Syntax

Operator

Name	Syntax	Example
equal	=, ==, :	field: 'hello'
not equal	!=	field != world
greater than	>	nested.field > 0
greater equal	>=	field >= 11.5
less than	<	field < 5
less equal	<=	field <= 5.155
exists	:*	field_a:*
not exists	:!	field_b:!
in	@	field_b @ [1,2,"world"]
not in	!@	field_b !@ [true,false]
and	and(case-insensitive)	(field_a:1 and field_b:true) or field_b:false
or	or(case-insensitive)	field_a@[1,2,3] or field_b==1

Data type

Name	Example
integer	1, 0, -1
float	3.1415926, -5.6
string	"hello tom", 'world', no_quote
boolean	true, false (case-insensitive)
array	[1,2], [1 2], ["1",2,true]

Grammar defines see mongoengine_dsl/lexer/MongoEngineDSL.g4