Python, bulbs, resxter .Simplest way to check existing edge to prevent duplicate edges between a set of vertices

[Jinal Kothari]

This question is also on stackoverflow.

I am writing python scripts to extract data from multiple sources and put it in a graph in certain structure.

I am using bulbs models for all the data. I have models for all relevant node types and relationships. My edge models have not additional properties except name.

As it is in development I run the same script multiple times. I use get_or_create to prevent duplicate nodes but edges do not have that method. I do not have the object for existing edge since it was created in a previous run of the script.

I saw several question talking about similar things with answers from espeed like this, but I could not find a satisfactory answer for my specific issue.

What would be the simplest code for this method:

def check_edge(g, parent_v, child_v, rel_label):

[Stephen Mallette]

Answered: http://stackoverflow.com/a/29275821/1831717

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[Jinal Kothari]

Hey stephen, thanks for the quick answer! The code you mentioned, is it meant to be Gremlin? Bulbs does not seem to have a retain() method. I can manage to run gremlin strings via bulbs.

[Stephen Mallette]

Yes it is gremlin code.

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[Jinal Kothari]

I am using the following function defined in my gremlin.groovy script file.

def is_connected(parent, child, edge_label) {
    return g.v(parent).out(edge_label).retain([g.v(child)]).hasNext()
}

To use from python, I do this:

g.scripts.update('gremlin_scripts/gremlin.groovy')
script = g.scripts.get('gremlin:is_connected')
params = dict(parent=parent_node.eid, child=menu_item_v.eid, edge_label='has_sub_menu_item')
response = g.gremlin.execute(script, params)

I can't quite figure out how to get the bool result into python. I've also tried the g.gremlin.query(script, param)

Any ideas?