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| 1 | +--- |
| 2 | +title: Use Nested Model Properties |
| 3 | +page_title: Use Nested Model Properties | {{ site.framework }} |
| 4 | +description: An example on how to use nested model properties in the {{ site.framework }} |
| 5 | +slug: howto_use_nested_model_properties_grid |
| 6 | +tags: use, nested, model, properties, grid |
| 7 | +component: grid |
| 8 | +type: how-to |
| 9 | +res_type: kb |
| 10 | +--- |
| 11 | + |
| 12 | +## Environment |
| 13 | + |
| 14 | +<table> |
| 15 | + <tr> |
| 16 | + <td>Product</td> |
| 17 | + <td>{{ site.framework }} Grid</td> |
| 18 | + </tr> |
| 19 | + <tr> |
| 20 | + <td>Operating System</td> |
| 21 | + <td>All</td> |
| 22 | + </tr> |
| 23 | + <tr> |
| 24 | + <td>Browser</td> |
| 25 | + <td>All</td> |
| 26 | + </tr> |
| 27 | + <tr> |
| 28 | + <td>Browser Version</td> |
| 29 | + <td>All</td> |
| 30 | + </tr> |
| 31 | +</table> |
| 32 | + |
| 33 | +## Description |
| 34 | + |
| 35 | +How can I use nested Model properties in the {{ site.framework }}'s Grid? |
| 36 | + |
| 37 | +## Solution |
| 38 | + |
| 39 | +To bind a column of the Grid to a Model with nested properties you need to use a Custom DataSource which allows you to configure the `[From](https://docs.telerik.com/{{ site.platform }}/api/Kendo.Mvc.UI.Fluent/CustomDataSourceModelFieldDescriptorBuilder#fromsystemstring)` configuration property of the `[Schema.Model.Field](https://docs.telerik.com/{{ site.platform }}/api/Kendo.Mvc.UI.Fluent/CustomDataSourceModelDescriptorFactory#fieldsystemstring)`. |
| 40 | + |
| 41 | +In addition when you use `From` together with CRUD operations and add new rows, you also have to define in `Schema.Model.Field` the original field or the sequence of nested fields which are used inside `From`. |
| 42 | + |
| 43 | +The reason is that during updates and creates, the Telerik UI DataSource tries to construct a data item object which matches the original (server-side) data-item structure. For new data items, such a structure does not exist and needs to be defined explicitly. |
| 44 | + |
| 45 | +``` |
| 46 | + ... |
| 47 | + .DataSource(ds => ds |
| 48 | + .Custom() |
| 49 | + .PageSize(20) |
| 50 | + .ServerFiltering(false) |
| 51 | + .Schema(schema => |
| 52 | + schema.Model(model => |
| 53 | + { |
| 54 | + model.Id(id => id.Name); |
| 55 | + model.Field(f => f.Name); |
| 56 | + model.Field(f => f.Description).From("Description.Text"); |
| 57 | + }).Data("Data").Total("Total") |
| 58 | + ) |
| 59 | + .Transport(transport => |
| 60 | + { |
| 61 | + transport.Read("Orders_Read", "Grid"); |
| 62 | + transport.Update("Orders_Update", "Grid"); |
| 63 | + transport.Create("Orders_Create", "Grid"); |
| 64 | + transport.Destroy("Orders_Destroy", "Grid"); |
| 65 | + }) |
| 66 | + ) |
| 67 | + ) |
| 68 | +``` |
| 69 | + |
| 70 | +## See Also |
| 71 | + |
| 72 | +* [JavaScript API Reference of the Grid](https://docs.telerik.com/kendo-ui/api/javascript/ui/grid) |
| 73 | +* [JavaScript API Reference of the DataSource](https://docs.telerik.com/kendo-ui/api/javascript/data/datasource) |
| 74 | +* [Server-side API Reference of the DataSource](https://docs.telerik.com/{{ site.platform }}/api/datasource) |
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