How to compare boolean value of records during Integration run(batch apex)

Question

I'm trying to update a lookup field based on a check box field. The apex code runs fine when a single record is edited. The problem comes when integration runs and thousand of records getting updated, the look up field not getting updated. I believe it's when records process during parallel processing the map stores all of the batch records and loop checks for check box flag which is true or false.

map<Boolean,Id> mapCheck = new map<Boolean,Id>();
map<Boolean,Id> ParCheck = new map<Boolean,Id>();
for(Payroll__c pp:newList){
    mapCheck.put(pp.Tip__c,pp.id); (Tip is checkbox of child record)
}
for(Payroll p1:[SELECT Id, Entity__c,Tip__c 
                FROM Service_Catalog_Number_Line__c 
                WHERE Entity__c=true]){
    if( mapCheck.containskey(p1.Tip__c)) {
        parCheck.put(p1.Tip__c,p1.id); //Finding parent record that matches with child
    }                                        
}

In the above code, mapCheck gets either true or false for thousand of records and during parallel processing it checks and there will always be both true and false values in MapCheck. How to solve this. Note: it works perfectly fine if we are updating 1 record or 1 batch but it doesn't work when there are multiple batches run during parallel processing

Answer 1

In this scenario you need to change your logic. 1- Create set of parentId by traversing on newList. 2- Create a map Map<ParentId,ParentTip>by querying parentRecord where Id In set that you created in step 1. 3- At last you can traverse to newlist again and check Tip value of parent based on step 2 map and match with childRecord Tip in newList value and do your logic.