Hi guys. I have some error with update record in apex class.
I write a datatable and a button in cmp. I wanna select some rows in datatable, and change the field of selected records when i click the button.
My datatable is show a custom object called Case2__c. I wanna change a checkbox field called approvalStatus__c from false to true.
Now, when i click the button, the page haven't response. I write an alert in callback when SUCCESS, page is no alert. When i delete "update cs", page have alert.
There is my code.

Cmp:

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId" access="global" controller="shipClass">
	<aura:handler name="init" value="{!this}" action="{!c.doInit}" />
	<aura:attribute name="columns" type="List"/>
	<aura:attribute name="data" type="Object"/>
	<aura:attribute name="errors" type="Object" default="[]"/>
	<aura:attribute name="selectedCase" type="List"/>

	<lightning:card title="Ship">
	<lightning:layout  multipleRows="true">
		<lightning:layoutItem padding="around-small">
			<lightning:button name="shipButton" label="ship" onclick="{!c.ship}"/>
		</lightning:layoutItem>
	</lightning:layout>
		
		<lightning:datatable
			columns="{! v.columns }"
			data="{! v.data }"
			keyField="Id"
			errors="{! v.errors}"
			onrowselection="{!c.handleSelect}"
			hideCheckboxColumn="false"/>
	</lightning:card>
</aura:component>

 Controller:

({
    doInit : function(component, event, helper) {
    	component.set('v.columns', [
            { label: 'Case No.', fieldName: 'Name', type: 'text',editable:false},
            { label: 'Product', fieldName: 'ProductName', type: 'text',editable:false},
            { label: 'Type', fieldName: 'Customer_Type__c', type: 'text',editable:false},
            { label: 'Account', fieldName: 'AccountName', type: 'text',editable:false},
            { label: 'Amount', fieldName: 'Amount__c', type: 'number',editable:false}]);
    	helper.getShipRecord(component,event,helper); 
    },
    ship : function(component, event, helper){
      var records = component.get("v.selectedCase");
      var action = component.get("c.pass");
      action.setParam("shipList", records);
      action.setCallback(this, function(response){
        var state = response.getState();
        // call back success
        if (state == "SUCCESS"){
          alert('2');

          var a = component.get('c.doInit');
          $A.enqueueAction(a);
        }
        // call back failed
        else {
          var a = component.get('c.doInit');
          $A.enqueueAction(a);
        }
      });
      $A.enqueueAction(action);
    },
    handleSelect : function(component, event, helper){
      var selectedRows = event.getParam('selectedRows');
      var setRows = [];
      for ( var i = 0; i < selectedRows.length; i++ ) {
        setRows.push(selectedRows[i]);
      }
      component.set("v.selectedCase", setRows);
    }
})

Helper:

({
	getShipRecord : function(component, event, helper) {
		var action = component.get("c.query");
        // call back
        action.setCallback(this, function(response){
            var state = response.getState(); 
            // call back success
            if (state == "SUCCESS"){
                var rows = response.getReturnValue();
                for(var i = 0; i < rows.length; i++){
                    var row = rows[i];
                    if(row.Product__r) row.ProductName = row.Product__r.Name;
                    if(row.Account__r) row.AccountName = row.Account__r.Name;
                }
                component.set('v.data', rows);
            }
            // call back failed
            else {
                var toastEvent=$A.get("e.force:showToast");
                toastEvent.setParams({
                    "title":'Error!',
                    "message":'Get Record Failed!',
                    "duration":5000,
                    "type":ERROR
                });
                toastEvent.fire();
            }
        });
        $A.enqueueAction(action);
	}
})

Apex class:

public class shipClass {
    @AuraEnabled
    public static List<Case2__c> query() {
        List<Case2__c> ship = new List<Case2__c>();
        ship = [SELECT Name,Product__r.Name,Account__r.Name,Customer_Type__c,Amount__c FROM Case2__c 
        		WHERE Type__c = 'ship' AND ApprovalStatus__c = false 
        		ORDER BY Account__r.Name ASC];
        return ship;
    }
    @AuraEnabled
    public static void pass(List<Case2__c> shipList) {
    	for(Case2__c a : shipList){
    		List<Case2__c> csList = [SELECT Id,Name,ApprovalStatus__c FROM Case2__c WHERE Name = :a.Name];
    		if(csList.size() > 0){
    			Case2__c cs = csList[0];
    			cs.ApprovalStatus__c = true;
    			update cs;
    		}
    		
    	}
    }
}

How can i fix that. Pls help me. Tanks very much.