Jarves\Admin\FieldTypes\TypeObject::getColumns PHP Method

    public function getColumns()
    {
        if (AbstractStorage::MANY_TO_ONE == $this->getFieldDefinition()->getObjectRelation() || AbstractStorage::ONE_TO_ONE == $this->getFieldDefinition()->getObjectRelation()) {
            $foreignObjectDefinition = $this->objects->getDefinition($this->getFieldDefinition()->getObject());
            if (!$foreignObjectDefinition) {
                throw new ObjectNotFoundException(sprintf('ObjectKey `%s` not found in field `%s` of object `%s`', $this->getFieldDefinition()->getObject(), $this->getFieldDefinition()->getId(), $this->getFieldDefinition()->getObjectDefinition()->getId()));
            }
            /** @var $columns ColumnDefinition[] */
            $columns = [];
            foreach ($foreignObjectDefinition->getPrimaryKeys() as $pk) {
                $fieldColumns = $pk->getFieldType()->getColumns();
                $columns = array_merge($columns, $fieldColumns);
            }
            //rename columns to fieldId+column.id
            foreach ($columns as &$column) {
                $column = clone $column;
                $column->setName($this->getFieldDefinition()->getId() . ucfirst($column->getName()));
            }
            return $columns;
        }
        return [];
    }