Dynamic Variable Names

Thank you for this package. I wanted to know if the nodes can be specified by strings

For example, I want to write a query

MATCH (n) WHERE n.root = "Something"

Now, I can do this using p.Match.node('n').Where.n.property('root') == "Something" However, I have to do this for many variables for a longer pattern in MATCH, and the name n is generated dynamically, for example it could be n1, n2, n3 etc depending on which iteration of loop it is in. Is it possible to achieve that?

I tried giving Where.raw('n') and Where._('n') but both insert a STATEMENT word in the query.

(Apologies if this is a stupid question)

[emehrkay]

I was able to get STATEMENT to print out, I think that is an error with the Anon object. I will check into it.

I did manage to get something going based on what you want using the ConditionalAND (https://github.com/emehrkay/Pypher#conditionals) object

EDGES = [(1, 'REL1', 2), (1, 'REL2', 3), (2, 'REL3', 3)]
 
node_prefix = 'n'
relation_prefix = 'r'
edges = []
_rid = 0
 
for _src_id, relation, _dst_id in EDGES:
    _rid += 1
    src_var = f'{node_prefix}{_src_id}'
    dst_var = f'{node_prefix}{_dst_id}'
    rel_var = f'{relation_prefix}{_rid}'
    edge = __.node(src_var).rel_out(rel_var, relation).node(dst_var)
    edges.append(edge)
 
 
conditions = []
 
NAMES = {'first': 'mark', 'you': 'hrshikeshrt'}
_root = 'some root value'
 
 
for _var, _name in NAMES.items():
    conditions.append(__().raw(_var).property('name') == _root)
 
p.Match(*edges)
p.WHERE(__.ConditionalAND(*conditions))
p.Return('*')

In this example I did __.() which would end up creating a new Pypher object (https://github.com/emehrkay/Pypher/blob/master/pypher/builder.py#L1264) – this is the root of the STATEMENT bug.

[emehrkay]

py2neo is great. Here is the base query method that accepts params https://py2neo.org/2021.1/workflow.html#py2neo.Graph.run