Project Into New object with group.

[Mike Dobson]

Here is my simple code: 

g.addV('person').property('name', 'Mike').as('mike')

.addV('class').property('name', 'math').property('aval', 'true').as('math')

.addV('class').property('name', 'bio').property('aval', 'false').as('bio')

.addE('takes').from('mike').to('math').property('TA', 'true').property('Role', 'Admin')

.addE('takes').from('mike').to('bio').property('TA', 'false').property('Role', 'Help')

My query is:

g.V().hasLabel('person').limit(1).project('Takes').by(outE('takes').group().by().by(valueMap('Role', 'TA')))

Output:

[{

"Takes": {

"e[abf8c9fd-daec-4d12-a630-6f8903146349]080366ec-2fa1-4f30-9574-bb66cd70324f(person)-takes->db088937-bea1-4cd1-b6e8-193dff7f22ff(class)": {

"Role": "Admin",

"TA": "true"

},

"e[c22f0ae3-81bf-4ad5-a7f9-8f75db940cb8]080366ec-2fa1-4f30-9574-bb66cd70324f(person)-takes->db306807-7639-4000-b272-bbd5fef5e170(class)": {

"Role": "Help",

"TA": "false"

}

}

}]

But what i need is:

[{

"Takes": {

{

"Role": "Admin",

"TA": "true"

},

{

"Role": "Help",

"TA": "false"

}

}

}]

Basically i want to get properties from all 'takes' edges, project them as an array to 'Takes' property. I need to figure out how to get rid of the grouping header and just return an array of props.

Thanks.

[Stephen Mallette]

If all you need is the properties from the "takes" edges, then i'm not sure why you need group() at all. isn't it just:

gremlin> g.V().hasLabel('person').limit(1).project('takes').by(outE('takes').valueMap('Role', 'TA').fold())

==>[takes:[[Role:Admin,TA:true],[Role:Help,TA:false]]]

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[Mike Dobson]

Stephen, thank you. 

Can you explain significance of valueMap('Role', 'TA').fold() option. 

Why if "fold()" is omitted, we only get one "takes" edge result. 

Thanks. 

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[Stephen Mallette]

It's just a "feature" of the language. The inner traversal is iterated with next() when executed so you only get the first item out. By adding fold() you iterate the traversal to a List first and then next() out that list. 

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