Primary Keys

[stutteringp0et]

Documentation says:
Support for using any other than _id field as a Primary Key, for a
collection

How do I use it?

In my the generated model, there is a function "primaryKey()" that
returns '_id' by default. If I change it to 'id', nothing happens.
Data is still stored with '_id' as a MongoId Object and the 'id' field
is still empty.

[canni]

You can't change the _id field it will be there always, refer to mongo
documentation

the primaryKey() method allows You to *use* different field like it
would be a primary key (this affects to behavior of ie. findByPk()
methods)
sill You have to remember to define an unique index on field that
You'll be using as a primary key.

And mongo will not pre populate any other field than _id with
automatic MongoId object.

canni

[stutteringp0et]

I didn't realise that in order to save a value to a field, that field
needs a rule defined in the model.

[Mayur Ahir]

 These is what I am successfully doing..

class MyClass extends EMongoDocument {

public $id; //Primary Key

.
.

public function primaryKey() {

return 'id';

}
.
.
public function beforeSave() {
        if ($this->isNewRecord) {

$this->id = uniqid(); // OR $this->id = sha1(uniqid(rand(), true)) //Highly unique if you have millions of records

        }
        return parent::beforeSave();
}
.
.

}

[Attila Nagy]

On Fri, Oct 7, 2011 at 8:41 AM, Mayur Ahir <ahir...@gmail.com> wrote:
>         if ($this->isNewRecord) {
> $this->id = uniqid(); // OR $this->id = sha1(uniqid(rand(), true)) //Highly
> unique if you have millions of records
>         }

just a quick question: is it necessary to create a uniqid for your
records? YMDBS automatically sets the _id variable with a new MongoId,
that is designed to be unique among different servers too. So in most
cases you can depend on that variable. Becouse in Mongo you _must_
have an _id field, so in your example you'll have two identifiers (_id
and id) for every document.

--
Nagy Attila Gabor

[Mayur Ahir]

$model->findByPk('4ced75e1eb4ae8ca44000000'); is much simpler than $model->findByPk(new MongoID('4ced75e1eb4ae8ca44000000')); You don't need to do much migration....

[Attila Nagy]

ok, it's your choice. But Mongo let's you use other types than MongoId
for primary key also, so you could just override the beforeSave, to
generate the id's you like.

--
Nagy Attila Gabor

[Masaru Hoshi]

Mayur,

Either you choose using id or _id, MongoDb team recommends using your primary keys as binary whether it's possible as a tunning condition. 

http://www.mongodb.org/display/DOCS/Optimizing+Object+IDs

--
Mr. Masaru Hoshi | Senior Software Analyst | ho...@hoshi.com.br

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