Ef core enum foreign key. Mar 30, 2023 · Shadow foreign key properties.


  1. Home
    1. Ef core enum foreign key Old Answer. The design can be created using the designer or by using scripts. Mar 1, 2022 · I'm using the Entity Framework Core 6 fluent API to configure my database schema in a . Because EF was creating 2 foreign keys in the database table: CountryId, and CountryId1, but the code above fixed that. note that i omitted some useful code to stick to the point, refer to the full example for further explanation. Sep 25, 2019 · In this ef core 2. Example: We create some infrastructure that help us in the creation of the catalogue table. May 28, 2013 · How about try something simple with Property mapping rather than Fluent API mapping;. And changing primary key values is a hassle. 0. NET CORE / EF Core I made a few adjustments to Alberto's solution. For brevity, only the modifications are shown below: Create a extension method to get description from enum and seed values May 16, 2018 · How would one turn the enums used in an EF Core database context into lookup tables and add the relevant foreign keys? Same as EF5 Code First Enums and Lookup Tables but for EF Core instead of EF 6 Sep 16, 2018 · Now I simply want to create a foreign key constraint between TestData. Mar 30, 2023 · Shadow foreign key properties. This has the advantage of reusing the SubscriptionLevel enum property in the Customer entity class for the Foreign Key to the SubscriptionLevel class. Mar 30, 2023 · EF Core relationship mapping is all about mapping the primary key/foreign key representation used in a relational database to the references between objects used in an object model. Int32'. NET framework. For more context, these are my types: Mar 22, 2020 · I am using EF core and CodeFirst approach to handle my database and very new to them. 4. Share. That is, if a foreign key value changes such that it now refers to a different principal/parent entity, then the navigations are updated to reflect this change. I'm a bit concerned because I thought it initially worked. How can i fill object collection (Student. Dec 4, 2018 · I am new to EF Core, and am trying to seed an enum. This problem is seems to be the result of using enumerations as values for an entity and wanting to have a reference table in the database that reflects these values with a foreign Feb 5, 2016 · Awesome this fixes the issue. I also got the error: The ResultType is MyEnum of the specified expression is not compatible with the required type 'Edm. Identity)] public int ClaimId { get; set; } public string Name { get; set; } public virtual ICollection<ClaimDetail> ClaimDetails { get; set; } } public class ClaimDetail { [Key] [DatabaseGenerated(DatabaseGeneratedOption. From a database point of view, this should be an Id field referencing a Category table via foreign key. Parameters) with records from Parameters table? I will try to explain on simple example of school. 0. Sep 2, 2021 · Entity Framework Core 2 - Foreign Key Constraint. 1. But that alone would generate SQL that throws an exception because the database type is different. Jan 1, 2016 · Excellent @AlbertoMonterio! To get this to work with ASP. Parameters, Teacher. Jan 20, 2022 · This satisfies EF's requirement that primary key and foreign key properties should have the same type. Problem: I would like to generate from these lookup tables Enums which I can use in my code. 5 of the . The Database-First approach is an alternative to the Code-First approach. 2 Jul 5, 2023 · , on the other hand, performs case-sensitive string comparisons by default. To use enum in Entity Framework, the project must have a minimum version 4. NET Core project. The post you mentioned clearly describes a FK cannot be used so you need to refactor that to something that can be applied. Jul 7, 2022 · So far so good. A value comparer for keys can be used to force EF Core into case-insensitive string comparisons like in the database. Improve this answer. 1-to-many relation between CollectionModel and ItemModel (over-simplified example): Aug 26, 2020 · After trying to make it work with the existing database => and fail, the only solution is add key to both tables (principal and referencing tables) for EF Core to function properly. 1:M Dec 19, 2023 · Probably I should ask a simpler question - how to write modelling classes (and possible DbContext overrides) to have migration generate an equivalent of this: CREATE TABLE ParentTable ( ParentID INT PRIMARY KEY, UniColumn INT UNIQUE ); CREATE TABLE ChildTable ( ChildID INT PRIMARY KEY, FOREIGN KEY (ChildID) REFERENCES ParentTable(UniColumn) ); Sep 11, 2022 · I'm using DDD patterns while using ef core and I've a problem to configure an entity to generate a foreign key in this particular scenario. Suppose a class like this public class GasStation : Entity, IAggregateRoot, IPlace { public ImportFeed ImportFeed { get; private set; } Entity getter and setter must use enum type, not int, so any interaction with entity is done using enums. This means that a foreign key value like "DotNet" will match the primary key value "dotnet" on SQL Server, but will not match it in EF Core. EF does not allow for foreign key constraints on no key tables. Identity)] public Feb 1, 2016 · public virtual List<Detail> Details { get; set;} } public class Detail { //Let's use DetailId as the key here because that is the convention //we've used in the "Item" class public int DetailId { get; set; } /*Any property with the same data type as the principal primary key property and with a name that follows one of the following formats I have built a lookup table based on enums, pretty much based on that suggestion: How to create a table corresponding to enum in EF6 Code First? Now my problem is that I am unable to configure the foreign key for MyEntity. 2 example, we have a Company that owns a collection of Addresses, here's the implementation. Jan 8, 2021 · Enum are supported in EF 5. public class Claim { [Key] [DatabaseGenerated(DatabaseGeneratedOption. Also note that this feature OwnsMany() is not available in pre ef core 2. If EF has determined the dependent end of the relationship but no foreign key property was discovered, then EF will create a shadow property to represent the foreign key. My use case is that I want an enum with a 1:* relationship with another entity in the DB. When declaring two-way relationships we can easily specify the foreign key like this: modelB As a foreign key on a parameters table i'm using an enum (Student, Teacher) paired by column with primary key from multiple tables. Parameter name: keyValues[0] See full list on learn. Oct 21, 2020 · It seems that Entity Framework Core doesn't respect the custom name of the foreign key I specified as property attribute. As per the default convention, EF makes a property as foreign key property when its name matches with the primary key property of a related entity. The shadow property: Has the type of the primary or alternate key property at the principal end of the relationship. OrderType to the OrderType table. Solution is based in: A base class, that helps us in Oct 5, 2021 · How can I get Entity Framework Core to use OrderId as the Foreign Key for both relationships? Update: I want to be able to query Orders and get the list of corresponding OrderDetails (that have that order's OrderId in the OrderDetail table). I get what you are saying about enums as keys and I totally agree. The ForeignKey attribute is used to configure a foreign key in the relationship between two entities in EF 6 and EF Core. So the obvious thing here would be to create a real nullable foreign key to a new primary key field, KnownProductCodesId. EF Core Code First DB Context: Mar 23, 2013 · Most easily the solution lies in introducing an enum that is used as discriminator to represent the type. It overrides the default conventions. Jan 22, 2015 · A second point is that meaningful primary keys, like KnownProductCodes. How to define foreign key relationship in EF Core 2. Support of Enum in Database First. Type (the enumeration) and the TestTypeID of the test type entry table using the fluent API. . microsoft. Adding a foreign key property to one entity type. com Nov 21, 2018 · Entity Framework Core: Enums. In my database schema I have a few Lookup tables that serve the purpose as Enums for my other tables and those other tables has Foreign key on them. The enum table is updated at app-start off the actual enum in code and any non-existent enums are deleted. EF Core keeps navigations in alignment with foreign key values and vice versa. ProductCode, are nearly always a bad idea, because one day the business may demand to change their values. I also want to be able to do the same with the RoutedOrder table. Entity framework core relationships - foreign key. In addition values are automatically populated. In the most basic sense, this involves: Adding a primary key property to each entity type. Mar 26, 2015 · Edit - As per @krillgars answer, in modern EF it's better to just use the actual enum type as the Primary Key (and referenced Foreign Keys) - EF6 and EfCore can map this out fine. These enums should be populated by the data in the lookup table (Id, Value). I created 3 model classes (IncomeTypes, AdIncomes and Students) and their relationships are as follows. gbgpd mdtwy ptehmm mrogplon wxzzci fcx xrav nzom kbzop bnmx