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This is achieved using a customized OCL constraint solver. #SEED DATA CREATOR GENERATOR#Then you can chain this method in the Program. Our data generator then transforms the seed sample into a collection of valid instance models. #SEED DATA CREATOR CODE#You could also refactor the code that calls the seed method into an extension method on IWebHost: public static IWebHost SeedData(this IWebHost host) This example ilustrates how this might be achieved in an ASP.NET application: public void Main(string args) The SeedCountries method is called in the Main method of the Progam class. While this example uses hardcoded country names (and is curtailed for brevity), the code could just as simply read seed data from an external location such as a web service, text or XML file. var app builder. () () And after line containing.Here is how you can add an author together with related books: protected override void OnModelCreating(ModelBuilder modelBuilder) In my case, I'm using and needed initialize application with default values in database using seed methods. Related data must be added separately via the HasData method applied to the related entity's EntityTypeBuilder. When a migration is created, the SQL Server provider will enable the insertion of Identity values: SET IDENTITY_INSERT ON The key value is required so it must be supplied. The following example illustrates seeding by adding an entry to the Authors table: protected override void OnModelCreating(ModelBuilder modelBuilder) So, basically, seeding forms part of model configuration. OnModelCreatingĪs of version 2.1, Entity Framework Core has a formal API for applying seed data to the database as part of your migration - the HasData method of the EntityTypeBuilder method, which is exposed by the ModelBuilder.Entity method, accessible in the OnModelCreating method of the DbContext class. You use seeding to provide initial values for lookup lists, for demo purposes, proof of concepts etc. Seed data is data that you populate the database with at the time it is created.
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