Check If Exists¶

Description¶

This operation verifies if a specific key exists in the specified map.

Method¶

Objective-CSwift

[[[Backendless.shared hive:(NSString *)hiveName] mapStore:(NSString *)keyName] keyExistsWithKey:(NSString *)key responseHandler:^(BOOL)responseHandler errorHandler:^(Fault *)errorHandler];

Backendless.shared.hive(hiveName: String).mapStore(keyName: String).keyExists(key: String, responseHandler: ((Bool) -> Void)!, errorHandler: ((Fault) -> Void)!)

where:

Argument	Description
`hiveName`	Name of a hive where the operation is performed. String value.
`keyName`	Key name identifying a map. String value.
`key`	Key name identifying a key-value pair to check if it exists. String value.

Return Value¶

true if an object exists. Otherwise, returns false.

Example¶

The example below checks if the "Oranges" key exists in the "fruits" map.

Objective-CSwift

[[[Backendless.shared hive:@"groceryStore"] mapStore:@"fruits"] keyExistsWithKey:@"Oranges" responseHandler:^(BOOL response) {
    // handle response
} errorHandler:^(Fault *fault) {
    // handle error
}];

Backendless.shared.hive("groceryStore").mapStore("fruits").keyExists(key: "Oranges", responseHandler: { response in
    // handle response
}, errorHandler: { fault in
    // handle error
})

where:

Argument	Description
`"groceryStore"`	Name of a hive where the operation is performed.
`"fruits"`	Key name identifying a map.

Codeless Reference
¶

where:

Argument	Description
`hive name`	Name of a hive where the operation is performed.
`key name`	Key name identifying a map.
`object key name`	Key name identifying a key-value pair.