OData binding with Associations

[#1]

Hi,

I've created a GW service structured with one main element and a few associations. These work fine in the browser:

• /AssetCollection('1234')/ returns a single element
• /AssetCollection('1234')/Stock returns a single associated element (with a 1...1 relationship defined in SEGW)
• AssetCollection('1234')/AssetSummaryAlertSet returns an associated entity set (1...N)

I'm now trying to use these in my UI5 application. I set the application context to be (for example) /AssetCollection('1234') and can display elements of this entity using syntax like:

<Text text="{Id}"/>

I can also bind the associated entity collection to a List successfully using syntax:

<List headerText="Alerts" items="{AssetSummaryAlertSet}">
  <items>
    <ObjectListItem number="{Aoid}" title="{Title}">
      <attributes>
  <ObjectAttribute text="{Name}"/>
  <ObjectAttribute text="{Address}"/>
  </attributes>
    </ObjectListItem>
  </items>
</List>

My issue is displaying elements of associated entities where the relationship is 1..1:

I naively thought I could do something like:

<Text text="{StockCond/Quantity}"/>

This doesn't display anything and the corresponding endpoint is not called at all.

Looking at the binding in the Control Tree in the diagnostic popup tells me the path is: Stock/Quantity (invalid)

I get the same invalid error for my list however and that does display data!

Is this type of binding possible in UI5 or do I need to flatten my service and use something like $expand?

Thanks,

Gregor

[qmacro · Accepted solution]

Just an inkling, but as an alternative to $expand, you might try an explicit binding specification on the Text control

<Text binding="Stock" text="Quantity" />

ISTR this should fire an OData call to fetch the associated entity, but I could be dreaming...

[former_member182048 · Accepted solution]

Hi DJ

I think the following should work, the binding has to be relative to existing context

<Text binding="{/Stock}" text="{Quantity}" />

Couldnt get it working though see JS Bin

<commons:TextField  binding="{/Supplier}" value="{CompanyName}" />

should return

http://services.odata.org/V3/Northwind/Northwind.svc/Products(1)/Supplier/CompanyName

jsp

[Former Member · Accepted solution]

Thanks John and DJ, I have been struggling with this one for hours!

I've ended up with

<Text binding="{StockCond}" text="{Quantity}" /> (dropping the leading / to make it relative rather than absolute path I think?)

I really appreciate the help. Your contributions to the UI5 community and beginners like myself are astonishing!

[qmacro · Accepted solution]

Great, I was typing that XML in my reply while trying to do something else, and rushed it. Of course, the property bindings needed to go in {...} too, and I misread StockCond as Stock.

Note to self: do one thing at a time! 🙂

[former_member182048 · Accepted solution]

cool, thanks

[former_member182048]

Hi Gregor

Your on the right track, see JSBin HTML example, to expand try

{path:'/AssetCollection', parameters:{expand:'Stock'}}

hth

jsp