Hey guys, In this post we are going to learn about how to write inner query in Salesforce. And how to fetch data from multiple custom sObject using wrapper apex class in lightning component.
Also in this example we will achieving that how to
Files we used in this post example:-
| wrapperCustomObjCmp.cmp | Lightning Component | It is used for display the Input filed of name, address, email, and button Icon of delete on the table. |
| wrapperCustomObjCmpConroller.js | JavaScript Controller File | It is used for communicate to server side apex method and fetch the record using init fuction. |
| wrapperCustomObjCmpHelper.js | JavaScript Helper File | It is used for refresh the page after delete the record. |
| wrapperCustomObjCmp.CSS | Component Style CSS | It is used for creat a custom delete icon from resource. |
| wrapperCustomObjCtrCmp.apxc | Apex Class Controller | It is used for delete and fetching the records from multiple sObject from database server |
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Custom Parent Object:- NewStudent__c Custom Parent Object Fields:- Name, Email__c Address__c Custom Child Lookup Object:- Registration__c Custom Child Object Fields:- Name, RegNewStudent__r.Name RegCourse__r.Name DateOfRegistration__c |
Custom Object and their fields | In this post we used two type of custom sObject. first is Parent object (NewStudent__c) and another is child sObject (Registration__c). We are achieving that how to fetch records from two custom objects and how to delete child record in Lookup relationship.. |
Final Output
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Step 1:- Create Lightning Component : wrapperCustomObjCmp.cmp
From Developer Console >> File >> New >> Lightning Component >> wrapperCustomObjCmp.cmp
wrapperCustomObjCmp.cmp [Lightning Component File]
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<aura:component controller="wrapperCustomObjCtrCmp" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction,lightning:isUrlAddressable" access="global" > <aura:attribute name="wrapListItems" type="NewStudent__c[]"/> <aura:handler name="init" value="{!this}" action="{!c.doInit}"/> <aura:attribute name="recSelectId" type="String" default=""/> <div class="slds slds-p-horizontal--medium"> <table class="slds-table slds-table--bordered slds-table--col-bordered" style="border-collapse:collapse;"> <thead> <tr> <th>Student Name</th> <th>Address</th> <th>Email</th> <th>Registration No.</th> <th>Registered Student Name</th> <th>Registered Course Name</th> <th>Registration Date</th> <th></th> </tr> </thead> <tbody> <aura:iteration items="{!v.wrapListItems}" var="wrapVar" indexVar="index"> <tr id="{!wrapVar.recStudentId}"> <td>{!wrapVar.studentName}</td> <td>{!wrapVar.studentAddress}</td> <td>{!wrapVar.studentEmail}</td> <td>{!wrapVar.regNum}</td> <td>{!wrapVar.regStudentName}</td> <td>{!wrapVar.regCourseName}</td> <td>{!wrapVar.regDateOfReg}</td> <td> <a href="javascript:void(0);"><span class="delSpan slds-m-left--small" title="Delete" onclick="{!c.deleteRowId}" data-sfid="{!wrapVar.recStudentId}" data-index="{!index}"></span></a> </td> </tr> </aura:iteration> </tbody> </table> </div> </aura:component> |
Step 2:- Create Lightning Component : wrapperCustomObjCmpConroller.js
From Developer Console >> File >> New >> Lightning Component >> JavaScript Controller
wrapperCustomObjCmpConroller.js [JavaScript Controller]
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({ doInit : function(component, event, helper) { var action = component.get("c.appCustomWrapListMthd"); action.setCallback(this, function(response){ var state = response.getState(); if(state=='SUCCESS'){ var result = response.getReturnValue(); component.set('v.wrapListItems',result); } }); $A.enqueueAction(action); }, deleteRowId:function(component,event,helper){ var sfid = event.target.dataset.sfid; var action =component.get('c.delectRecId'); action.setParams({'delRecId':sfid}); action.setCallback(this, function(response){ var state = response.getState(); if(state == 'SUCCESS'){ var result = response.getReturnValue(); var wrapListItems = component.get( "v.wrapListItems" ); component.set( "v.wrapListItems", wrapListItems ); helper.refreshView(component); //alert('record deleted successfully'); var eventToast = $A.get("e.force:showToast"); eventToast.setParams({ "title":'Success', "type":'success', "message":'Record deleted successfully.' }); eventToast.fire(); } }); $A.enqueueAction(action); }, }) |
Step 3:- Create Lightning Component : wrapperCustomObjCmpHelper.js
From Developer Console >> File >> New >> Lightning Component >> JavaScript Helper
wrapperCustomObjCmpHelper.js [JavaScript Helper File]
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({ refreshView : function(component, event, helper) { var action = component.get("c.appCustomWrapListMthd"); action.setCallback(this, function(response){ var state = response.getState(); //alert(state); if(state=='SUCCESS'){ var result = response.getReturnValue(); // alert('result ' + JSON.stringify(result)); component.set('v.wrapListItems',result); } }); $A.enqueueAction(action); } }) |
Step 4:- Create Lightning Component Style CSS: wrapperCustomObjCmp.CSS
From Developer Console >> File >> New >> Lightning Component >> Style CSS
wrapperCustomObjCmp.CSS [JavaScript Helper File]
Note:-Static resource custom delete icon
You need to upload a custom delete icon on resource file.
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.THIS { } .THIS .slds-table thead tr th{background-color:#eee;} .THIS .slds-table thead tr th, .THIS .slds-table tbody tr td {border:1px #dddbda solid; border-collapse: collapse; white-space: normal;} .THIS .delSpan:before{content:''; width:17px; height:17px; display:inline-block; background:url(/resource/delete) no-repeat left top; background-size:cover; cursor: pointer;} |
Step 5:- Create Apex Class : wrapperCustomObjCtrCmp.apxc
From Developer Console >> File >> New >> Apex Class
wrapperCustomObjCtrCmp.apxc [Apex Class Controller]
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public class wrapperCustomObjCtrCmp { public class wrapperCustomClass{ @AuraEnabled public string studentName; @AuraEnabled public string studentEmail; @AuraEnabled public string studentAddress; @AuraEnabled public Id recStudentId; @AuraEnabled public string regNum; @AuraEnabled public string regStudentName; @AuraEnabled public string regCourseName; @AuraEnabled public date regDateOfReg; public wrapperCustomClass(string studentName, string studentEmail, string studentAddress, Id recStudentId, string regNum,string regStudentName,string regCourseName,date regDateOfReg){ this.studentName = studentName; this.studentEmail = studentEmail; this.studentAddress = studentAddress; this.recStudentId = recStudentId; this.regNum = regNum; this.regStudentName = regStudentName; this.regCourseName = regCourseName; this.regDateOfReg = regDateOfReg; } } @AuraEnabled public static List<wrapperCustomClass> appCustomWrapListMthd(){ List<NewStudent__c> newStudent = new List<NewStudent__c>(); List<Registration__c> newRegistration = new List<Registration__c>(); List<wrapperCustomClass> custWrapObj = new List<wrapperCustomClass>(); List<NewStudent__c> newStudentView =[Select Id, Name, Email__c, Address__c,(Select Id, Name, RegNewStudent__r.Name, RegCourse__r.Name, DateOfRegistration__c From Registrations__r) From NewStudent__c]; newRegistration = [Select Id, Name, RegNewStudent__r.Name, RegCourse__r.Name, DateOfRegistration__c From Registration__c ]; for(NewStudent__c studentObj:newStudentView){ for(Registration__c regObj:studentObj.Registrations__r){ custWrapObj.add(new wrapperCustomClass(studentObj.Name,studentObj.Email__c, studentObj.Address__c, studentObj.Id,regObj.Name,regObj.RegNewStudent__r.Name,regObj.RegCourse__r.Name,regObj.DateOfRegistration__c)); } } return custWrapObj; } @AuraEnabled public static List<NewStudent__c> delectRecId(Id delRecId){ delete [Select Id, (Select Id From Registrations__r Where RegNewStudent__c=:delRecId) From NewStudent__c Where Id=:delRecId]; List<NewStudent__c> listStudent = [Select Id, Name, Email__c, Address__c,(Select Id, Name, RegNewStudent__r.Name, RegCourse__r.Name, DateOfRegistration__c From Registrations__r) From NewStudent__c]; return listStudent; } } |
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Nice post very informative