Docu on how to ensure foreign() works

tobsn · tobsn · commit b92f5bc85426 · 2012-08-21T00:09:01.000+02:00
tons of people are doing it wrong every day - this should fix it or at
least can be used as reference.
diff --git a/laravel/documentation/database/schema.md b/laravel/documentation/database/schema.md
@@ -144,4 +144,10 @@ You may also specify options for the "on delete" and "on update" actions of the
 
 You may also easily drop a foreign key constraint. The default foreign key names follow the [same convention](#dropping-indexes) as the other indexes created by the Schema builder. Here's an example:
 
-	$table->drop_foreign('posts_user_id_foreign');
+	$table->drop_foreign('posts_user_id_foreign');
+
+> **Note:** The field referenced in the foreign key is very likely an auto increment and therefore automatically an unsigned integer. Please make sure to create the foreign key field with **unsigned()** as both fields have to be the exact same type, the engine on both tables has to be set to **InnoDB**, and the referenced table must be created **before** the table with the foreign key.
+
+	$table->engine = 'InnoDB';
+
+	$table->integer('user_id')->unsigned();
