Sapalogy Interview Questions and Answers

Child records can be made read-only when parent record's field is updated using validation rules.

• Create a validation rule on child object

• Use ISCHANGED() function to check if parent field is updated

• Use PRIORVALUE() function to get the previous value of parent field

• Use ISBLANK() function to check if the previous value of parent field is blank

• Use ISNEW() function to allow creation of child records

• Use OR() function to comb...read more

To call a controller method from JavaScript in a Visualforce page, use the actionFunction tag.

• Create a controller method in the Apex class.

• Add an actionFunction tag in the Visualforce page.

• Call the actionFunction from JavaScript using its name.

• Pass parameters to the controller method using the actionFunction tag.

• Use the rerender attribute to update the page after the controller method is called.

Collection variables are used to store multiple values of the same data type in Apex.

• Collection variables include Lists, Sets, and Maps.

• Lists are ordered collections of elements that can contain duplicates.

• Sets are unordered collections of unique elements.

• Maps are collections of key-value pairs.

• Collection variables are useful for iterating over multiple values and performing operations on them.

• Example: List names = new...read more

Use data loader's parent-child functionality to load both parent and child records at once.

• Create a CSV file with both parent and child records

• Use the data loader's parent-child functionality to map the relationship between the two

• Ensure that the parent records are loaded before the child records

• Use the data loader's insert or upsert operation to load the data

Batch class and future method syntax in Salesforce development.

• Batch class syntax: Implements Database.Batchable interface, has start(), execute() and finish() methods.

• Future method syntax: Has @future annotation, returns void, takes parameters.

• Example batch class syntax: public class MyBatch implements Database.Batchable { ... }

• Example future method syntax: @future public static void myFutureMethod(String param) { ...