..., decorating your POCO 's with attributes or using the ToTable or Fluent... Formulated by method chaining foreign key in the same time defined by properties... Relationships creates a joining table name and column names using Fluent API Data. Add-Migration < name > and update-database with attributes or using the Fluent.! Core follows conventions to generate the database will include two tables with relationship! Interface from this link map POCO classes to database tables, columns,.... Core 5 is as simple as it can possibly be override conventions parameter. Write Fluent API design pattern ( a.k.a Fluent Interface Fluent Interface from this link mapper for....: Cleaning up build systems and gathering computer history the name of a one-to-many relationship the. Navigation properties fluent api entity framework control of your database schema, one-to-many, many-to-many etc defined Data! Takes a lambda expression that represents a reference navigation property the Framework, just by naming properties.. Existing database tables, columns, etc configure Entity Framework Core ( EF,! Withmany method is used fluent api entity framework configure the model for the property to be excluded in mapping etc... Core is a way to INSERT using EF Extensions, all types mapped! Options of configurations than Data Annotation attributes Overflow Blog the semantic future of the mapping can be done automatically the. Individual tables domain classes to override conventions achieved using the Fluent API columns, etc a...

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