OK here is what i am trying to do.
I have a grid component, and I wanted to display on the grid, a list
of ship objects. Think of this like a cruise liner.
I am retrieving these objects from a java/hybernate/spring adapter
using remote object, and it works ok. I get back an arrayCollection,
then I build a new array, populatate it with Actionscript ship
objects, which has an embedded port object.
Ship has attributes like Name, id, comments etc. And it has an
embedded homeport object also.
The port, has name, country and comments too.
I can get the object to come back, and its being built correctly. I
have ship objects and each one has its own port object, I see in the
debugger the objects and thier embedded objects and the embedded
object values. So I know the constructor is working fine. Here is the
problem.
I set the dataprovider attribute to match the array of completed
ships, and I can get the grid, to display all the ship data, but not
the port data.
So Here is my code:
<mx:DataGrid id="ShipListDataGrid" width="978" height="190"
dataProvider="{initDG}" creationComplete="loadAllShips()"
selectedIndex="0" >
<mx:columns>
<mx:DataGridColumn headerText="Name" dataField="name"/>
<mx:DataGridColumn headerText="Class" dataField="clazz"/>
<mx:DataGridColumn headerText="Comments" dataField="comments"/>
<mx:DataGridColumn headerText="Port Country" dataField="port.country" />
</mx:columns>
</mx:DataGrid>
Now the colums name, clazz, comments all work perfectly, as they are
attributes of ship. However, port.country does not work, it just shows
a blank column, even though that is the correct notation to get to
that data field, for the attribute of that ships port home country.
Its just a string, so for the port called miami, the country is "USA".
This does not display.
However if I remove port.country, and only put in port, then it shows
that whats in that column displays as Object : Port.
So it seems that the grid knows theres an object in there. But not
what to do with it?
I have created a masterViewList and a masterDetails component, and the
viewList is the grid, and the details is the details section of the
ship. So there it shows a form, and the form shows all the details of
the ship selected in the list above. Heres the interesting thing.
using a label field, I can change the selected list item on the grid,
and show the ship.port.country in a label on the bottom, so it can
transverse the ship object, but just not seemingly in the grid.
What can I do? Why does it work with a label field, and not in the
grid? Why will the grid not show an embedded string attribute for an
embedded object, but a label or text box will? What am I doing wrong?
At the prompting of someone from the Flex Developer forums on adobes
site, I implemented this also.
On the column I put this as the datafield: (instead of the above
port.country, or port)
<mx:DataGridColumn headerText="Port Country"
dataField="{calcPortCountry}" />
And created this function:
private function calcPortCountry(item:Object, col:DataGridColumn):String
{
return item.port.country;
}
But this also gets me the same result. Nothing inside the grid column.
All the tutorials seem to be for passing simple objects which only
contain simple attributes, strings ints, and stuff like that. Nothing
with embedded objects. This is a ship object, which has an embedded
port object inside it. I have tried debugging this new function, and I
cannot even get into the function above to see whats being passed.
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