demo.rb

require "hashie"

jeans = {
    "productHeader": {
        "totalHits": 367
    },
    "products": [{
        "name": "501 CT Jeans For Women",
        "productImage": {
            "url": "http://nlyscandinavia.scene7.com/is/image/nlyscandinavia/productLarge/441576-1056.jpg"
        },
        "language": "no",
        "description": "Jeans fra Levi's. Noe kortere nederst, fem lommer. Normal høyde på midjen, med hemper i linningen og knappegylfen. Dekorative slitte partier foran og nederst på benet.<br />Laget av 100% bomull.",
        "brand": "Levis",
        "identifiers": {
            "sku": "441576-1056"
        },
        "fields": [{
            "name": "sale",
            "value": "false"
        }, {
            "name": "sizes",
            "value": "W24/L32,W25/L32,W26/L32,W27/L32,W28/L32,W29/L32,W30/L32,W31/L32,W25/L34,W26/L34,W27/L34,W28/L34,W29/L34,W30/L34"
        }, {
            "name": "productStyle",
            "value": "Straight"
        }, {
            "name": "gender",
            "value": "Kvinne"
        }, {
            "name": "product_id_original",
            "value": "441576-1056"
        }, {
            "name": "productGroup",
            "value": "Jeans"
        }, {
            "name": "extraImageProductLarge",
            "value": "http://nlyscandinavia.scene7.com/is/image/nlyscandinavia/productLarge/441576-1056.jpg"
        }, {
            "name": "extraImageProductSmall",
            "value": "http://nlyscandinavia.scene7.com/is/image/nlyscandinavia/cart_thumb/441576-1056.jpg"
        }, {
            "name": "artNumber",
            "value": "441576-1056"
        }, {
            "name": "productClass",
            "value": "Klær"
        }, {
            "name": "color",
            "value": "Indigo"
        }],
        "offers": [{
            "feedId": 10086,
            "productUrl": "http://pdt.tradedoubler.com/click?a(2402331)p(80279)product(57d37b9ce4b085c06c38c96b)ttid(3)url(http%3A%2F%2Fnelly.com%2Fno%2Fkl%C3%A6r-til-kvinner%2Fkl%C3%A6r%2Fjeans%2Flevis-441%2F501-ct-jeans-for-women-441576-1056%2F)",
            "priceHistory": [{
                "price": {
                    "value": "1195",
                    "currency": "NOK"
                },
                "date": 1473477532181
            }],
            "modified": 1473477532181,
            "inStock": 1,
            "sourceProductId": "441576-1056",
            "programLogo": "http://hst.tradedoubler.com/file/17833/2014-logos/200X200.png",
            "programName": "Nelly NO",
            "id": "57d37b9ce4b085c06c38c96b"
        }],
        "categories": [{
            "name": "Kvinne > KLÆR > Jeans > Straight"
        }]
    }]
}

jeans.extend Hashie::Extensions::DeepFetch

fields = jeaos.deep_fetch :products, 0, :fields
# =>
#[{:name=>"sale", :value=>"false"},
# {:name=>"sizes", :value=>"W24/L32,W25/L32,W26/L32,W27/L32,W28/L32,W29/L32,W30/L32,W31/L32,W25/L34,W26/L34,W27/L34,W28/L34,W29/L34,W30/L34"},
# {:name=>"productStyle", :value=>"Straight"},
# {:name=>"gender", :value=>"Kvinne"},
# {:name=>"product_id_original", :value=>"441576-1056"},
# {:name=>"productGroup", :value=>"Jeans"},
# {:name=>"extraImageProductLarge", :value=>"http://nlyscandinavia.scene7.com/is/image/nlyscandinavia/productLarge/441576-1056.jpg"},
# {:name=>"extraImageProductSmall", :value=>"http://nlyscandinavia.scene7.com/is/image/nlyscandinavia/cart_thumb/441576-1056.jpg"},
# {:name=>"artNumber", :value=>"441576-1056"},
# {:name=>"productClass", :value=>"Klær"},
# {:name=>"color", :value=>"Indigo"}]

fields.find { |field| field[:name] == "productGroup" }
# => {:name=>"productGroup", :value=>"Jeans"}