# The new DataMapper attribute in Glass Mapper


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Late last year I got my [pull request](https://github.com/mikeedwards83/Glass.Mapper/pull/265) to [Glass Mapper](http://www.glass.lu/) merged, adding a `[DataMapper(Type)]` attribute for use in **attribute configuration** of models.
 
Before this it wasn't possible to **explicitly state** which **data mapper** should be used for mapping a property. You had to do add the data mapper in the `GlassMapperScCustom.CreateResolver()` method.
 
I ended up creating this attribute as I was working on an internal library/module that was using **Glass Mapper**, which was meant to be used by other projects and as such didn't have access to the Glass Mapper configuration. All of the model mapping had to be done using attribute configuration (at least that way it wouldn't require any setup in consuming projects).
 
The `[DataMapper(Type)]` is part of Glass Mapper since **v4.3.1.194**
 
You use it like this:

```csharp
[DataMapper(typeof (MyCustomDataMapper))]
[SitecoreField("MyField")]
public MyCustomType MyField { get; set;}
```
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