Checking if key exists in cache

This API request checks if an object exists in cache. If object is present in cache, the method returns true, otherwise - false.

Objective-CSwift

- (void)containsWithKey:(NSString * _Nonnull)key responseHandler:^(BOOL)responseHandler errorHandler:^(Fault * _Nonnull)errorHandler;

func contains(key: String, responseHandler: ((Bool) -> Void)!, errorHandler: ((Fault) -> Void)!)

where:

Argument	Description
key	identifies the object to check in cache.

Example

Objective-CSwift

[Backendless.shared.cache containsWithKey:@"CacheWeather" responseHandler:^(BOOL contains) {
    if (contains) {
        NSLog(@"Object exists in cache");
    }
    else {
        NSLog(@"Object doesn't exist in cache");
    }
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

Backendless.shared.cache.contains(key: "CacheWeather", responseHandler: { contains in
    if contains {
        print("Object exists in cache")
    }
    else {
        print("Object doesn't exist in cache")
    }
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

Codeless Reference

where:

Argument	Description
key name	Key assigned to the object to identify it in cache. The key is used to check if the cache still contains the object.

Returns true if the key still exists in cache, otherwise returns false.

Consider the following key-value pair stored in cache:

The example below checks if the key "orderName" is still stored in cache.

The operation returns true, indicating that the "orderName" key still exists in cache.