Salesforce Apex : Dynamic SOQL Querying with uncertain relationship

Queries that involve complex relationship can be handled easily using List Methods.

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Salesforce Lightning : Show or Hide a Modal

Modal popup can be added using SLDS as shown here.
It can be shown or hidden in two ways:

1. Using CSS Class
2. Using attribute variable

Salesforce Apex : Evaluate Boolean String Expression

(FALSE AND ((TRUE OR FALSE) AND (TRUE OR FALSE)))

Wondering how to evaluate this expression which is a string using Apex?

Following class can be used to evaluate:

Salesforce: Making a Trigger to execute at last

I had an After trigger in a Grand-child object that does some calculations with Child object and updates the result in Parent object. All the calculation logic were perfectly alright. But the result was wrong!

Salesforce Lightning : Display custom values for Checkbox / Boolean

Often times when we display the value of Checkbox or Boolean Attribute, we happen to see true or false getting rendered as its value. When we need custom values (like Yes/No) to be rendered on the screen, you can use ui:outputText

Salesforce: Display Related Files of Parent in Child Record

To display files of Parent Record in Child Record as a Related List, you can make use of <apex:relatedList>

Salesforce Apex : Writing Unit Test for ContentDocument

Salesforce’s SObject – ContentDocument supports only SELECT and DELETE operation. However INSERTing the document may be needed for writing Unit Tests which is not supported. There needs to be a workaround for it.