Question with the ID field

[Eric Ponce]

Hello!

When we create objects in geddy, these have one id field like: 6C45ABD6-8BF4-48B7-9E3A-BC92ADFACF66

It's unique or it's possible that another object has an equal id?

thanks!!!!

[Miguel Madero]

Generated GUIDs are guaranteed to be unique. Unless of course you explicitly copy the value from an existing one, since it's a primary key it should fail if you happen to do that.

 

Miguel

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[Eric Ponce]

Thanks! Im only asking about new objects without any modifications. ;)

[Miguel Madero]

Yes, those ones will always be unique. Geddy will generate a different one of each object. 

There's some info about GUIDs in wikipedia, but the bottom line is that the algorithm used guarantees uniqueness across objects and computers in the network. 

Miguel

[Miguel Madero]

Uups, I missed the link

http://en.wikipedia.org/wiki/Globally_unique_identifier

Miguel

[Eric Ponce]

Wow thanks!!!

2^122 id's.....impossible repeat haha

[Miguel Madero]

You're welcome :) 

Miguel

[Hayrettin Calboru]

Hi All,

Where is this id is injected? I could not able to find in the source.

Anyone knows?

Regards,

Hayri

[Matthew Eernisse]

This happens at the DB adapter layer. In the "model" project (https://github.com/mde/model):

$ ack uuid lib
lib/adapters/base_adapter.js
31:    data.id = utils.string.uuid()

lib/adapters/memory/index.js
200:      var id = utils.string.uuid();

lib/adapters/mongo/index.js
290:        id = utils.string.uuid();

lib/adapters/riak/index.js
314:        id = utils.string.uuid();

lib/adapters/sql/base.js
135:      item.id = utils.string.uuid();