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POUnderstanding Neo4j, creating unique nodes
 

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    <p>I'm trying to wrap my head around how Neo4j works and how I can apply it to my problem. I thought it should be really easy and a matter of minutes, but I'm stuck.</p> <p>I have data in MongoDB, say <code>User</code> and <code>Item</code>. What I want is connecting <code>User</code> and <code>Item</code> in a graph with a <code>LIKE</code> relationship (maybe with a <code>score</code>). Later I want to do things like recommending items based on connections, basic stuff.</p> <p>But how do I get the data into Neo4j? Every document in MongoDB has an unique <code>_id</code>, so I though I could just throw both <code>_id</code>s into Neo4j and have them connected. What I found so far is that it's not even possible to have unique nodes based on the <code>_id</code> field (Neo4j has numeric incremented ids), which is only possible with some "hack" (<a href="https://github.com/jexp/app-net-graph/blob/master/lib/appnet.rb#L11" rel="nofollow">https://github.com/jexp/app-net-graph/blob/master/lib/appnet.rb#L11</a>) or using <code>MERGE</code> (I'm stuck on &lt; 2.0). Even their examples on the website add the same node again if executed multiple times. I think I have a fundamental misunderstanding of how to use Neo4j. Maybe I'm too spoiled by redis, where I can put strings in and and <em>it just works</em>. Redis' sets aren't feasible though for complex graphs, only for simple connections.</p> <p>Maybe someone can help me with a simple cypher example of how to add two nodes <code>foo</code> and <code>bar</code> and have them connected with a <code>LIKE</code> connection. And the operation should be idempotent, no matter if none or all of the nodes/relationships already existed before execution.</p> <p>I'm accessing Neo4j via REST, in particular using this node module <a href="https://github.com/thingdom/node-neo4j" rel="nofollow">https://github.com/thingdom/node-neo4j</a></p>
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