where
Filters based on a predicate, a sideEffect or a traversal.
Synopsis
where()| Syntax conventions | Description |
|---|---|
| Lowercase and uppercase | Literal keyword. Includes (). |
Italics |
Variable value. Replace with a user-defined value. |
[] |
Optional. Square brackets ( [] ) surround
optional command arguments. Do not type the square brackets. |
{} |
Group. Braces ( {} ) identify a group to choose
from. Do not type the braces. |
| |
Or. A vertical bar ( | ) separates alternative
elements. Type any one of the elements. Do not type the vertical
bar. |
... |
Repeatable. An ellipsis ( ... ) indicates that
you can repeat the syntax element as often as required. |
Description
The where() step is a filter step
that filters the returned objects based on a predicate, a sideEffect, or a
traversal.
Examples
First find all the reviewers that rated Beef Bourguignon 5-stars. Then find what
other recipes those reviewers rated 5-stars, and count how many reviewers did by recipe,
without including Beef Bourguignon in the count. It illustrates the use of the
where() step with where(neq('a')) to exclude Beef
Bourguignon.g.V().has('recipe', 'name', 'Beef Bourguignon').as('a').
inE('reviewed').has('stars', 5).outV().outE('reviewed').has('stars', 5).
inV().where(neq('a')).groupCount().by('name')