Fieldsets - APEX & Visualforce

OpportunityRelatedList.vfc

<apex:page standardController="Account" extensions="OpportunityRelatedListClass" sidebar="false" showHeader="false">
    <apex:pageblock id="pb">   
          <apex:pageBlockSection collapsible="false" columns="1">
             <apex:pageBlockTable value="{!Opportunities}" var="opp" styleClass="dataTable"> 
                 <apex:column title="Edit">
                     <apex:outputLink style="color:#015ba7" value="{!URLFOR($Action.Opportunity.Edit, opp.Id, ['retURL'='/%2F'+ opp.AccountId])}" target="_top">Edit</apex:outputLink>
                 </apex:column>
                 <apex:column >
                     <apex:facet name="header">Opportunity Name</apex:facet>
                     <apex:outputLink value="/{!opp.Id}" target="_top">{!opp.Name}</apex:outputLink>
                 </apex:column>
                 <apex:repeat value="{!$ObjectType.Opportunity.fieldsets.Opportunity_RelatedList}" var="fieldValue">
                     <apex:column value="{!opp[fieldValue]}">
                     </apex:column>
                 </apex:repeat>
             </apex:pageBlockTable>
          </apex:pageBlockSection>
     </apex:pageblock>
</apex:page>

OpportunityRelatedListClass.cls

public class OpportunityRelatedListClass {
    public List<Opportunity> oppList{get;set;}
    public Account accObj = new Account();
    public String accId;
    Public Integer noOfRecords{get; set;}
    Public Integer size{get;set;}
    public Boolean hasDeleteAccess {get;set;}
    
    public OpportunityRelatedListClass(ApexPages.StandardController OppController) {
        
    }
    
    // Method to query the list of Opportunities
    public List<Opportunity> getOpportunities(){
        accId = ApexPages.CurrentPage().getparameters().get('Id');
        oppList = new List<Opportunity>();
        String query = 'SELECT ';
        for(Schema.FieldSetMember f : this.getFields()) 
        {
            query += f.getFieldPath() + ', ';
        }
        query += '  Id FROM Opportunity WHERE AccountId = :accId';   
        oppList = Database.Query(query);
        return oppList;
    }
    
    // Method to get the list of fields in the fieldsets
    public List<Schema.FieldSetMember> getFields() 
    {
        List<Schema.FieldSetMember> fm = new List<Schema.FieldSetMember>();
        return SObjectType.Opportunity.FieldSets.Opportunity_RelatedList.getFields();
    }
}