遍历dart对象以将子列表的字段与另一个列表id的字段进行比较

Question

我的产品列表包含类别ID，我需要在新列表中获得相同类别的所有产品

我在Flutter中为两个API都进行了建模，效果很好，我需要遍历产品以使所有产品都属于我使用过的redux类别的选定ID

如何将类别ID与产品中的字段类别进行比较

产品

 "results": [
        {
            "id": 2,
            "name": "Lactoni sport",
            "name_ar": "",
            "description": "Lactoni sport",
            "description_ar": "",
            "images": [
                {
                    "id": 1,
                    "product": "http://192.168.2.3:8000/api/products/2/",
                    "thumbnail": "http://192.168.2.3:8000/media/product-thumbnails/a3logo.png"
                }
            ],
            "price": "333.00",
            "weight": "",
            "offer": "",
            "categories": [
                1
            ],
            "sub_categories": [],
            "supplier": []
        },
        {
            "id": 3,
            "name": "Nike",
            "name_ar": "",
            "description": "nike shoes",
            "description_ar": "",
            "images": [
                {
                    "id": 2,
                    "product": "http://192.168.2.3:8000/api/products/3/",
                    "thumbnail": "http://192.168.2.3:8000/media/product-thumbnails/18-420_Nike_Paul_George_3_Heroes_04_Surface-02_rectangle_1600_GAiQk1O.jpg"
                }
            ],
            "price": "45.00",
            "weight": "",
            "offer": "",
            "categories": [
                1
            ],
            "sub_categories": [],
            "supplier": []
        },
]

类别

"results": [
        {
            "id": 1,
            "category": "sport",
            "category_ar": "sport",
            "image": "http://192.168.2.3:8000/media/category-images/A31.png",
            "sequence": 1
        },
        {
            "id": 2,
            "category": "meat",
            "category_ar": "meat",
            "image": "http://192.168.2.3:8000/media/category-images/IntlMeatCo-217_1-Bone-In-Ribeye.jpg",
            "sequence": 3
        },
        {
            "id": 3,
            "category": "Milk",
            "category_ar": "milk",
            "image": "http://192.168.2.3:8000/media/category-images/images.jpeg",
            "sequence": 4
        },
]```