Create new entries in an empty JanusGraph with Gremlinpython

[Benjamin Ricaud]

Hi,

I want to handle myself the cardinality of the node properties in my graph so I have put in my graph.properties

```

schema.default=none

```

I am using JausGraph 0.1.1 with Gremlin server 3.2.3.

I start with an empty graph.

When I want to create my first node in python:

```

graph = Graph()

g = self.graph.traversal().withRemote(

DriverRemoteConnection('ws://'+server_address+'/gremlin','g', message_serializer=GraphSONSerializersV2d0())

)

vertex = g.addV('word').property('node_id','id_1').next()

```

I get:

```

gremlin_python.driver.protocol.GremlinServerError: 500: Vertex Label with given name does not exist: word

```

It seems that Janusgraph is first expecting that we define what will be the nodes label and properties before starting creating entries. 

I have seen you can do that in java here: http://docs.janusgraph.org/latest/schema.html

But I can't figure out how to do it with gremlinpython. Any solution?

Benjamin

[David Brown]

Hi Benjamin,

How about submitting your schema definition as a string with the gremlinpython client? Here is an untested example:

from gremlin_python.driver.client import Client
client = Client('ws://localhost:45940/gremlin', 'g')
schema_def = """mgmt = graph.openManagement()
                word = mgmt.makeVertexLabel('word').make()
                node_id = mgmt.makePropertyKey('node_id').dataType(String.class).cardinality(Cardinality.SINGLE).make()"""
result_set = client.submit(schema_def)
result_set.all()

[David Brown]

Sorry, add you will need to commit the schema. Add this to the schema string:

"mgmt.commit()"

[Benjamin Ricaud]

Thanks very much David! It works. This is exactly what I needed.