added note about Model.delete_all vs Model.all.destroy!

pointcom · Sep 6, 2008 · 65bda3c · 65bda3c
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diff --git a/book/source/Chapters/4_A_Little_Blog/1_MVC/1_Models.markdown b/book/source/Chapters/4_A_Little_Blog/1_MVC/1_Models.markdown
@@ -670,6 +670,8 @@ earlier, is a kicker method. It issues a `SELECT` appropriate to the conditions.
 This command would update the `allow_beer` attribute of all people aged 21 or
 older in the database, all in one `UPDATE` statement.
 
+Note: ActiveRecord has a well known `Model.delete_all` class method to erase all table entries. In DataMapper to delete all instances of an Object in the database, you would do `Model.all.destroy!`
+
 #### Aggregates
 
 DataMapper by default does not provide aggregator methods, but dm-aggregates