create relationships between nodes in parallel - cypher

Question

Using cypher and neo4j 2.0.
Given two sets of node ids (of equal length) and a set of weights, I'd like to create a relationship between the corresponding nodes and set the weight as a property. For example if I have the following three lists:
node list 1: (101, 201, 301)
node list 2: (102, 202, 302)
weights: (0.1, 0.6, 0.25)
I would like to create the following representation
101 - knows {w : .1} - 102
201 - knows {w : .6} - 202
301 - knows {w : .25} - 302
but NOT, for example, 101 - knows - 302
I can do this by iterating over my parameters and then creating the individual queries.
Is there a way to batch run this, passing my lsits as parameters and asking
cypher to match the nodes & properties in order?
I thought for a moment that using parameters in the following fashion would work, but it instead creates all permutations of relationships (as expected) and assigns as the entire list of weights as a property to each relationship.
{
"query":
"START a1=node({starts}), a2=node({ends})
CREATE UNIQUE a1-[r:knows {w : {weights}}]-a2
RETURN type(r), r.w, a1.name, a2.name",
"params": {
"starts" : [101, 201, 301],
"ends" : [102, 202, 302],
"weights" : [0.1, 0.6, 0.25]
}
}

Answer 1

How large are your lists in real life?
I'd probably send in one triple at a time.
Otherwise you should be able to use a collection and foreach to do what you want:
START a1=node({starts}), a2=node({ends})
FOREACH(w in filter(w in weights : head(w)=id(a1) AND head(tail(w))=id(a2)) :
CREATE UNIQUE a1-[r:knows {w : last(w)}]-a2
)
"params": {
"starts" : [101, 201, 301],
"ends" : [102, 202, 302],
"weights" : [[101,102,0.1], [201,202,0.6], [301,302,0.25]]
}