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[CLOSED] GridPanel - ModelField - Mapping

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  1. #1
    Jul 07, 2014, 2:03 PM

    [CLOSED] GridPanel - ModelField - Mapping

    Hi everyone! I hope you can help me with this.

    I have a Store that reads from the database using LINQ. Store.DataSource = List(Of Clients).

    The thing is that Clients is associated with Cities. How can I do to show in the GridPanel the name of the city associated? Such as (this doesn't work):

    <ext:ModelField Name="CityName" Type="String" Mapping="Cities.CityName" />
    Properties of Clients:

    - Id
    - Name
    - City: Object of Cities

    I hope I explained myself.

    Thanks in advance.
    Last edited by Daniil; Jul 08, 2014 at 1:04 PM. Reason: [CLOSED]
  2. #2
    Jul 07, 2014, 2:12 PM
    Let me know whether https://examples2.ext.net/#/GridPane..._Data_Binding/ example helps you.

    if it does not fit your needs, please post a complete (but simplified) code sample demonstrating how to reproduce the issue.
  3. #3
    Jul 07, 2014, 2:17 PM
    Hi @jamesand,

    So, a Client has many Cities.

    This 
    <ext:ModelField Name="CityName" Type="String" Mapping="Cities.CityName" />
    looks that the Client has the only City, but that is not true.

    I guess you might be looking for a HasManyAssociation.
    https://examples2.ext.net/#/search/HasMany
  4. #4
    Jul 07, 2014, 2:34 PM
    Daniil, i agree with you that he might be looking for a HasManyAssociation, but it sounds weird show the name of the city when it's a list of cities.
  5. #5
    Jul 07, 2014, 2:51 PM
    Thank you Raphael and Daniil for your quick responses.

    In fact one client has just one city, as Raphael said.

    When I write:

    <ext:ModelField Name="Cities">
                            <Model>
                                <ext:Model runat="server">
                                    <Fields>
                                        <ext:ModelField Name="CityName"/>
                                    </Fields>
                                </ext:Model>
                            </Model>
                        </ext:ModelField>
    it crashes saying: 'Ext.Net.ModelField' doesn't have any property which name is 'Model'.
  6. #6
    Jul 07, 2014, 4:28 PM
    Attachment 13351

    <!DOCTYPE html>
<html>
<head id="Head1" runat="server">
</head>
<body>
    <ext:ResourceManager runat="server" SeparateUIStyles="false" ScriptMode="Development" />
    <ext:GridPanel runat="server" Title="Records" Frame="false" Width="500" Height="500 ">
        <Store>
            <ext:Store AutoLoad="true" ID="_str" runat="server">
                <Proxy>
                    <ext:AjaxProxy Url="/Example/LoadFakeRecords/">
                        <ActionMethods Read="POST" />
                        <Reader>
                            <ext:JsonReader Root="data" />
                        </Reader>
                    </ext:AjaxProxy>
                </Proxy>
                <Model>
                    <ext:Model runat="server">
                        <Fields>
                            <ext:ModelField Name="ID" Type="String" />
                            <ext:ModelField Name="Name" Type="String" />
                            <ext:ModelField Name="City" Type="String">
                                <Model>
                                    <ext:Model runat="server">
                                        <Fields>
                                            <ext:ModelField Name="Name" />
                                        </Fields>
                                    </ext:Model>
                                </Model>
                            </ext:ModelField>
                        </Fields>
                    </ext:Model>
                </Model>
            </ext:Store>
        </Store>
        <ColumnModel runat="server">
            <Columns>
                <ext:Column Text="ID" DataIndex="ID" runat="server" />
                <ext:Column Text="Name" DataIndex="Name" runat="server" />
                <ext:Column Text="City" DataIndex="City" runat="server">
                    <Renderer Handler="return value.Name;" />
                </ext:Column>
            </Columns>
        </ColumnModel>
    </ext:GridPanel>
</body>
</html>
    namespace RCNBS.Visions.SandBox.Controllers
{
    public class ExampleController : System.Web.Mvc.Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public StoreResult LoadFakeRecords()
        {
            List<Entity> lst = new List<Entity>();

            for (int index = 0; index < 15; index++)
            {
                lst.Add(new Entity
                {
                    ID = index,
                    Name = string.Format("Name{0}", index),
                    City = new City
                    {
                        Name = string.Format("City{0}", index)
                    }
                });
            }

            return new StoreResult(lst, lst.Count());
        }
    }

    public class Entity
    {
        public int ID { get; set; }

        public string Name { get; set; }

        public City City { get; set; }
    }

    public class City
    {
        public string Name { get; set; }
    }
}
    Last edited by RCN; Jul 07, 2014 at 5:09 PM.
  7. #7
    Jul 07, 2014, 4:50 PM
    it crashes saying: 'Ext.Net.ModelField' doesn't have any property which name is 'Model'.
    You might use the Ext.NET version which doesn't support that yet.

    As an alternative approach for the Raphael's suggestion, if you use a Store's DataSource, this should work:
    <ext:ModelField Name="CityName" Type="String" ServerMapping="Cities[0].CityName" />

  8. #8
    Jul 07, 2014, 5:19 PM
    Daniil, i do not know why it does not work properly if the set Type="String" on "City" ModelField, as shown below:

    Doesn't Work
    <ext:ModelField Name="City" Type="String">
    <Model>
        <ext:Model runat="server">
            <Fields>
                <ext:ModelField Name="Name" />
            </Fields>
        </ext:Model>
    </Model>
</ext:ModelField>
    Doesn't Work
    <ext:ModelField Name="City" Type="String">
    <Model>
        <ext:Model runat="server">
            <Fields>
                <ext:ModelField Name="Name" Type="String" />
            </Fields>
        </ext:Model>
    </Model>
</ext:ModelField>
    Works
    <ext:ModelField Name="City">
    <Model>
        <ext:Model runat="server">
            <Fields>
                <ext:ModelField Name="Name" Type="String" />
            </Fields>
        </ext:Model>
    </Model>
</ext:ModelField>
    Works
    <ext:ModelField Name="City">
    <Model>
        <ext:Model runat="server">
            <Fields>
                <ext:ModelField Name="Name" />
            </Fields>
        </ext:Model>
    </Model>
</ext:ModelField>
    I think that "City" ModelField type must be set to "Object", what is done implicitly when no value is set.
    Last edited by RCN; Jul 07, 2014 at 5:23 PM.
  9. #9
    Jul 08, 2014, 4:31 AM
    Yes, the Type should not be String, because it means a .toString() call on the value.
    arrayValue.toString();
    So, then a result string will be parsed by the inner Model. Something like this:
    arrayValue.toString().Name
    Type="Object", as well as omitted Type or Type="Value", mean that no conversion will be made with the value.
  10. #10
    Jul 08, 2014, 12:12 PM
    Ok, without Type="String" works. Thank you both!
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