Hi,

In my code i have the whole object SVC_Change_Request__c in wrapper class.But i need to pass only the Id of  SVC_Change_Request__c and map it with other fields of that object like
Map<ID,SVC_Change_Request__c > and getting that map populated in getchangerequests method in  controller code.and using that getting the value for the table in Visualforce page.How to achieve this.
Controller:
public with sharing class SVC_CR_CloneCRPackage_Ctl {
    private final static List<String> EXCLUDED_STATUSES = new List<String>{
            'Closed', 'Cancelled'
    };
     public string targetValue {get; set;}   
    private final static String EXCEPTION_NAME = 'Package already exists. Please delete the current package before cloning.';//TKT-1239114
public string url {get;set;}
    public Boolean isCompleted { get; set; }
    public Boolean getRelatedAccountOnly { get; set; }
    public SelectableChangeRequest[] changeRequests { get; set; }
    private SVC_CP_QueryBuilder changeRequestsQB;
    private SVC_CR_Package__c crPackage;
   
    public SVC_CR_CloneCRPackage_Ctl() {
         targetValue = '_blank';
        getRelatedAccountOnly = true;
        isCompleted = false;
        crPackage = getCrPackage();
        changeRequests = getChangeRequests();
    }

    private class CloneChangeRequestException extends Exception {}

    /**
     * Clones cr package to selected change requests
     */
    public PageReference clonePackageToChangeRequests() {
        
        Savepoint sp = Database.setSavepoint();
        try {
            Set<ID> crIds = new Set<ID>();
            for (SelectableChangeRequest record : changeRequests) {
                 
            if(record.selected && record.obj.Customer_Packages__r.size() > 0 ) { //TKT-1239114
              
                
              throw new CloneChangeRequestException(EXCEPTION_NAME);
                
               
            }else if (record.selected) {
               
                   crIds.add(record.obj.Id);
                
                    
                }
            }

            if (crIds.size() > 0) {
               
                return handleSuccess(SVC_CR_Package_Service.clonePackage(crIds, crPackage.Id));
               
            }
        } catch (Exception e) {
            Database.rollback(sp);
            ApexPages.addMessage(SVC_ErrorHandler.logAndConvertToApexMessage(e));
        }

        return null;
    }

    /**
     * Redirects to new package if there is one,
     * Displays list of new packages if there are many
     */
    private PageReference handleSuccess(SVC_CR_Package__c[] newPackages) {
        if (newPackages.size() == 1) {
           
            return redirect(newPackages[0].Id);
        }

        showSuccess(newPackages);
        return null;
    }

    /**
     * Displays success message with list of new packages
     */
    private void showSuccess(SVC_CR_Package__c[] newPackages) {
        for (SVC_CR_Package__c record : newPackages) {
            String message = Label.SVC_CR_ClonedPackages.replace('{0}', '/' + record.Id)
                    .replace('{1}', record.Name);

            ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.INFO, message));
        }
        ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.CONFIRM, Label.SVC_CR_ClonedPackageSuccess));
        isCompleted = true;
    }

    /**
     * Redirects back to Opportunity record
     */
    public PageReference cancel() {
        return redirect(crPackage.Id);
    }

    /**
     * Displays only change requests that has Account related to Opportunity
     */
    public void withRelatedAccount() {
        getRelatedAccountOnly = true;
        changeRequests = getChangeRequests();
    }

    /**
     * Displays all change requests
     */
    public void withAllAccounts() {
        getRelatedAccountOnly = false;
        changeRequests = getChangeRequests();
    }

    /**
     * Redirects to cr package page
     */
    private PageReference redirect(ID recordId) {
       
        PageReference retURL = new PageReference('/' + recordId);
       
        retURL.setRedirect(true);
         
        return retURL;
       
 
           }

    /**
     * Queries cr package record
     */
    private SVC_CR_Package__c getCrPackage() {
        return (SVC_CR_Package__c) SVC_CP_QueryBuilder.getInstance(SVC_CR_Package__c.SObjectType)
                .withAllFields()
                .withField('Change_Request__r.Opportunity__c')
                .withField('Change_Request__r.Account__r.Name')
                .withField('Change_Request__r.Account__r.Systems_Parent__c')
                .andWhereEq(SVC_CR_Package__c.Id, ApexPages.currentPage().getParameters().get('packageId'))
                .queryOne();
    }

    /**
     * Queries change requests
     */

    Private SelectableChangeRequest[] getChangeRequests() {
        SVC_CP_QueryBuilder changeRequestsQB = SVC_CP_QueryBuilder.getInstance(SVC_Change_Request__c.SObjectType)
                .withAllFields()
                .withFields(new String[]{
                        'Account__c', 'Account__r.Name', 'Account__r.Systems_Parent__c', 'Opportunity__c', 'Opportunity__r.Name', 'Change_Owner__c', 'Change_Owner__r.Name'
                })
                .withSubquery('Customer_Packages__r', SVC_CP_QueryBuilder.getInstance(SVC_CR_Package__c.SObjectType))//TKT-1239114
                .andWhereEq(SVC_Change_Request__c.RecordTypeId, SVC_CR_ChangeRequestService.getInstance().getProjectRecordTypeId())

//                .andWhereNotIn(
//                        SVC_Change_Request__c.Id,
//                        SVC_CP_QueryBuilder.getInstance(SVC_CR_Package__c.SObjectType)
//                                .withField(SVC_CR_Package__c.Change_Request__c)
//                                .andWhereNotIn('Change_Request__r.Status__c', EXCLUDED_STATUSES)
//                )
                .andWhereNotIn(SVC_Change_Request__c.Status__c, EXCLUDED_STATUSES);

        if (getRelatedAccountOnly) {
            Set<ID> relatedAccountIds = new Set<ID>{
                    crPackage.Change_Request__r.Account__c
            };
            if (crPackage.Change_Request__r.Account__r.Systems_Parent__c != null) {
                relatedAccountIds.add(crPackage.Change_Request__r.Account__r.Systems_Parent__c);
            }

            SVC_CP_ConditionBuilder conditionBuilder = SVC_CP_ConditionBuilder.getInstance();
            SVC_CP_ConditionBuilder.Condition[] conditions = new SVC_CP_ConditionBuilder.Condition[]{};
            conditions.add(conditionBuilder.includes('Account__r.Systems_Parent__c', relatedAccountIds));
            conditions.add(conditionBuilder.includes('Account__c', relatedAccountIds));
            changeRequestsQB.andWhere(conditionBuilder.dis(conditions));//TKT-1242443
        }

        SVC_Change_Request__c[] changeRequests = (SVC_Change_Request__c[]) changeRequestsQB.queryList();
        SelectableChangeRequest[] crs = new SelectableChangeRequest[]{
        };
           
        for (SVC_Change_Request__c cr : changeRequests) {
            crs.add(new SelectableChangeRequest(cr));

        }

        return crs;
    }

    public class SelectableChangeRequest {
        public Boolean selected { get; set; }
        //public ID changeRequestId { get;set; }
        public SVC_Change_Request__c obj { get; set; }
 
        
        public SelectableChangeRequest(SVC_Change_Request__c obj) {
            
        this.obj=obj;
        this.selected = false;
        }
    }
}
VF page:
<apex:page controller="SVC_CR_CloneCRPackage_Ctl">
   
    <apex:stylesheet value="{!URLFOR($Resource.BugPagination, 'DataTable/CSS/jquery.dataTables.min.css')}"/>
    <apex:stylesheet value="{!URLFOR($Resource.BugPagination, 'DataTable/ExternalCSS/ExternalCSS.css')}"/>
    <style>
        .message .messageText a {
            margin: 0;
            font-size: 100%;
        }
    </style>

    <script type="text/javascript" language="javascript"
            src="{!URLFOR($Resource.BugPagination, 'DataTable/JS/jquery-1.10.2.min.js')}"></script>
    <script type="text/javascript" language="javascript"
            src="{!URLFOR($Resource.BugPagination, 'DataTable/JS/jquery.dataTables.min.js')}"></script>
    <apex:includeScript value="/support/console/29.0/integration.js"/>
    <script type="text/javascript" language="javascript">
        var j$ = jQuery.noConflict();
        j$(document).ready(function() {
            initTable();
        });

        var initTable = function() {
            j$('table.dataTable').dataTable({
                "bPaginate" : true,
                "bLengthChange" : true,
                "bFilter" : true,
                "bSort" : true,
                "bInfo" : true,
                "bAutoWidth" : false,
                "scrollY": "500px",
                "columnDefs": [
                    { "orderable": false, "targets": 0 },
                ]
            });
        };
                  
                    </script>
  
    <apex:form >
        <apex:pageblock id="pbId">
            <apex:pageMessages escape="false" id="messages"/>
            <apex:pageBlockButtons id="PgButtons">
               <apex:commandButton value="Back" action="{!cancel}" immediate="true"/>
                <apex:commandLink action="{!clonePackageToChangeRequests}" target="{!targetValue}" >
       <apex:commandButton value="Clone Package To Selected CRs" />
</apex:commandLink>
    <!--  <apex:commandButton value="Clone Package To Selected CRs" action="{!clonePackageToChangeRequests}" reRender="pbId" status="fetchStatus" rendered="{!NOT(isCompleted)}"/>-->
            
            </apex:pageBlockButtons>

            <apex:outputPanel >
                <apex:actionStatus id="fetchStatus">
                    <apex:facet name="start">
                        <img src="/img/loading.gif"/>
                    </apex:facet>
                </apex:actionStatus>
            </apex:outputPanel>
             <apex:pageBlockSection id="pageSection" columns="1" rendered="{!NOT(isCompleted)}">
                <apex:outputPanel id="accountFilters">
                    <apex:commandLink action="{!withRelatedAccount}" value="Show related Account" id="relatedAccountLink" rendered="{!!getRelatedAccountOnly}"
                                      reRender="pageSection" status="fetchStatus" onComplete="initTable();"/>
                    
                   <apex:commandLink action="{!withAllAccounts}" value="Show all Accounts" id="allAccountsLink" rendered="{!getRelatedAccountOnly}"
                                      reRender="pageSection" status="fetchStatus" onComplete="initTable();"/>
                </apex:outputPanel>
                     
<apex:pageblockTable id="crTable" value="{!changeRequests}" var="item" styleClass="dataTable">
           <apex:column id="row">
                         <apex:inputCheckbox id="selectBox" value="{!item.selected}"/>
          </apex:column>
          <apex:column >
                        <apex:facet name="header">Change Request</apex:facet>
                        
                        <apex:outputLink value="/{!item.obj.Id}">{!item.obj.Name}</apex:outputLink>
          </apex:column>     
     
        <apex:repeat value="{!$ObjectType.SVC_Change_Request__c.FieldSets.PackageCloneListView}" var="f">
        <apex:column value="{!item.obj[f]}"/>
         </apex:repeat>
                   </apex:pageblockTable>           

         </apex:pageBlockSection>
        </apex:pageblock>
    </apex:form>
</apex:page>