unknown method 'opportunity.save()'

Question

I am new in salesforce development.I am started learning visualforce. Please help to resolve this issue.

Vf page :

<apex:page controller="UpdateOpportunity">
    <apex:form>
        <apex:pageBlock title="Opportunity_list">
            
                <apex:pageBlockTable value="{!OpptyDetail}" var = "opporty">
                <apex:inputField value = "{!opporty.Name}"/>
                  <apex:inputField value = "{!opporty.StageName}"/>    
                
            </apex:pageBlockTable>
            
            <apex:pageBlockButtons >
                <apex:commandButton action="{!Save}" value="Save"/>
                <apex:commandButton action="{!cancel}" value="Cancel"/>
            </apex:pageBlockButtons>
                </apex:pageBlock>
    </apex:form>
</apex:page>

Apex Class:

public class UpdateOpportunity {
    public List<Opportunity> getOpptyDetail(){
        List<Opportunity> opptylist =[SELECT Id,Name,StageName FROM opportunity WHERE StageName = 'Prospecting'];
        return opptylist;
        
    }
}

It's thrown error:Unknown method UpdateOpportunity.Save()

Answer 1

I would recommend to go through this trailhead module to get started with Visualforce.

To answer your question, your Visualforce page is using Custom Controller. So in order for your code to work, you must define you own save() method in the controller class.

Save and Cancel are standard controller methods. Unless you use standardController, it won't work.

---

Edit: Some changes needed in your custom controller class. You need to define a variable to hold the list of Opportunity records for update later, and implement a save() method to call the DML update.

public class UpdateOpportunity {
    List<Opportunity> opportunities = new List<Opportunity>();

    public UpdateOpportunity() {
        opportunities = [SELECT Id,Name,StageName FROM opportunity WHERE StageName = 'Prospecting'];
    }

    public List<Opportunity> getOpptyDetail(){
        return opportunities;
    }

    public PageReference save() {
        update(opportunities);
        return null;
    }
}

The example above is actually very similar to Salesforce Documentation.