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_posts/2017-06-23-today-i-learned-1.md

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+---
+ID: 147
+post_title: 'Today I Learned #1'
+author: dreat
+post_excerpt: ""
+layout: post
+permalink: >
+  http://dreat.info/2017/06/23/today-i-learned-1/
+published: true
+post_date: 2017-06-23 21:22:01
+---
+While using EntityFramework in my integration tests (which is a separate topic ;) ) I discovered quite interesting thing. I guess this may be obvious to some, but I learned Entity "the hard way" jumping into an app with Entity already in place and had to adapt - this was my first app with a database by the way.
+
+So if you add entities to your context I'm used to adding all entities to context, so the code would look like
+[csharp]
+using (var ctx = new Context())
+{
+    var first = new FirstEntity { .. };
+    var second = new SecondEntity { .. };
+
+    ctx.FirstEntities.Add(first);
+    ctx.SecondEntities.Add(second);
+    ctx.SaveChanges();
+}
+[/csharp]
+
+But if entities are related, you can safely do this
+[csharp]
+using (var ctx = new Context())
+{
+    var first = new FirstEntity { .. };
+    var second = new SecondEntity { Relation = first };
+
+    //this will also take care of the first one!
+    ctx.SecondEntities.Add(second); 
+    ctx.SaveChanges();
+}
+[/csharp]
+Or even this!
+[csharp]
+using (var ctx = new Context())
+{
+    var second = new SecondEntity { Relation = new FirstEntity{ .. } };
+
+    ctx.SecondEntities.Add(second);
+    ctx.SaveChanges();
+}
+[/csharp]
+
+It's nice and saves some typing! :)