contains
ReQL command: contains
Command syntax
sequence.contains([value | predicate_function, ...]) → bool r.contains(sequence, [value | predicate_function, ...]) → bool
Description
When called with values, returns True
if a sequence contains all the specified values. When called with predicate functions, returns True
if for each predicate there exists at least one element of the stream where that predicate returns True
.
Values and predicates may be mixed freely in the argument list.
Example: Has Iron Man ever fought Superman?
r.table('marvel').get('ironman')['opponents'].contains('superman').run(conn)
Example: Has Iron Man ever defeated Superman in battle?
r.table('marvel').get('ironman')['battles'].contains(lambda battle: (battle['winner'] == 'ironman') & (battle['loser'] == 'superman') ).run(conn)
Example: Use contains
with a predicate function to simulate an or
. Return the Marvel superheroes who live in Detroit, Chicago or Hoboken.
r.table('marvel').filter( lambda hero: r.expr(['Detroit', 'Chicago', 'Hoboken']).contains(hero['city']) ).run(conn)
Related commands
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https://rethinkdb.com/api/python/contains/