在MongoDB文档中嵌入许多字符串？

Question

I need to have a simple array/collection of strings in my Document, but cannot work out a way to acheive this with Doctrine ODM.

This is an example class/document, with $tags needing to be a simple array of strings:

namespace Acme\ExampleBundle\Document;
use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;

/** @MongoDB\Document */
class MyDocument {

    /** @MongoDB\Id */
    protected $id;

    /** @MongoDB\String */
    protected $name;

    /** @MongoDB\EmbedMany */
    protected $tags = array();
}

I've tried different things like @MongoDB\EmbedMany or @MongoDB\EmbedMany(targetDocument="String") I know there is no reason for the last one to work, but I was just trying anything I could think of.

The end result in the Mongo DB as JSON is as simple as this:

{
    "_id": ObjectId("a0afa410caeea70de1000000"),
    "name": "Example Name",
    "tags": ["tag1", "example", "test tag"]
}

What I need help with is, how to have the @MongoDB\EmbedMany annotation to allow me to add only strings into the Collection, which will then look like the above JSON when persisted to the DB.

I hope someone can help, as I'm really stuck with this now. It feels like it should be so simple!

Answer 1

Doctrine MongoDB ODM calls the mapping type for arrays "Hash", which is a little confusing. Your class would look like this:

namespace Acme\ExampleBundle\Document;
use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;

/** @MongoDB\Document */
class MyDocument {

    // ...

    /** @MongoDB\Hash */
    protected $tags = array();
}

Flushing to MongoDB should result in an hash stored inside your collection as you described in your question.

For further reference, have a look at the HashType implementation