Can't create YapDatabaseQuery in Swift

[jj0b]

I'm struggling to create a query in Swift and I'm not sure if this is due to a bug or a lack of understanding of how to create a query.

I've added the YapDatabase extension detailed in the YapDatabaseQuery header and I've tried:

var query: YapDatabaseQuery = YapDatabaseQuery(format: "WHERE authToken IS NOT NULL", arguments:nil)

this gives the error:

Cannot find an initializer for type 'YapDatabaseQuery' that accepts an argument list of type '(format: String, arguments: nil)'

I assumed this was because arguments need to be Objective-C types according to the header, so I then tried this:

var query: YapDatabaseQuery = YapDatabaseQuery(format: "WHERE authToken ?", arguments:NSString(string: "IS NOT NULL"))

But I still get an error even with passing an NSString:

Cannot find an initializer for type 'YapDatabaseQuery' that accepts an argument list of type '(format: String, arguments: NSString)'

[jeremiegirault]

Yes variable arguments list functions in objc are not available in swift
I made a small wrapper using objc bridging :

@interface YapDatabaseQuery (Swift)

+(instancetype)queryWithFormatSimple:(NSString*)format;
+(instancetype)queryWithFormat:(NSString*)format arg1:(id)arg;

@end

@implementation YapDatabaseQuery (Swift)

+(instancetype)queryWithFormatSimple:(NSString*)format {
    return [self queryWithFormat:format];
}

+(instancetype)queryWithFormat:(NSString*)format arg1:(id)arg {
    return [self queryWithFormat:format, arg];
}

@end

You can add as many arguments as you want.

A function with an NSArray argument list would be convenient for people using swift

[jj0b]

Thanks, I'll give this a try.

Looking at YapDatabaseQuery, it looks like we could also just expose this existing method in the header:

- (id)initWithQueryString:(NSString *)inQueryString queryParameters:(NSArray *)inQueryParameters;

[jj0b]

Thanks @jeremiegirault your solution worked perfectly.

[maelp]

Here is another way :)

var arguments: [CVarArgType] = [x, y, a, b].map({NSNumber(double: $0)}) // must be var to get a pointer, must be a NSObject to be formatted
let queryString = "WHERE \"x\" >= ? AND \"y\" <= ? AND \"a\" >= ? AND \"b\" <= ?"
let query = withVaList(arguments, { (pointer: CVaListPointer) -> YapDatabaseQuery in
    return YapDatabaseQuery(format: queryString, arguments: pointer)
})

[robbiehanson]

I refactored the internals of YapDatabaseQuery in order to expose this method for Swift :

/**
 * Alternative initializer - generally preferred for Swift code.
**/
+ (instancetype)queryWithString:(NSString *)queryString parameters:(NSArray *)queryParameters;