Creating edge between non-vertex classes

[Anthony Hebig]

Hi,

I'm working with OrientDb community version 2.1-rc3. (database type is "graph")

I've been doing some tests with OrientDbStudio (and you can easily reproduce these steps) :

- create a new class : Class1 (with some properties or not), no superClass

- create a new class : Class2 (with some properties or not), no superClass

- create a new record for Class1, let's say it has the following rid : #10:0

- create a new record for Class2, let's say it has the following rid : #11:0

- then you can do this : "create edge E from #10:0 to #11:0" and it works fine.

So what's the point of extending V for a class ?

And what's the difference between the "create vertex" command and creating a new "normal" record ?

Thanks for you time :)

[SavioL]

Hi anthony,

maybe it could help you to the answer given to a similar question concerning the extension of class V and E: "Another question on basic concepts"

For the second question, what you mean by "creating a new 'normal' record"?

regards,
Savio L.

[James Wang]

supreclass V so you can use the ETL tool to import massive data :D

[Riccardo Tasso]

Hi,

  the V class is a convenience to declare a document as a node of your graph. CREATE VERTEX command is simply a way to create a document inside class V.

I think that if you use graph api using classes which doesn't extend V should bring you to errors.

Cheers,

   Riccardo

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[Anthony Hebig]

In the topic "Another question on basic concepts" it is said that "when using Graph API your elements have to be instances of V and E". 

OK, but I'm just surprised there is no error at all when I create an Edge between two records that doesn't extends V.

On the other side, I have an error when I try to do "create vertex" with a class that doesn't extends V.

By "creating a new normal record" I mean a regular "insert" or with the "New record" button in OrientDb Studio

[Luigi Dell'Aquila]

Hi Anthony,

I agree with you, that statement should result in an error. Could you please open an issue about that?

Thanks

Luigi

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[Anthony Hebig]

Done. https://github.com/orientechnologies/orientdb/issues/4372