Hi all.
i have a problem and don't know why.

here is the gridfield:

class Partido extends Page {

	static $db = array(
		'Resultado' => 'Varchar',
		'Fecha' => 'date',
	);

	static $has_many = array(
		//'Jugadores' => 'Jugador'
		'Puntuaciones' => 'Puntuacion'
	);

	public function getCMSFields() {
		$fields = parent::getCMSFields();

		$dateField = new DateField('Fecha');
		$dateField->setConfig('showcalendar', true);
		
		$fields->addFieldToTab('Root.Main', $dateField, 'Content');
		$fields->addFieldToTab("Root.Main", new TextField("Resultado"), 'Content');
			
		$config = GridFieldConfig_RecordEditor::create();
		
		$config->getComponentByType('GridFieldDataColumns')->setDisplayFields(array(
				'Jugador.Nombre' => 'Nombre',
				'Jugador.Apellido'=> 'Apellido',
				'Puntos'=> 'Puntuacion'
		));
		
		$studentsField = new GridField(
				'Puntuaciones',
				'Puntuacion',
				$this->Puntuaciones(),
				$config
		);
		
		$fields->addFieldToTab('Root.Jugadores', $studentsField);
		return $fields;
	}
}


class Puntuacion extends DataObject {
	static $db = array(
		'Puntos' => 'Varchar',
	);
	
	static $has_one = array(
		'Jugador' => 'Jugador',
		'Partido' => 'Partido'
	);
}

works fine, when i click "add" button the admin show me this.

if I create a record, all is working.
but is not showing me the name of the "jugador", and have to solve it.

to solve it i did this to "Puntuacion"

class Puntuacion extends DataObject {
	static $db = array(
		'Puntos' => 'Varchar',
	);
	
	static $has_one = array(
		'Jugador' => 'Jugador',
		'Partido' => 'Partido'
	);
	
	
	
	public function getCMSFields() {
	
		$fields = parent::getCMSFields();
		$fields->push(new TextField('Puntos', 'Puntaje'));
				
		$jugador = Jugador::get()->byID($this->JugadorID);
		
		if($jugador){
			$field = new TextField('JugadorID', 'Jugador', $jugador->Apellido);
			$field->setDisabled(true);
			$field->performDisabledTransformation();
			$fields->push($field);
		}else{
			$fields->push(new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('Nombre', 'Apellido')));
		}		
		
		$partido = Partido::get()->byID($this->PartidoID);
		//Debug::show($this);
		
		//Debug::show();
		if($partido){
			$field = new TextField('PartidoID', 'Partido', $partido->Fecha);
			$field->setDisabled(true);
			$field->performDisabledTransformation();
			$fields->push($field);
		}else{
			$fields->push(new DropdownField('PartidoID', 'Partido', Partido::get()->map('Fecha', "Resultado")));
		}
		
				
		return $fields;
		
	}
	
	
}

now seems to be solved because now i can see de Lastname (Apellido)

But when I click the create button the player seems to not being saved

here is an image.

any help will be appreciated!!

You could try adding Summary Fields to Puntuacion, it looks as if there is a record in the last screen shot.

public static $summary_fields = array('Puntos','Partido.Resultado');

Hi Bambii7 thanks for your post, i find the problem.

the error was in the DropdownFields.

$fields->push(new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('Nombre', 'Apellido')));

Should be

$fields->push(new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('ID', 'Apellido')));

therefore the record in the table Puntuacion was created but JugadorID was empty.

anyway now i have another problem, in this part of code.

$jugador = Jugador::get()->byID($this->JugadorID);
if($jugador){
			$field = new TextField('JugadorID', 'Jugador', $jugador->Apellido);
			$field->setDisabled(true);
			$field->performDisabledTransformation();
			$fields->push($field);
		}else{
			$fields->push(new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('ID', 'Apellido')));
		}	

I verified if I go to edit a "Puntuacion"or to create a new one.

when I enter to edit one, i need to do something like this.

$field = new TextField('JugadorID', 'Jugador', 'JugadorID' => $jugador->Apellido);

note the third parameter of TExtfield, how can show the name of the "jugador" instead de ID in the textfield, but in the fact when i save it the value saved is the JugadorID

Thanks!

Solved
i change this:

$jugador = Jugador::get()->byID($this->JugadorID);
if($jugador){
			$field = new TextField('JugadorID', 'Jugador', $jugador->Apellido);
			$field->setDisabled(true);
			$field->performDisabledTransformation();
			$fields->push($field);
		}else{
			$fields->push(new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('ID', 'Apellido')));
		}	

for this:

$jugador = Jugador::get()->byID($this->JugadorID);
if($jugador){
			$field = new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('ID', "Nombre"));
			$field->setDisabled(true);
			$field->performDisabledTransformation();
			$fields->push($field);
		}else{
			$fields->push(new DropdownField('JugadorID', 'Jugador', Jugador::get()->map('ID', 'Apellido')));
		}	

Hi all!
I need help with another thing please.

once I click "add Puntuacion", how can I get the "ID" of the "Partido" to which I am adding this "Punctuacion" and then map it to show it in DropdownField

something like this, in the bolded part .

if($partido){
			
			$field = new DropdownField('PartidoID', 'Partido', Partido::get()->map('ID', "CustomTitle"));
			$field->setDisabled(true);
			$field->performDisabledTransformation();
			$fields->push($field);
		}else{
			$game = Partido::get()->byID("here the ID Of partido");
	
			$game = $game->map('ID',"Title")); //doesn't work map on byID() only on get() 

			$fields->push(new DropdownField('PartidoID', 'Partido', $game));
		}
	

Solved,

have to change this

...
$config = GridFieldConfig_RecordEditor::create();
...

for this:

...
$config = GridFieldConfig_RelationEditor::create();
...

In the config of the Gridfield, in the Partido Class.
and automatically adds the "Puntuacion to the corresponding "Partido"