Revert "move blog to /blog"

This reverts commit 4d5a3768cc.

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

@@ -0,0 +1,53 @@
+---
+post_title: 'Today I Learned #1'
+author: dreat
+layout: post
+published: true
+post_date: 2017-06-23 21:22:01
+tags: [archived, til, csharp]
+categories: [til, theory, old_blog]
+---
+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();
+}
+```
+
+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();
+}
+```
+
+
+Or even this!
+
+```csharp
+using (var ctx = new Context())
+{
+    var second = new SecondEntity { Relation = new FirstEntity{ .. } };
+
+    ctx.SecondEntities.Add(second);
+    ctx.SaveChanges();
+}
+```
+
+It's nice and saves some typing! :)