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The aura framework and lightning:recordData currently (Summer 18) support only single object retrieval.

Let's assume I got a listItem.cmp into which I wired force:recordData in VIEW mode or a lightning:recordViewForm

Is the following code, then, a good idea or a bad idea and why? 

<aura:iteration items="{!v.listOfRecordIds}" var="recordId">
    <c:listItem recordId="{recordId}"/>
</aura:iteration>

Does the answer change if I use forms of the Lightning Data Service that also support record updates?

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5

You'll want to look at this answer regarding force:recordData performance, which lightning:recordViewForm depends on. Basically, doing this is going to generate a ton of traffic and perform very poorly if you're dealing with more than about six records. So, if you expect to have only a handful of records, knock yourself out and use the lightning:record* elements.

However, if you expect to have a significant number of elements, you're better off writing some Apex Code to get the results back. You'll have to evaluate if the performance trade off is worth it.

Also, I might add, that a FULL layout, if you choose to use it, results in about 500k of data being transferred per record, which means that even if it looks okay on a desktop/laptop, mobile devices are going to chew through metered data like an unattended child does candy while Trick-or-Treating.

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  • 1
    The FULL options transports Userinterface API data (Layouts, Field Info, RecType Info) - just to avoid the impression that 'full' is just bloated. I do hope we can soon access this information programmatically. I agree with your assessment that especially for iterations this is too much unnecessary data. – Christian Szandor Knapp Jul 12 '18 at 17:30
  • @ChristianSzandorKnapp Yep, it's the ui-api. Everything you need to render a record correctly. – sfdcfox Jul 12 '18 at 18:07

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