How to access data "deep" inside a NSDictionary? - objective-c

Question

I am getting a JSON response from a web service as follows into a NSDictionary
NSDictionary *fetchAllCollectionsJSONResponse = [NSJSONSerialization JSONObjectWithData:data
options:0
error:NULL];
If I dump the output of the NSDictionary it looks correct like this
2017-10-06 10:11:46.097698+0800 NWMobileTill[396:33294] +[ShopifyWebServices fetchAllCollections]_block_invoke, {
data = {
shop = {
collections = {
edges = (
{
cursor = "eyJsYXN0X2lkIjo0NTI4NTY3MTcsImxhc3RfdmFsdWUiOiI0NTI4NTY3MTcifQ==";
node = {
description = "";
id = "Z2lkOi8vc2hvcGlmeS9Db2xsZWN0aW9uLzQ1Mjg1NjcxNw==";
};
},
{
cursor = "eyJsYXN0X2lkIjo0NTI4NTkwODUsImxhc3RfdmFsdWUiOiI0NTI4NTkwODUifQ==";
node = {
description = "Test Collection 1";
id = "Z2lkOi8vc2hvcGlmeS9Db2xsZWN0aW9uLzQ1Mjg1OTA4NQ==";
};
},
{
cursor = "eyJsYXN0X2lkIjo0NTU0OTMwMDUsImxhc3RfdmFsdWUiOiI0NTU0OTMwMDUifQ==";
node = {
description = Sovrum;
id = "Z2lkOi8vc2hvcGlmeS9Db2xsZWN0aW9uLzQ1NTQ5MzAwNQ==";
};
},
{
cursor = "eyJsYXN0X2lkIjo0NTU0OTMzODksImxhc3RfdmFsdWUiOiI0NTU0OTMzODkifQ==";
node = {
description = Badrum;
id = "Z2lkOi8vc2hvcGlmeS9Db2xsZWN0aW9uLzQ1NTQ5MzM4OQ==";
};
}
);
pageInfo = {
hasNextPage = 0;
};
};
};
};
}
I need to access the "description" attribute deep inside this structure and I cannot figure out how to do it.
I tried the following but it crashes
for (NSDictionary *dictionary in fetchAllCollectionsJSONResponse) {
NSLog(#"jongel %#", [dictionary objectForKey:#"data"]);
}

Answer 1

#Bilal's answer is right. This might be a bit easier to read:
NSArray *edges = fetchAllCollectionsJSONResponse[#"data"][#"shop"][#"collections"][#"edges"];
for (NSDictionary *edge in edges) {
NSString *description = edge[#"node"][#"description"];
NSLog(#"description = %#", description);
}

Answer 2

fetchAllCollectionsJSONResponse is a Dictionary not an Array. Try this.
NSDictionary *fetchAllCollectionsJSONResponse = nil;
NSDictionary *data = fetchAllCollectionsJSONResponse[#"data"];
NSDictionary *shop = fetchAllCollectionsJSONResponse[#"shop"];
NSDictionary *collections = fetchAllCollectionsJSONResponse[#"collections"];
NSArray *edges = fetchAllCollectionsJSONResponse[#"edges"];
// Or a shorter version
// NSArray *edges = fetchAllCollectionsJSONResponse[#"data"][#"shop"][#"collections"][#"edges"];
for (NSDictionary *edge in edges) {
NSString *cursor = edge[#"cursor"];
NSDictionary *node = edge[#"node"];
}