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POpy2neo: batch create indexed node with multiple key:value pairs
 

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  1. POpy2neo: batch create indexed node with multiple key:value pairs
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    <p>With </p> <pre><code>batch = neo4j.WriteBatch(graph_db) for n in nodes: batch.create_indexed_node_or_fail(index, key, value, {node properties}) batch.submit() </code></pre> <p>you can easily create indexed nodes in a batch.</p> <p>But how can I create a node in a batch and add multiple key:value pairs at the same time? Or add the node to multiple indices? </p> <p>One idea I thought of is to first create the nodes and then add them to the indices in a second batch:</p> <pre><code>for n in nodes: batch.create({node properties}) results = batch.submit() for r in results: batch add node to index1 batch add node to index2 batch.submit() </code></pre> <p>But this seems to complicated. Py2neo is so amazing, there must be an easier way.</p> <hr> <p>Based on Nigel's answer, I tried to this for a list of nodes:</p> <pre><code>batch = neo4j.WriteBatch(graph_db) item_in_batch = 0 for n in list_of_nodes: batch.create(n) # this works, all nodes are created batch.add_indexed_node("people", "key", "value from n", item_in_batch) batch.add_indexed_node("people", "key2", "other value from n", item_in_batch) i += 1 batch.submit() </code></pre> <p>Some nodes end up in my index, but not all. When I search the index for ('key:value-from-n") it returns a node but not the correct one. How can I access the 'internal' ID of the nodes when I try to add them to an index? </p> <hr> <p>I tried the (currently testing) version 1.6.0 of py2neo and it works! </p> <pre><code>n = batch.create(node) </code></pre> <p>now returns a request object which can be used within the batch to refer to the node.</p> <p>An example is in the <a href="http://book.py2neo.org/en/release-1.6.0/batches/#py2neo.neo4j.WriteBatch.create" rel="nofollow">docs for 1.6.0</a></p>
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