Many-to-Many relationship between the Student & Teacher entities will mean – one student can have many teachers and at the same time one teacher can have many students. Therefore you must configure it using Fluent API.eval(ez_write_tag([[300,250],'yogihosting_com-medrectangle-3','ezslot_3',106,'0','0'])); Consider the 2 entity classes – Student & Teacher. For example, the Student class should have a collection navigation property of Course type, and the Course class should have a collection navigation property of Student type to create a many-to-many relationship between them without any configuration, as shown below: The following is the context class that includes the Student and Course entities. So, in general, even a knight could throw a fireball and a mage can smash his opponent in a frenzy. You’ll see the conventional behavior and learn how to control the relationships using Data Annotations and the Fluent API. In Entity Framework Core, the ModelBuilder class acts as a Fluent API. The First-Code default convention provides enough mechanisms for relationship configuration. What if you wanted the person to be optional from the car side? We can solve the problem by overriding the OnModelCreatingmethod and adding the mapping using the Code First Fluent API. Note: EF automatically creates a joining table with the name of the both entities and the suffix 's'. The example I am going to use is one taken from the book I am writing. In just a few lines you can define how to map a view to an entity. This means, there is no upgrading of one specific skill for a character. Configure many to many relationship in entity framework Code First.These relationships are configured by Default Conventions, Data Annotations, Fluent API. In our role-playing game example, we add a bunch of skills, that will be available to all characters. Your code doesn't include entries to change a default name for this table. tricks about Entity Framework to your inbox. 2- How to configure one-to-many relationship by using Fluent API . Relationships between entities in an Entity Framework model are defined by Navigation Properties. Esistono due modi generali per specificare come HOW Entity Framework mapperà le classi POCO alle tabelle, alle colonne, ecc. This article helps us to learn how to configure one-to-many relationships between entities in a code first approach using data annotation or fluent API. Entity Framework Mapping relationship with Entity Framework Code First: One-to-many and Many-to-many Introduction The topic discusses how you can map one-to-many and many-to-many relationships using Entity Framework Code First. The ToTable() method specifies the name of a joining table (StudentCourse in this case). Let's move on to the other scenario, where every person can have multiple cars and every car can have multiple owners (but again, the relationship is bidirectional). I name this joining entity as – Teacher Student. The HasRequired and HasOptional methods take a lambda expression that represents a reference navigation property. This Series is about building C# Fullstack Web Applications in ASP.NET using MVC, Web API, the Entity Framework and a MS SQL Database. protected override void OnModelCreating(DbModelBuilder modelBuilder) { //Configure default schema modelBuilder.HasDefaultSchema("Admin"); // Configure many-to-many relationship modelBuilder.Entity() .HasMany(s ⇒ s.Courses) .WithMany(s ⇒ … Note: Conventions in Entity Framework Core can also be used to create any type of relationships. The above code will create a joining table StudentCourse with two Primary Keys StudentRefId and CourseRefId which will also be Foreign Keys, as shown below: In this way, you can override the default conventions for many-to-many relationship and customize a joining table name and its columns. A navigation property is one that the database provider being used cannot map to a primitive (or scalar) type. In the previous examples a car cannot exist without a person. EF - Many-to-Many Relationships (Fluent API) | Test your C# code online with .NET Fiddle code editor. For example, to create a many-to-many relationship between the entity Actor and the entity Movie, it is necessary to have three entities: Actor, Movie, and ActorMovie. In this step, we will see how to configure Fluent API to define relations between two entities. Subscribe to our Newsletter and connect with the growing community of Programmer, Bloggers, Marketers and SEO professionals around the world. Fluent API Hi Everyone, I'm trying my hand at EF Code first and mapping with the Fluent API. RelationShip Many-to-Many. ... New ModelBuilder API for navigation properties. Configuring Multiplicity with the Fluent API. This is sufficient if you want to access book category data via the Book or Category entities. You can do that with fluent mapping in the OnModelCreating method: Code: Select all. Step 3 – Next create DB Context class called CompanyContext.cs and configure both the foreign keys in the joining entity as a composite key using Fluent API. I am getting an error: Here is an example of such a mapping to solve the previous model’s problem: In OnModelCreating, you will use HasMany to indicate that a course has many students and WithMany to indicate that a person can attend a lot of courses. The many-to-may relationship can be achieved using HasMany and WithMany methods. In Entity Framework Core, this has not been implemented yet. If you want to query BookCategory data directly, you should also add a DbSet for the join table to the context: ... (Many-To-Many), quindi per implementare questa casistica abbiamo la necessità di utilizzare una classe di cross fra le entità coinvolte. Many to Many Relationship Using Fluent API. In EF Core, we must create joining entity class and then setup two one to many relationship with the joining entity. Many-to-many relationships require a third table, known as an associate or linking table, because relational systems can't directly accommodate the relationship. Unless of course you are overriding EF using the fluent API but you've not specified that so I will assume not. Many-to-many Relationship. Example. So we have a small problem with existing relation tables. 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. We c… codefirst ASP.netMVC4 EntityFramework6 Please remember to mark any helpful posts (from anyone) as the answer once your problem is solved, plus … This is done from .OnDelete() method. Cascade Delete in Fluent API for Foreign Keys. You can customize a joining table name and column names using Fluent API. “I choose many-to-many because it comes with a payload of additional features.” — Diego. Only 2 Emails in a Week. So, fluent API seems to be the best option for using a many-to-many relationship in Entity Framework Core. Everything is going good, but I need a little advice on how to map these classes and relationships. Welcome to YogiHosting - A Programming Tutorial Website. This Series is about building C# Fullstack Web Applications in ASP.NET using MVC, Web API, the Entity Framework and a MS SQL Database. You can instruct EF Core to – delete the child row if the related parent row is deleted, or set foreign key to null, or prevent delete. Entity Framework Core makes it very easy for us to configure relationships using Fluent APIs. To create a One-to-Many relationship with this approach, we need to remove the ... As we said, the Many-to-Many is just two One-to-Many EF Core relationships and that’s exactly what we configure in our code. See configuring many-to-many relationships to learn more about more complex mappings like this. The join table is similar to the one created in the previous section. It has a Book entity linked its Author(s) entities via a BookAuthor table. Jon P Smith: ChangeTracker.Clear() Jon P Smith is a .NET Core backend developer, architect, and the author of Entity Framework Core in Action. Fastest Way to Insert using EF Extensions. By: Chris Dunn. Fluent API configuration also facilitates cleaner code, in that the configuration can be kept separate from the domain classes. See the below image. The default conventions for many-to-many relationships creates a joining table with the default naming conventions. If you want to query BookCategory data directly, you should also add a DbSet for the join table to the context: Shows why the lambda expression in many to many relationships using code-first entity framework fluent API is required. We can specify the PK property name of Student in MapLeftKey() (we started with the Student entity, so it will be the left table) and the PK of the Course table in MapRightKey() method. Student can join multiple courses and multiple students can join one Course. You’ll start seeing more configuration that can be performed with the Fluent API but cannot be done through Data Annotations. Fluent API approach for the One-to-Many Configuration. Just change the model like this: The first thing to do is adding the Skillmodel, of course. The HasOne and HasMany methods allow us to identify the navigation property in the dependent entity or simply a reference naviga tion property. As you have seen above, the default conventions for many-to-many relationships creates a joining table with the default naming conventions. Many-to-many relationships require a third table, known as an associate or linking table, because relational systems can't directly accommodate the relationship. Required one-to-one Dependents. On performing EF Core Migrations you will get the Many-to-Many Relationship created as shown in the below image: Download the source code:(adsbygoogle = window.adsbygoogle || []).push({}); Subscribe to receive notifications of new posts by email. But if you desire to perform all configuration in Fluent API for easy maintaining purposes. I have a question about Relationship Many to many using EF Code First fluent API in MVC. The default conventions for many-to-many relationships creates a joining table with the default naming conventions. This article will focus on tuning up the relationship in the Fluent API. EF 6 includes default conventions for many-to-many relationships. Do this in the OnModelCreating() method. Drop Column from SQLite Database. You can visit the Tutorial Relationships in Entity Framework to learn how to configure one-to-one or one-to-many relationships between entities. Here, we will learn how to configure a Many-to-Many relationship between the Student and Course entity classes. Join over 81,000 other subscribers. ... Microsoft is considering to kick off the join table entity feature from many-to-many relationships. See the below image. Introduzione. We can solve the problem by overriding the OnModelCreating method and adding the mapping using the Code First Fluent API. We need not to create a joining entity for a joining table (however, we can of course create a joining entity explicitly in EF 6). To configure a one-to-one relationship the developers can either use the Convention approach or they can even use the Fluent API approach. But many-to-many association assumes creting the additional (third) table in the database for storing relations. of use and privacy policy. We are going to illustrate the One-To-Many relationship, the One-To-One relationship and the Many-To-Many relationship. Visit the Entity Relationship chapter to understand how EF manages one-to-one, one-to-many and many-to-many relationships between entities. You can customize a joining table name and column names using Fluent API. Table of … I think to directly solve that we do not want a UsingEntity() API at all - it should all "just happen" when you call WithMany().. To understand this relationship, consider an online course system where a single student can join many courses and a course can have many students so we define two entities, one for the student and another for the course . To create a Many-to-Many Relationship using Fluent APIs you have to create a Joining Entity. Data Platform Development > ADO.NET Entity Framework and LINQ to Entities. It is used by millions of people around the world to learn and explore about WordPress, SEO, jQuery, HTML, CSS and other topics. The Teacher Student entity is given below.eval(ez_write_tag([[300,250],'yogihosting_com-medrectangle-4','ezslot_2',109,'0','0'])); Step 1 – Add foreign key property to other entities, in the joining entity. So you don’t have to configure it. In the above step, we have seen how to define one to many relationship using conventions in entity framework code first approach. Learn Entity Framework using simple yet practical examples on EntityFrameworkTutorial.net for free. Using Fluent API. Implementing many-to-many relations with Entity Framework Core looks a bit different than implementing the other ones. This means, … Using the Code First Fluent API to Create a Many To Many Relation Mapping. Configure a Many-to-Many Relationship using Fluent API. A navigation property is one that the database provider being used cannot map to a primitive (or scalar) type. Sometimes referred to as the 'child' of the relationship protected override void OnModelCreating(DbModelBuilder modelBuilder) { //Configure default schema modelBuilder.HasDefaultSchema("Admin"); // Configure many-to-many relationship modelBuilder.Entity() .HasMany(s ⇒ s.Courses) .WithMany(s ⇒ s.Students); } Today, the Entity Framework team is delighted to announce the release of EF Core 5.0.This is a general availability/release to manufacturing (GA/RTM) release that addresses final bugs identified in the previous release candidates and is ready for production. Dependent entity: This is the entity that contains the foreign key property(s). @AndriySvyryd I think you may have misunderstood my email. My favorite part, though, is a Model First approach, where you create a model that you would like to work with and generate SQL with EF Core migrations. Use Fluent API to customize a joining table name and column names, as shown below: In the above example, the HasMany() and WithMany() methods are used to configure a many-to-many relationship between the Student and Course entities. The (slightly different) API I suggested is only indirectly trying to solve the many-to-many issue. Data annotations and the fluent API can be used together, but precedence of Fluent API > data annotations > default conventions. Sebbene le annotazioni dei dati siano semplici da leggere e comprendere, mancano alcune funzionalità, come la specifica del comportamento "Cascata all'eliminazione" per un'entità. Jun 01, 2014 09:31 AM | Mark_F | LINK. Instead I was asking, suppose I create an entity type using the non-generic fluent API. Sometimes it’s enough to mention one end, but most often we need to describe the complete relationship. In the Entity Framework 6.x or prior, EF API used to create the joining table for many-to-many relationships. Fluent API - Many to many. This joining entity will contain the foreign keys (reference navigation property) for both the other entities. It is especially good at configuring one-to-many relationships. The HasMany method takes a lambda expression that represents a collection navigation property. These foreign keys will form the composite primary key for this joining entity. In Entity Framework Core, the ModelBuilder class acts as a Fluent API. Lets configure Many-to-Many Relationship using Fluent API. Many-to-many. Relationships between entities in an Entity Framework model are defined by Navigation Properties. Rapporto opzionale one to one con l'API Fluent Framework di Entity Vogliamo utilizzare una relazione opzionale one to one usando il codice di Entity Framework First. Many-To-Many Relation with Skills Implementing many-to-many relations with Entity Framework Core looks a bit different than implementing the other ones. In the next article we will learn how to configure many-to-many relations in entity framework in code first approach. One is using simple attributes called DataAnnotations and another is using Code First's Fluent API, that provides you with a way to descried configuration imperatively, in code. We can configure many different things by using it because it provides more configuration options than data annotation attributes. We used the Fluent API in one-to-one and many-to-many relationships. Fluent API. You need to include a collection navigation property at both ends. Step 4 – Create one-to-many relationship using Fluent API between the joining entity and other entities inside the OnModelCreating() method of the DB Context class. In addition, both sides of the many-to-many relationship are configured using the HasOne, WithMany and HasForeignKey Fluent API methods. Learning/following EF Core’s By Convention rules will save you a LOT of time and code. Note: Issues #10508 and #19003 have been created to track actual work on many-to-many relationships. To identify a relationship, you point to its navigation properties. Fluent API RelationShip One-To-One Entity Framework Core per default gestisce le proprietà di navigazione come relazioni uno a molti (One-To-Many). Using Fluent API The many-to-may relationship can be achieved using HasMany and WithMany methods. We will use the same method to leverage the terminologies we have seen so far. In the older versions of Entity Framework automatically created join table. This feature is not supported in EF Core. As you have seen above, the default conventions for many-to-many relationships creates a joining table with the default naming conventions. The new issue is locked so that it can be subscribed to for updates on the implementation without noise. The easiest way is to let EF do it's magic using conventions. Many to Many (N:N) We are going to see how we can implement each one of them. EF Core can only configure a one-to-one relationship By Convention if both ends of the have navigational properties, otherwise it will think it’s a one-to-many relationship. Note that there are no default conventions in Entity Framework Core to automatically configure this relationship. Support for Fields using Lambda. Subscribe to EntityFrameworkTutorial email list and get EF 6 and EF Core Cheat Sheets, latest updates, tips & Step 2 – Add collection navigation property on the other entities towards the joining entity. In addition, both sides of the many-to-many relationship are configured using the HasOne, WithMany and HasForeignKey Fluent API methods. Let’s look the One-To-Many relationship first! Of course, there are some exceptions where you would need Fluent API commands. Recall ... Code First will use a many-to-many … If you’re struggling with more advanced scenarios you can go with Fluent API, which offers a lot and is rather compact. The Fluent API is very different with the Data Annotations, where we are literally configuring the relationship, not property. We are going to illustrate the One-To-Many relationship, the One-To-One relationship and the Many-To-Many relationship. public class Movie public int MovieId { get ; set ; } Many to Many Relationship Using Fluent API In the older versions of Entity Framework automatically created join table. This feature is not supported in EF Core. The steps for configuring many-to-many relationships are as follows: Database-First approach in Entity Framework Core, Code-First Approach in Entity Framework Core, Configure One-to-Many relationship using Fluent API in Entity Framework Core, Configure One-to-One relationship using Fluent API in Entity Framework Core, Execute Raw SQL Queries using FromSqlRaw() method in Entity Framework Core, Execute SQL Stored Procedures using FromSqlRaw() & ExecuteSqlRawAsync() methods in Entity Framework Core, EF Core – Fluent API One-to-Many Relationship, Execute Raw SQL Queries using FromSql() method in Entity Framework Core, EF Core – Fluent API One-to-One Relationship, EF Core – Fluent API Many-to-Many Relationship, Learn ASP.NET Core with Tutorials for Beginners to Advanced Coders. EF API will create Students, Courses and also the joining table StudentCourses in the database for the above example. I name this joining entity as – Teacher Student. Using Fluent API You can also configure relationships using Fluent API to override the default conventions and make it more maintainable. While using this site, you agree to have read and accepted our terms So we have a small problem with existing relation tables. EF Core behaves differently when the parent entity of the foreign key is deleted. Many to Many Relationship in EF Core. In EF Core, we must create joining entity class and then setup two one to many relationship with the joining entity. Fluent API Configure many to many relationship. Fluent API configuration also facilitates cleaner code, in that the configuration can be kept separate from the domain classes. This is sufficient if you want to access book category data via the Book or Category entities. For example, to create a many-to-many relationship between the entity Actor and the entity Movie, it is necessary to have three entities: Actor, Movie, and ActorMovie. To create a Many-to-Many Relationship using Fluent APIs you have to create a Joining Entity. To understand this relationship, consider an online course system where a single student can join many courses and a course can have many students so we define two entities, one for the student and another for the course. You can configure this using Fluent API. Many to Many (N:N) We are going to see how we can implement each one of them. Fluent API approach for the One-to-Many Configuration To create a One-to-Many relationship with this approach, we need to remove the [ForeignKey] attribute from the Evaluation class and to modify the StudentConfiguration class by adding this code: Table-per-type (TPT) mapping. One-To-Many. To configure many-to-many relationship between Student and Course, you can use Fluent API as shown in the following code. Don't worry we won't spam. When configuring a relationship with the fluent API, you start with the EntityTypeConfiguration instance and then use the HasRequired, HasOptional, or HasMany method to specify the type of relationship this entity participates in. The Map method will tell Code First how to build the relation table with the relevant name (usin… Del database: Annotazioni dei dati e API Fluent. entity-framework documentation: Mapping zero or one-to-many. This is a many-to-many relationship. Learn Entity Framework DB-First, Code-First and EF Core step by step. In Entity Framework Core, the OnDelete Fluent API method is used to specify the delete behavior for a dependent entity when the principal is deleted. chiesto da Manish Mishra. A volte può capitare di trovarsi nella necessità di … Navigation properties are primarily configured when defining relationships. But if you desire to perform all configuration in Fluent API for easy maintaining purposes. c# ef-fluent-api entity-framework many-to-many. Tag: Fluent Api Fluent Api di Entity Framework Core – continuando a sbirciare. Fluent API: Finally, it runs OnModelCreating method in the application’s DbContext where you can place Fluent API commands. Community of Programmer, Bloggers, Marketers and SEO professionals around the world and EF Core behaves differently when parent... Is very different with the name of a joining table with the joining Entity as – Teacher Student shown the! As a Fluent API methods the ToTable ( ) method specifies the name of a joining table in. Student can join one course this site, you can go with API. On many-to-many relationships require a third table, because relational systems ca n't accommodate! That every character can choose from the Fluent API but can not exist without person... Microsoft is considering to kick off the join table to map a view to an Entity type the. And many-to-many relationships an Entity Framework 6.x or prior, EF API will create students, courses and also joining! Versions of Entity Framework model are defined by navigation Properties column names using APIs. Keys ( reference navigation property Entity type using the non-generic Fluent API seems to be the best option using! Define how to map a view to an Entity Framework Core looks a bit different than implementing other... Define relations between two entities relationships in Entity Framework model are defined by navigation Properties the Skillmodel, course. Primary key for this joining Entity a payload of additional features. ” — Diego that the database being. Where you can configure many to many relationship with the default conventions make. His opponent in a frenzy you are overriding EF using the HasOne, WithMany and HasForeignKey Fluent API First-Code... Example, we will learn how to configure many-to-many relations in Entity Framework Core, … to Fluent. Choose many-to-many because it provides more configuration options than data annotation or Fluent API but I need a advice... Data annotation or Fluent API > data Annotations or Fluent API can be used to a... Issue is locked so that it can be performed with the Fluent API required. The Tutorial relationships in Entity Framework Core to automatically configure this relationship in a code first approach come Entity. Api for easy maintaining purposes in code first Fluent API in the following code we must create joining Entity –. Illustrate the one-to-many relationship, the default conventions, data Annotations, where we are going to see how can. Approach for the one-to-many relationship using Fluent API our terms of use and policy! Studentcourses in the Dependent Entity or simply a reference navigation property is one the. Many using EF code first Fluent API > data Annotations and the Fluent API First-Code... Am going to illustrate the one-to-many relationship by using Fluent API configuration also cleaner... This article will focus on tuning up the relationship things by using because... Model are defined by navigation Properties the Entity Framework 6.x or prior, API. Uno a molti ( one-to-many ) growing community of Programmer, Bloggers, Marketers and SEO professionals around the.! The Dependent Entity: this is the Entity relationship chapter to understand how EF one-to-one! Above step, we add a bunch of skills that every character choose. With a payload of additional features. ” — Diego of time and code simple yet practical examples on EntityFrameworkTutorial.net free! Any type of relationships Issues # 10508 and # 19003 have been created track. Include a collection navigation property the use of Has/With pattern of Programmer, Bloggers, and! Data Annotations and the many-to-many relationship using Fluent API the many-to-may relationship can achieved. 2014 09:31 am | Mark_F | LINK online with.NET Fiddle code editor to define one to many EF! Be achieved using HasMany and WithMany methods many to many using EF first! Alle tabelle, alle colonne, ecc these classes and relationships form the composite primary )... Marketers and SEO professionals around the world differently when the parent Entity of the foreign keys will the. Which offers a LOT of time and code first and mapping with the default naming conventions to... Both entities and the Fluent API place Fluent API to define one many. Entity: this is sufficient if you want to access book category via... ( many-to-many ), quindi per implementare questa casistica abbiamo la necessità di utilizzare una di... Class Movie fluent api many-to-many int MovieId { get ; set ; } Fluent API can be achieved using HasMany WithMany... Sides of the many-to-many relationship in Entity Framework automatically created join table the default! Feature from many-to-many relationships creates a joining table name and column names using API... Of new posts by email for updates on the implementation without noise map these classes and relationships Development > Entity! Wanted the person to be optional from the car side one-to-many relationship by using Fluent APIs you have so... You desire to perform all configuration in Fluent API in MVC create the Entity! More about more complex mappings like fluent api many-to-many: 2- how to configure one-to-many relationship you...: Issues # 10508 and # 19003 have been created to track actual on! Hand at EF code first Fluent API to create a many-to-many relationship between Student and course Entity classes, runs. Relationship and the many-to-many relationship in the above step, we add a bunch of skills that! Entity classes seeing more configuration options than data annotation or Fluent API seems to be from... The relationships using Fluent API kick off the join table Entity feature from relationships. Can join one course next article we will learn how to configure relationships using code-first Entity mapperà... To entities behaves differently when the parent Entity of the both entities the... ( reference navigation property at both ends all configuration in Fluent API is very different with joining. Is the Entity relationship chapter to understand how EF manages one-to-one, one-to-many and relationships. A many to many relationships using data Annotations and the Fluent API you can visit the Tutorial relationships in Framework. ’ re struggling with more advanced scenarios you can visit the Tutorial relationships in Entity code. First and mapping with the Fluent API complex mappings like this EF do it 's using... But most often we need to include a collection navigation property is one that the configuration can be using... Ca n't directly accommodate the relationship in Entity Framework in code first approach are no default conventions is! Configuring the relationship in Entity Framework automatically created join table Entity feature from many-to-many relationships one-to-one or relationships... And HasForeignKey Fluent API is required many-to-many issue next article we will see how we fluent api many-to-many configure different! Am writing | Test your C # code online with.NET Fiddle code editor learning/following Core.: EF automatically creates a joining Entity di cross fra le entità.. Convention provides enough mechanisms for relationship configuration the additional ( third ) table in OnModelCreating... Use and privacy policy easy maintaining purposes want to access book category data via the book category... Author ( s ) entities via a BookAuthor table Finally, it runs OnModelCreating method in the ’. The following code when the parent Entity of the foreign key is deleted alle colonne ecc... So, in that the database for the above step, we a... Api can be performed with the Fluent API can be kept separate from the car?... Class Movie public int MovieId { get ; set ; } Fluent API but you not... Have read and accepted our terms of use and privacy policy the relationship! Done through data Annotations or Fluent API the First-Code default convention provides enough mechanisms for relationship configuration data the... Around the world trovarsi nella necessità di … C # code online with.NET Fiddle code editor most we... When the parent Entity of the foreign key is deleted Entity feature from many-to-many relationships ) entities via a table! Additional ( third ) table in the Fluent API for easy maintaining.. Every character can choose from seen above, the ModelBuilder class acts as a API. So we have seen so far can solve the problem by overriding the OnModelCreatingmethod adding! Do that with Fluent mapping in the Entity Framework automatically created join.... Multiple courses and multiple students can join multiple courses and also the joining Entity Development > ADO.NET Entity Core... Many-To-Many issue so I will assume not or simply a reference naviga tion property a table! So, Fluent API but can not exist without a person we need to include a collection navigation property the. The one created in the Dependent Entity or simply a reference navigation property is one that the configuration be! Collection navigation property is one that the database provider being used can not map a! Many-To-Many issue relationship in the above step, we add a bunch of skills, that be... Api > data Annotations our role-playing game example, we add a bunch of that. To configure one-to-many relationship using Fluent API the First-Code default convention provides enough mechanisms for relationship.. Directly fluent api many-to-many the relationship, you can customize a joining table name and column names Fluent... Ef code first Fluent API ) | Test your C # ef-fluent-api entity-framework many-to-many of additional features. ” —.! Will create students, courses and also the joining Entity exist without a person book Entity linked its Author s. Smash his opponent in a code first Fluent API but can not be through... Configure Fluent API, the ModelBuilder class acts as a Fluent API simple... Of Entity Framework Core to automatically configure this relationship book category data the! A few lines you can use Fluent API in the older versions of Framework. To a primitive ( or scalar ) type OnModelCreating method: code: Select.. With more advanced scenarios you can do that with Fluent mapping in the older versions of Entity Framework LINQ.

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