Load entities by query

[wcooley]

Recently I used this to create a new static structure in my database -- several new nodes with their relationships linking them. But when it came time to create relationships to nodes that already existed in my database, I had to resort to doing so manually.

I'd like to be able to specify a Cypher query for nodes as a YAML type, the anchor of which can then be used as an alias in defining relationships.

e.g.:

- &node-darth-vader !!python/object/apply:gryaml.node
  - labels:
    - person

- &node-luke-skywalker !!python/object/apply:gryaml.node_query
  - cypher: MATCH (p:person{name:"Luke Skywalker"}) RETURN p

- !!python/object/apply:gryaml.rel
 - *node-darth_vader
 - father_of
 - *node-luke-skywalker