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POWhere to put Seed data using EF5 code-first migrations
 

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  1. POWhere to put Seed data using EF5 code-first migrations
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    <p>I'm starting out with EF and MVC, and following different tutorials provide different confusing ideas on where is the correct place to put dummy test data in my database.</p> <p>So I've made some POCO classes, I have a BlahContext</p> <pre><code>public class BlahContext : DbContext { public DbSet&lt;Blah&gt; Blahs { get; set; } public BlahContext() : base("DefaultConnection") { Configuration.ProxyCreationEnabled = false; } } </code></pre> <p>Then in Global.asax.cs I initialize the database like this:</p> <pre><code>protected void Application_Start() { Database.SetInitializer(new DropCreateDatabaseAlways&lt;BlahContext&gt;()); } </code></pre> <p>Now I did the following in Package Manager Console:</p> <pre><code>PM&gt; enable-migrations -contexttypename Blah.Models.BlahContext PM&gt; add-migration Initial PM&gt; update-database </code></pre> <p>This created Configuration.cs, and in that class there is a Seed() method - the generated comments imply that this is the correct place to put seed data. So I filled it in like this:</p> <pre><code>internal sealed class Configuration : DbMigrationsConfiguration&lt;Blah.Models.BlahContext&gt; { public Configuration() { AutomaticMigrationsEnabled = false; } protected override void Seed(Blah.Models.BlahContext context) { #if DEBUG context.Blahs.AddOrUpdate(b =&gt; b.ID, new Blah() { ID = 1, Name = "bum", }, new Blah() { ID = 2, Name = "moo", } ); #endif } } </code></pre> <p>Now when I run <code>update-database</code> again, it populates the Blah table with the 2 records "bum" and "moo". All good.</p> <p>But when I run the application, it seems the <code>Database.SetInitializer()</code> call in <code>Application_Start</code> causes the database to be recreated, but this time the <code>Configuration.Seed()</code> method is <strong>not</strong> called. So the data is no longer present.</p> <p>I saw some other tutorials which created a class such as:</p> <pre><code>class BlahContextInitializer : DropCreateDatabaseAlways&lt;BlahContext&gt; </code></pre> <p>and then Application_Start looks like:</p> <pre><code>protected void Application_Start() { Database.SetInitializer(new BlahContextInitializer()); } </code></pre> <p>And then in the <code>BlahContextInitializer.Seed()</code> method that's where the dummy data is contained. Is this strategy for EF4.1 only?</p> <p>Where should I put my seed data in EF5 so that it doesn't get wiped out when the application starts?</p>
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