Mongo Document Id

[ajinkya prabhune]

Hello

I have been working with mongo for a long time now.

But I was curious to know that whether it is possible to have the auto generated doc _id 

before a document is inserted in the mongodb ?

I am using Mongo Java Library.

--
Thank you and Regards
Ajinkya Prabhune

[Karl Seguin]

org.bson.types.ObjectId has a static "get" method. You can use that to get the id and assign it to your objects explicitly. The driver will know that this is a new id and do an insert rather than an update.

Karl

[Stuart Johnson]

You can create your own _id if you want. Insertion just generates one
for you if it's not included in your document. _id usually has the
inserton time embedded into it, but I sometimes use it as an alternative
to a separate indexed Date/Time field, and set it accordingly.

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[Sam Millman]

There are ways in many languages to know this however I will talk about PHP cos tbh that's the only one I know when it comes to Mongo (haven't used Mongo with other languages). I am sure there are similar bindings in all languages.

This will allow you to have an _id prior to insertion and use that _id to force the _id of that document to that value:

$id = new MongoId(); // Lets make a new _id

$db->insert(array('_id' => $id, 'name' => 'sam')) // Lets save a document with this id

Then you can use the $id to know the id before insert.

After insert doc will have _id field too.

On 14 October 2011 14:08, Stuart Johnson <stu...@stu.org.uk> wrote:

You can create your own _id if you want.  Insertion just generates one for you if it's not included in your document.  _id usually has the inserton time embedded into it, but I sometimes use it as an alternative to a separate indexed Date/Time field, and set it accordingly.

On 14/10/11 13:55, ajinkya prabhune wrote:

Hello

I have been working with mongo for a long time now.
But I was curious to know that whether it is possible to have the auto generated doc _id
before a document is inserted in the mongodb ?

I am using Mongo Java Library.



--
Thank you and Regards
Ajinkya Prabhune

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[ajax]

Hello Guys,

Sorry for the late reply....
I am looking into ur suggestions.
and thanks for the help it has given me a guideline to do further
work.

thanks