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Max PaqMax Paq 

Use an array to set a field value of an sObject Collection

In a lightning component, I am trying to use the values in 1 array to set the values for a field in a second array. But for whatever reason I always end up with the last value of my array as the field value.

Here is the component: 
<aura:attribute name="spaceTypeList" type="string[]" default="Conference/Focus Room,Copy Area,Kitchenette,Loading Dock,Electrical Room,Exterior Building,Janitorial Closet,Mothers Room,Office Area,Parking Garage,Restrooms/Locker Rooms,Stairs/Elevators,Carpet Spots/Vacuuming/Flooring,Lobbies/Corridors"/>
    <aura:attribute name="detailRecord" type="Inspection_Area_Detail__c" 
                        default="{'Inspection_Area__c':'',
                                 'Space_Subset__c':'',
                                 'Rating__c':'0',
                                 }"/>
    <aura:attribute name="detailList" type="Inspection_Area_Detail__c[]"/>
    
    <ui:button label="loop test" press="{!c.loop}"/>
    
    <aura:iteration items="{!v.detailList}" var="det">
        <p> Space {!det.Space_Subset__c}</p>
    </aura:iteration>



And here is the controller:

     
({
        loop: function(component, event, helper) {
            
            var spaceList = component.get("v.spaceTypeList");
            var detail = component.get("v.detailRecord");
            var List =component.get("v.detailList");
            
            for(i in spaceList){
                var space =spaceList[i];
                detail.Space_Subset__c = space;
                console.log("detail space subset "+detail.Space_Subset__c);
                List.push(detail);
                
            }
            component.set("v.detailList",List);
            
        },
    })





Thank you for your help.
Best Answer chosen by Max Paq
Mohith Kumar ShrivastavaMohith Kumar Shrivastava
Analysed the root cause of this issue .Since lightning is two way binded with UI ,the new values are always equal to the present instance of attribute.
Lets try and understand with more console log statements
With your original code
  
<aura:component >
<aura:attribute name="spaceTypeList" type="string[]" default="Conference/Focus Room,Copy Area,Kitchenette,Loading Dock,Electrical Room,Exterior Building,Janitorial Closet,Mothers Room,Office Area,Parking Garage,Restrooms/Locker Rooms,Stairs/Elevators,Carpet Spots/Vacuuming/Flooring,Lobbies/Corridors"/>
<aura:attribute name="detailRecord" type="Account" 
             default="{ 'sobjectType': 'Account','Name': ''}"/>
<aura:attribute name="acclst" type="Account[]"/>

<ui:button label="loop test" press="{!c.loop}"/>

<aura:iteration items="{!v.acclst}" var="acc">
   <p> Space {!acc.Name}</p>
 </aura:iteration>
</aura:component>

JS client side
  
({
loop : function(component, event, helper) {
    var spaceList = component.get("v.spaceTypeList");
    var detail = component.get("v.detailRecord");
    var newlst =[];
    for(i in spaceList){
        console.log(i);
        var space = spaceList[i];
        var detailtemp = {};
        detailtemp = detail;
        detailtemp.Name = space;
        console.log("detail space subset "+detailtemp.Name);
        newlst.push(detailtemp);
        console.log("value after iteration"+i+JSON.stringify(newlst));
    }
    component.set("v.acclst",newlst);
},
})

The results are as below

User-added image

User-added image


The primary culprit is this line below
detailtemp = detail;
In short it picks latest value of attribute everytime.
Now we understand this more ,lets not use the value from the attribute instead decouple the variable
  
({
   loop : function(component, event, helper) {
    var spaceList = component.get("v.spaceTypeList");
    //var detail = component.get("v.detailRecord");lets not use this guy..He is doing mischief
    var newlst =[];
    for(i in spaceList){
        console.log(i);
        var space = spaceList[i];
        var detailtemp = {};
        detailtemp = { 'sobjectType': 'Account','Name': ''};
        detailtemp.Name = space;
        console.log("detail space subset "+detailtemp.Name);
        newlst.push(detailtemp);
        console.log("value after iteration"+i+JSON.stringify(newlst));
    }
    component.set("v.acclst",newlst);
   },
 })

User-added image

All Answers

Adrian GawryszewskiAdrian Gawryszewski
I assume that i stands for a position on a list? If so you're using the wrong loop. Use traditional for loop instead of foreach loop. Using foreach would only work if spaceList was a map and you would like to iterate over the key set.

Regards
Adrian
Mohith Kumar ShrivastavaMohith Kumar Shrivastava
Analysed the root cause of this issue .Since lightning is two way binded with UI ,the new values are always equal to the present instance of attribute.
Lets try and understand with more console log statements
With your original code
  
<aura:component >
<aura:attribute name="spaceTypeList" type="string[]" default="Conference/Focus Room,Copy Area,Kitchenette,Loading Dock,Electrical Room,Exterior Building,Janitorial Closet,Mothers Room,Office Area,Parking Garage,Restrooms/Locker Rooms,Stairs/Elevators,Carpet Spots/Vacuuming/Flooring,Lobbies/Corridors"/>
<aura:attribute name="detailRecord" type="Account" 
             default="{ 'sobjectType': 'Account','Name': ''}"/>
<aura:attribute name="acclst" type="Account[]"/>

<ui:button label="loop test" press="{!c.loop}"/>

<aura:iteration items="{!v.acclst}" var="acc">
   <p> Space {!acc.Name}</p>
 </aura:iteration>
</aura:component>

JS client side
  
({
loop : function(component, event, helper) {
    var spaceList = component.get("v.spaceTypeList");
    var detail = component.get("v.detailRecord");
    var newlst =[];
    for(i in spaceList){
        console.log(i);
        var space = spaceList[i];
        var detailtemp = {};
        detailtemp = detail;
        detailtemp.Name = space;
        console.log("detail space subset "+detailtemp.Name);
        newlst.push(detailtemp);
        console.log("value after iteration"+i+JSON.stringify(newlst));
    }
    component.set("v.acclst",newlst);
},
})

The results are as below

User-added image

User-added image


The primary culprit is this line below
detailtemp = detail;
In short it picks latest value of attribute everytime.
Now we understand this more ,lets not use the value from the attribute instead decouple the variable
  
({
   loop : function(component, event, helper) {
    var spaceList = component.get("v.spaceTypeList");
    //var detail = component.get("v.detailRecord");lets not use this guy..He is doing mischief
    var newlst =[];
    for(i in spaceList){
        console.log(i);
        var space = spaceList[i];
        var detailtemp = {};
        detailtemp = { 'sobjectType': 'Account','Name': ''};
        detailtemp.Name = space;
        console.log("detail space subset "+detailtemp.Name);
        newlst.push(detailtemp);
        console.log("value after iteration"+i+JSON.stringify(newlst));
    }
    component.set("v.acclst",newlst);
   },
 })

User-added image
This was selected as the best answer
lp_salesforcelp_salesforce
Good answer. Its worked for me.