mongodb ODM missing support for . notation

[ghost]

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[Abhoryo]

I've try a little mongodb but it is very instable on windows. And I'm not enought skilled with this ODM.

[mamamiapeguin]

Actually '.' notation works well when executing the query. The following filling record into row caused the data missing.
So I added the logic to handle '.' notation at APY\DataGridBundle\Grid\Source\Document::execute() line 205

foreach ($columns as $column) {
      $hierarchy = explode('.', $column->getId());
      $length = count($hierarchy);
      $node = $resource;
      for ($i = 0; $i < $length; $i++) {
            if (isset($node)) {
                 $node = $this->getClassProperties($node);
                 $node = $node[strtolower($hierarchy[$i])];
            }
      }
      $row->setField($column->getId(), $node);
}

In case of annotation field differs in uppercase/lowercase from actual class property , I had them unified in lowercase:

$result[strtolower($property->getName())] = $property->getValue($obj);

To access referenced document's property, the referenced document's id is a must whatever actual property is eventually retrieved.
At class annotation:

@GRID\Source(columns = "id, owner.id, owner.username")

At property annotation:

@GRID\Column(field = "owner.id", visible = false)
@GRID\Column(field = "owner.username")

@Abhoryo , could you merge my pull request #674 and add the reference document usage to the Guide.
Thanks