add_edge and (still) not existing vertex(es)

Usage
1

Hi everyone,
I have a CSV file with the following line(s):
ID NAME CITY ISMANAGER MGRID
where ID is a unique string and represents an employee with her name,city and is_manager attributes, followed by another ID for her manager.
I hoped I could create an edge and implicitely its two vertex if any of them was missing but that does not seem to be the case.
Is there a way for add_edge or similar function to silently create any vertex that does not exist?
To make things slightly more difficult :frowning: there might be some MGRIDs that do not have a record describing their attributes (for people reporting out of country).
Thank you for any solution.

2

While waiting for some kind expert I’ve been experimenting and am really stumped because of the last problem described.

In my program I create a vertex for every record I find and set aside a tuple in a list describing the ID - MGRID future edge.

Thought I could just use this tuple list at the end to add all edges I had accumulated but the hundred records or so which contain a MGRID that is NOT a vertex of the graph makes my program crash :frowning:
Can you please help?

I have this in the loop traversing the CSV file:

            v = g.add_vertex(name=cleanId)
            # add attributes to the vertex
            v["label"] = cleanName
            v["city"] = cleanCity
            v["ismanager"] = cleanIsMgr
            # add the edge to edges list using name of vertices
            edgelist.append(tuple((cleanIdMgr, cleanId)))

and then at the end of the loop: g.add_edges(edgelist)

which gives an error as soon as it reaches one of the tuples that has a MGRID which is not a vertex