Unable to update manage package picklist field entries using apex code (metadata API)

Question

Unable to update manage package picklist field entries using apex code (metadata API).

I tried using two ways of creating picklist values of metadata API.

Way 1:

    public static void updatePicklistField() {
      MDService.MetadataPort service = createService();
      MDService.CustomField customField = new MDService.CustomField();
      customField.fullName = 'namespacePrefix__ObjectName__c.namespacePrefix__PickList_Field__c';
      customField.label = 'Picklist Field';
      customField.type_x = 'Picklist';
      MDService.ValueSet valSet = new MDService.ValueSet();
      valSet.controllingField = 'namespacePrefix__PickList_Field__c';
      valSet.restricted = false;
      MDService.ValueSetValuesDefinition valueDef = new MDService.ValueSetValuesDefinition();
      valueDef.sorted = false;
      MDService.CustomValue value = new MDService.CustomValue();
      value.fullName = 'New Value';
      value.default_x = false ;
      value.isActive = true;
      valueDef.value = new List<MDService.CustomValue> {value};

      valSet.valueSetDefinition = valueDef;
      customField.valueSet = valSet ;
      List<MDService.SaveResult> results = service.updateMetadata(new MDService.
Metadata[] { customField });
      handleSaveResults(results);
    }

Way 2:

  public static void createPicklistEntries(String requestContext) {
    MDService.MetadataPort service = createService();
    MDService.CustomField customField = new MDService.CustomField();
    customField.fullName = 'namespacePrefix__ObjectName__c.namespacePrefix__PickList_Field__c';
    customField.label = 'Picklist Field';
    customField.type_x = 'Picklist';
    MDService.Picklist pt = new MDService.Picklist();
    pt.sorted = false;
    MDService.PicklistValue value = new MDService.PicklistValue();
    value.fullName = 'New Value';
    value.default_x = false ;
    pt.picklistValues = new List<MDService.PicklistValue>{value};
    customField.picklist = pt ;
    customFieldList.add(customField);
    List<MDService.SaveResult> results = service.updateMetadata(new MDService.Metadata[] { customField });
    handleSaveResults(results);
}

Can someone suggest some other or better way to do this?

I don't want to do this manually (adding new picklist values to picklist field).

Getting below error on execution of above code:

MetadataService.MetadataServiceException: Cannot modify managed object: entity=CustomFieldDefinition, component=00N7xxxxxxxxxxxh, field=PicklistOptionsFlagRestrictedPicklist, state=installed (CANNOT_MODIFY_MANAGED_OBJECT).

Answer 1

@ashwani - You are trying to change the field definition which is part of managed package which is not allowed. But Just adding picklist options is allowed, If you are using the Financialforce wrapper class from github, refer to the method in MetadataServiceExample to just update the picklist field with new options. MetadataService.MetadataPort service = createService();

    // Read Custom Field
    MetadataService.CustomField customField =
        (MetadataService.CustomField) service.readMetadata('CustomField',
            new String[] { 'Lead.picklist__c' }).getRecords()[0];

    // Add pick list values
    metadataservice.PicklistValue two = new metadataservice.PicklistValue();
    two.fullName= 'second';
    two.default_x=false;
    metadataservice.PicklistValue three = new metadataservice.PicklistValue();
    three.fullName= 'third';
    three.default_x=false;
    customField.picklist.picklistValues.add(two);
    customField.picklist.picklistValues.add(three);

    // Update Custom Field
    handleSaveResults(
        service.updateMetadata(
            new MetadataService.Metadata[] { customField })[0]);