FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

Fauna accounts created after August 21, 2024 must use FQL v10. These accounts will not be able to run FQL v4 queries or access the v4 Dashboard.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.

`ContainsValue`

This reference topic applies to FQL v4. Go to this page for the latest FQL v10 reference topics.

ContainsValue( value, in )

containsValue( value, in )

ContainsValue( value, in )

ContainsValue( value, in )

ContainsValue( value, in )

ContainsValue( value, in )

Description

The ContainsValue function returns true if the specified value exists within the result of the in expression, or false otherwise.

ContainsValue is useful when you need to distinguish between object, arrays, or documents that contain a value (regardless of field name) and those that do not.

ContainsValue does not evaluate nested arrays or objects. If you need to determine whether a value exists within a complex structure, the Select function can be used to target the appropriate section within a structure.

Parameters

Parameter Type Definition and Requirements

Parameter	Type	Definition and Requirements
`value`	Any	A value of any type.
`in`	Any	A value of any type.

value

Any

A value of any type.

in

Any

A value of any type.

Returns

A Boolean value that indicates whether value exists within in.

Examples

The following query returns true because the value 3 exists in the provided object:

client.query(
  q.ContainsValue(
    3,
    {
      a: 1,
      b: 2,
      c: 3,
    },
  )
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

true

result = client.query(
  q.contains_value(
    3,
    {
      "a": 1,
      "b": 2,
      "c": 3
    }
  )
)
print(result)

True

result, err := client.Query(
	f.ContainsValue(
		3,
		f.Obj{
			"a": 1,
			"b": 2,
			"c": 3 }))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

true

try
{
    Value result = await client.Query(
        ContainsValue(
            3,
            Obj(
                "a", 1,
                "b", 2,
                "c", 3
            )
        )
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

BooleanV(True)

System.out.println(
    client.query(
        ContainsValue(
            Value(3),
            Obj(
                "a", Value(1),
                "b", Value(2),
                "c", Value(3)
            )
        )
    )
    .get());

true

ContainsValue(
  3,
  {
    'a': 1,
    'b': 2,
    'c': 3,
  },
)

true

Query metrics:

bytesIn: 56
bytesOut: 17
computeOps: 1
readOps: 0
writeOps: 0
readBytes: 0
writeBytes: 0
queryTime: 1ms
retries: 0

The following query returns false because the value 7 does not exist in the provided object:

client.query(
  q.ContainsValue(
    7,
    {
      a: 1,
      b: 2,
      c: 3,
    },
  )
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

false

result = client.query(
  q.contains_value(
    7,
    {
      "a": 1,
      "b": 2,
      "c": 3
    }
  )
)
print(result)

False

result, err := client.Query(
	f.ContainsValue(
		7,
		f.Obj{
			"a": 1,
			"b": 2,
			"c": 3 }))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

false

try
{
    Value result = await client.Query(
        ContainsValue(
            7,
            Obj(
                "a", 1,
                "b", 2,
                "c", 3
            )
        )
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

BooleanV(False)

System.out.println(
    client.query(
        ContainsValue(
            Value(7),
            Obj(
                "a", Value(1),
                "b", Value(2),
                "c", Value(3)
            )
        )
    )
    .get());

false

ContainsValue(
  7,
  {
    'a': 1,
    'b': 2,
    'c': 3,
  },
)

false

Query metrics:

bytesIn: 56
bytesOut: 18
computeOps: 1
readOps: 0
writeOps: 0
readBytes: 0
writeBytes: 0
queryTime: 2ms
retries: 0

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