How to use NSpredicate on array of nested dictionaries - ios

Question

Array format:
{
"sku": "NikeL101Black",
"name": "Nike Black shirt -L",
"attribute_set_id": 4,
"price": 30,
"status": 1,
"visibility": 1,
"type_id": "simple",
"created_at": "2015-12-01 23:02:07",
"updated_at": "2015-12-01 23:02:23",
"weight": 2,
"product_links": [],
"options": [],
"tier_prices": [],
"custom_attributes": [
{
"attribute_code": "swatch_image",
"value": "/m/i/miler-uv-mens-t-shirt-black-p7394-6131_zoom_1_1.jpg"
},
{
"attribute_code": "tax_class_id",
"value": "2"
},
{
"attribute_code": "image",
"value": "/m/i/miler-uv-mens-t-shirt-black-p7394-6131_zoom_1_1.jpg"
},
{
"attribute_code": "category_ids",
"value": [
"3"
]
},
{
"attribute_code": "description",
"value": "<p>Cool black nike tshirt</p>"
},
{
"attribute_code": "color",
"value": "7"
},
{
"attribute_code": "required_options",
"value": "0"
},
{
"attribute_code": "size",
"value": "14"
},
{
"attribute_code": "has_options",
"value": "0"
},
{
"attribute_code": "vendor",
"value": "Paxcel Cloth House"
},
{
"attribute_code": "small_image",
"value": "/m/i/miler-uv-mens-t-shirt-black-p7394-6131_zoom_1_1.jpg"
},
{
"attribute_code": "thumbnail",
"value": "/m/i/miler-uv-mens-t-shirt-black-p7394-6131_zoom_1_1.jpg"
},
{
"attribute_code": "url_key",
"value": "nike-red-shirt-s-7"
},
{
"attribute_code": "meta_title",
"value": "Nike Red shirt -S"
},
{
"attribute_code": "meta_keyword",
"value": "Nike Red shirt -S"
},
{
"attribute_code": "meta_description",
"value": "Nike Red shirt -S <p>Cool red noke tshirt</p>"
},
{
"attribute_code": "options_container",
"value": "container2"
}
]
},
How to filter an array of above type dictionaries by (attribute_code = color and value = 7) AND (attribute_code = size and value = 12)
I tried with a compound predicate:
NSPredicate *filterChildrenBySize = [NSPredicate predicateWithFormat:#"ANY custom_attributes.attribute_code == size AND custom_attributes.value.integerValue == %#", [[attributes objectForKey:#"sizeInfo"] objectForKey:kAttributeCodeSize]];
Predicate looks like this --> ANY custom_attributes.attribute_code == color AND custom_attributes.value.integerValue == 4

Answer 1

You have to do like this. Check the NSLog of filterArray.
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingAllowFragments error:nil];
NSLog(#"OUTPUT DATA: %#" ,jsonDict);
NSArray *arrayList = [jsonDict objectForKey:#"custom_attributes"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"self.attribute_code == 'color' AND self.value == '7'"];
NSArray *filterArray = [arrayList filteredArrayUsingPredicate:predicate];
NSLog(#"FILTERED DATA: %#" ,filterArray);
Here 'jsonString' is the String what you provided. I just did the NSJSONSerialization to convert the Stirng into NSDictionary.

Answer 2

You have to merge both filters with OR instead of AND. It will never compare with AND in your case and will return 0 objects as filteredArray
Here is a compound predicate for your custom_attributes array.
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"(attribute_code ==[c] 'color' AND value == '7') OR (attribute_code ==[c] 'size' AND value == '12')"];
// Assuming that you have parsed you custom_attributes object to customAtrributes
NSArray *filteredArray = [customAtrributes filteredArrayUsingPredicate:predicate];

Answer 3

Try to use ANY for that.
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"custom_attributes.value == %d", 7];
NSArray *filterArray = [yourArray filteredArrayUsingPredicate:predicate];
NSPredicate *predicate1 = [NSPredicate predicateWithFormat:#"custom_attributes.attribute_code CONTAINS[c] %#", "color"];
NSArray *filterArray1 = [filterArray filteredArrayUsingPredicate:predicate1];