JSON with Dictionary - nested objects to convert to strings and display - ios

Question

I came across few posts here related to what I am doing but I am working with some nested objects that I want to extract.
This is a sample of my returned data - https://gist.github.com/ryancoughlin/8043604
I have this in my header so far :
#import "TideModel.h"
#protocol TideModel
#end
#implementation TideModel
-(id)initWithDict:(NSDictionary *)json {
self = [super init];
if(self) {
self.maxheight = [dictionary valueForKeyPath:#"tide.tideSummaryStats.minheight"];
self.minheight = [dictionary valueForKeyPath:#"tide.tideSummaryStats.maxheight"];
self.tideSite = [dictionary valueForKeyPath:#"tide.tideInfo.tideSite"];
}
return self;
}
#end
I have declared a property for each string and i am accessing it accordingly.
But what I have above doesn't work, maybe because it wont know what to drill in to correct?... Or will it?

Answer 1

tide.tideSummaryStats returns an array.
tide.tideInfo returns an array.
So you can't do -valueForKeyPath: all the way.
Also, this is incorrect: [dictionary valueForKeyPath:...];
it should be : [json valueForKeyPath:...];
because json is the name of the NSDictionary variable passed (not dictionary)
Try this (not sure):
-(id)initWithDict:(NSDictionary *)json {
self = [super init];
if(self) {
NSArray *arrOfTideSummaryStats = [json valueForKeyPath:#"tide.tideSummaryStats"];
NSDictionary *dctOfTideSummaryStats = [arrOfTideSummaryStats objectAtIndex:0];
//since self.maxheight and self.minheight are NSString objects and
//the original keys "minheight" & "maxheight" return float values, do:
self.maxheight = [NSString stringWithFormat:#"%f", [dctOfTideSummaryStats valueForKey: #"maxheight"]];
self.minheight = [NSString stringWithFormat:#"%f", [dctOfTideSummaryStats valueForKey: #"minheight"]];
/*============================================================*/
NSArray *arrOfTideInfo = [json valueForKeyPath:#"tide.tideInfo"];
NSDictionary *dctOfTideInfo = [arrOfTideInfo objectAtIndex:0];
self.tideSite = [dctOfTideInfo valueForKey:#"tideSite"];
}
return self;
}
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How to parsing JSON object in iPhone SDK (XCode) using JSON-Framework
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Keypath for first element in embedded NSArray

Answer 2

Recently had to create a app that worked with a remote RESTful server that returned JSON data and was then deserialised into an object for graphing.
I used unirest for the requests and responses and then deserialised the returned JSON into an object. Below is an extract of the code where "hourlySalesFigures" within dictionary "jsonResponseAsDictionary" was a JSON collection of 24 figures which I put into an array. Please note the function is a lot larger but I removed anything which I thought was distracting.
- (PBSSales*) deserializeJsonPacket2:(NSDictionary*)jsonResponseAsDictionary withCalenderType:(NSString *)calendarViewType
{
PBSSales *pbsData = [[PBSSales alloc] init];
if(jsonResponseAsDictionary != nil)
{
// Process the hourly sales figures if the day request and returned is related to Daily figures
if([calendarViewType isEqualToString:#"Day"]){
NSArray *hourlyFiguresFromJson = [jsonResponseAsDictionary objectForKey:#"hourlySalesFigures"];
PBSDataDaySales *tmpDataDay = [[PBSDataDaySales alloc] init];
NSMutableArray *hSalesFigures = [tmpDataDay hourlySalesFigures];
for(NSInteger i = 0; i < [hourlyFiguresFromJson count]; i++){
hSalesFigures[i] = hourlyFiguresFromJson[i];
}
[[pbsData dataDay] setHourlySalesFigures:hSalesFigures];
[pbsData setCalViewType:#"Day"];
}
}
return pbsData;
}