aura: iteration issues

Question

I have this lightning component that successfully gets knowledge articles from KnowledgeArticleVersion and I have verified the correct data coming through dev console logs... However, I am having some trouble using aura atrributes. I am unable to get the component to actually render the data. I am guessing my issue has something to do with trying to return list data to SObject[] type, thus not allowing {!article.Id} etc to render any data in the component.

Any ideas?

.cmp

<aura:component implements="forceCommunity:availableForAllPageTypes" controller="GetHBArticles">
    <aura:attribute name="articles" type="SObject[]"/>

    <ui:button label="Get Articles" press="{!c.getArts}"/>
    <aura:iteration var="articles" items="{!v.articles}">
        <p>{!articles.Id} : {!articles.Title} : {!articles.ArticleType}</p>
    </aura:iteration>

</aura:component>

lightning controller

({
    getArts: function(cmp){
        var action = cmp.get("c.getArticlesList");
        action.setCallback(this, function(response){
            var state = response.getState();
            if (state === "SUCCESS") {
                cmp.set("v.articles", response.getReturnValue());
            }
        });
     $A.enqueueAction(action);
    }
})

apex controller

public with sharing class GetHBArticles {

    @AuraEnabled
    public static List<List<SObject>> getArticlesList(){
        List<List<SObject>> articles = [FIND :searchVar RETURNING KnowledgeArticleVersion
                                                     (Id, Title, ArticleType WHERE PublishStatus='online' AND Language = 'en_US' AND ArticleType IN ('Troubleshooting__kav', 'How_To__kav', 'FAQ__kav'))
                                                     WITH DATA CATEGORY Topics__c AT 'DataCategoryName];
        return articles;
    }



}

As always any help from this awesome group is greatly appreciated.

Answer 1

@AllenMann you could fix this in two ways:

1.Return List<KnowledgeArticleVersion> instead of List<List<SObject>> to do so you have to change getArticlesList method as below:

 @AuraEnabled
 public static List<KnowledgeArticleVersion> getArticlesList(){
    List<KnowledgeArticleVersion> articles = [FIND :searchVar RETURNING KnowledgeArticleVersion
                                                 (Id, Title, ArticleType WHERE PublishStatus='online' AND Language = 'en_US' AND ArticleType IN ('Troubleshooting__kav', 'How_To__kav', 'FAQ__kav'))
                                                 WITH DATA CATEGORY Topics__c AT 'DataCategoryName'][0];
    return articles;
 }

2.Use the first element(i.e index = 0) of the response which is an array containing an array of KnowledgeArticleVersion data in lightning controller

  var result = response.getReturnValue();
  if(result.length && result[0].length)
     cmp.set("v.articles",result[0]);