graph.create_edge object has no attribute '_id'

[cegprakash]

I don't like raw queries. So I'm trying to create an edge using

graph.create_edge(Friend, orientRecord1, orientRecord2)

But I get AttributeError: 'OrientRecord' object has no attribute '_id'

because orientRecord does not have an _id in it. What am I doing wrong?

[cegprakash]

https://stackoverflow.com/questions/51703088/create-an-edge-in-orientdb-without-using-raw-query

[tommykennedy]

Do you have any example project to see how you implemented the OGM with Django?

[cegprakash]

Here are my class structures

class Person(Node):
    id = String(unique = True)
    name = String()
    pass


class Friend(Relationship):
    pass

Here is a query that I use to fetch orientRecords and trying to create an edge

data = client.command("SELECT FROM Person WHERE name = 'Prakash'")
print(len(data))
if len(data) == 1:
    prakash = data[0]
    print(prakash.oRecordData['name'])

data = client.command("SELECT FROM Person WHERE name = 'Brian'")
print(len(data))
if len(data) == 1:
    brian = data[0]
    print(brian.oRecordData['name'])


#cmd = graph.create_edge_command(Friend, prakash, brian)

[tommykennedy]

Thanks!

Im struggling with the connection settings for orient. How did you set up your settings.py file?

[cegprakash]

What is the error that you get?

…

On Tue, Aug 14, 2018, 2:49 PM Tom Kennedy ***@***.***> wrote: Thanks! Im struggling with the connection settings for orient. How did you set up your settings.py file? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#274 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABOgiBpsh9svx8ZYmoYTlqnnzwtc1vK5ks5uQpYpgaJpZM4VsS_A> .

[tommykennedy]

I am not at the stage of getting an error. I am new to Django and I am struggling to set up the connections to the database. Is it possible to share a sample of how to configure this?

[nikulukani]

The graph.create_edge command expects objects that are subclasses of vertex, and not raw OrientRecords.

For your code, one way to use create_edge would be along the following lines

graph.create_edge(Friend, graph.get_element(prakash._rid), graph.get_element(brian._rid))

However, I would suggest to modify your code so that you use the OGM exclusively and do no mix low-level queries with the OGM unless absolutely necessary.

from pyorient.ogm import Graph, Config
from pyorient.ogm.declarative import declarative_node, declarative_relationship
from pyorient.serializations import OrientSerialization

Node = declarative_node()
Relationship = declarative_relationship()

class Person(Node):
    element_type = 'Person'
    element_plural = 'Persons'
    id = String(unique = True)
    name = String()

class Friend(Relationship):
    label = 'Friend'

graph = Graph(Config.from_url('<db_url>','<uname>', '<pass>', initial_drop=False,
                                     serialization_type=OrientSerialization.Binary))

# If the classes already exists in your db schema, use include instead of create_all
# which will be a lot faster.
# Even if the classes do not exist, you only need to run create_all the first time after
# adding any additional classes above. Use graph.include once the classes are
# created in your db
graph.create_all(Node.registry)
graph.create_all(Relationship.registry)
# graph.include(Node.registry)
# graph.include(Relationship.registry)

prakash = graph.Persons.create(name='Prakash', id='1')
brian = graph.Persons.create(name='Brian', id='2')

prakash2 = graph.Persons.query(name='Prakash').first()
brian2 = graph.Persons.query(name='Brian').first()

graph.Friend.create(prakash, brian)
# graph.Friend.create(prakash2, brian2)  # Same as above

[cegprakash]

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