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From "Marko A. Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TINKERPOP3-799) [Proposal] with()-modulator for stream level variable binding.
Date Wed, 05 Aug 2015 02:44:04 GMT
Marko A. Rodriguez created TINKERPOP3-799:
---------------------------------------------

             Summary: [Proposal] with()-modulator for stream level variable binding.
                 Key: TINKERPOP3-799
                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-799
             Project: TinkerPop 3
          Issue Type: Bug
            Reporter: Marko A. Rodriguez


Arguments for steps are defined by the user and are not changeable for the life of the traversal.
In most situations, this is fine. However, for the graph mutation steps (e.g. {{addV}}, {{addOutE}},
{{property}}), this can be limiting. Many times you want to change an argument based upon
information within the traversal. To do this, I propose the following new modulator methods:

1. {{with(string,traversal)}}
2. {{with(string,object)}}
3. {{with(string,function)}} 

How does it work?

{code}
// create a bi-directional graph
g.V().as('a').outE().as('b').inV().
  addOutE('label','a','weight','w').
    with('label',select('b').label()).
    with('a',select('a')).
    with('w',select('b').values('weight'))
{code}

In this way, the edge label and properties are dynamically determined by the respective {{with()}}
variable.

{code}
// create a bi-directional graph
g.V().as('a').outE().as('b').inV().
  addOutE('label','a','properties').
    with('label',select('b').label()).
    with('a',select('a')).
    with('properties',select('b').valueMap())
{code}

I think this will also come into play with the math operators of [#TINKERPOP3-761]. For instance:

{code}
g.V().outE().as('b').inV().values('energy').
  mult('x').with('x',select('b').values('weight'))
{code}

Are there other steps that would (reasonably) benefit from {{with()}}-modulation? Is {{with()}}
a good word or is it a reserved word in other programming languages?



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