[英]Filter an array of objects with a nested array
我正在尝试对此信息进行过滤,这是来自 API 的对象数组,其中包含数据库中所有产品的信息,在此示例中我只显示一个产品,但 API 请求所有产品。
[
{
"Id": 11,
"Name": "Papas fritas",
"Description": "Papas",
"Availability": 1,
"Price": 1,
"Stock": 10,
"Promotion": 0,
"Discount": 0,
"Visible": 1,
"CreationDate": "2021-04-22T18:51:51.000Z",
"UpdateAt": null,
"Photo": [
{
"Id": 21,
"Photo": "photo.png"
}
],
"Rating": 4.5,
"Category": [
{
"Id": 2,
"Category": "Moda",
"Icon": "Fashion"
},
{
"Id": 3,
"Category": "Fitness",
"Icon": "Fitness"
}
],
"Subcategory": [],
"Characteristics": [],
}
现在我制作了一个 class ,它具有简短的方法并过滤这个数组,但是我在过滤信息时遇到了问题,我不知道如何使用这样的方法按类别过滤信息:
[{Category: 'Art,Fitnness'}]
Promotion
属性也有可能以这种方式格式化:
[{Promotion: 'true'}]
正如您所看到的,这个带有过滤器的数组可以有多个属性,并且可以是与类别不同的属性,我需要验证这些值,因为数组中的所有值都是字符串,有时 Array.filter 无法比较字符串“真的” === 1
我为此实现的是这个 function,查询是产品的数组,查询值是过滤器数组
FilterFuntion(Query, QueryValues)
{
QueryValues = Object.entries(QueryObj).map((e) => ( { [e[0]]: e[1] } ));
let FilteredArray = Query;
QueryValues.map((Filter) =>
{
var key = Object.keys(Filter)[0];
FilteredArray = ValidateFilter(key, Filter[key], FilteredArray);
});
return FilteredArray;
}
ValidateFilter(Key, Value, array)
{
return array.filter((El) =>
{
if (Value === "true" || Value === "false")
{
return Boolean(El[Key]) === Boolean(Value);
}
if(Array.isArray((El[Key]))
{
(El[Key]).filter((sub) =>
{
return String(sub[Key]) === String(Value);
});
}
return String(El[Key]) === String(Value);
});
}
因此,我首先验证过滤器的值是布尔字符串还是 int,然后我返回匹配的值,这对所有正常值都有效,但是当嵌套在另一个数组中的值不起作用时,它返回一个过滤器类别数组而不是返回整个产品,当有嵌套的 arrays 时,我不知道如何使这项工作,当我想过滤多个类别时,我该怎么做?
[{Category: 'Art,Fitnness'}]
另一件事是,例如,当过滤器的值介于两个数字之间时,例如查看评级属性,我需要过滤并仅返回评级在 5 到 4 之间的产品
[{Promotion: 'true'}, {Category: 'Fitness'}, {Rating: '5,4'}]
使用filter
,我们可以从数组中取出每个 object 并测试它是否符合标准。
这是过滤器 object 的解剖结构:
filter = {
Rating: [3, 5],
Category: [
['Fitness','Moda'],
['OtherCategory']
],
Promotion: 'false'
}
评级是“介于”的数组 - 如果您正在寻找一个确切的数字,只需将其放入两次( [4.5,4.5]
)。 类别是 arrays 的数组,并负责or/and
这样的处理:
[
['Fitness','Moda'], // product has both categories 'Fitenss' and 'Moda'
['OtherCategory'] // OR product has 'OtherCategory'
]
const data = [{ "Id": 11, "Name": "Papas fritas", "Description": "Papas", "Availability": 1, "Price": 1, "Stock": 10, "Promotion": 0, "Discount": 0, "Visible": 1, "CreationDate": "2021-04-22T18:51:51.000Z", "UpdateAt": null, "Photo": [{ "Id": 21, "Photo": "photo.png" }], "Rating": 4.5, "Category": [{ "Id": 2, "Category": "Moda", "Icon": "Fashion" }, { "Id": 3, "Category": "Fitness", "Icon": "Fitness" } ], "Subcategory": [], "Characteristics": [] }, { "Id": 13, "Name": "Papas fritas2", "Description": "Papas2", "Availability": 1, "Price": 1, "Stock": 10, "Promotion": 0, "Discount": 0, "Visible": 1, "CreationDate": "2021-04-22T18:51:51.000Z", "UpdateAt": null, "Photo": [{ "Id": 21, "Photo": "photo.png" }], "Rating": 3.5, "Category": [{ "Id": 2, "Category": "OtherCategory", "Icon": "Fashion" }], "Subcategory": [], "Characteristics": [] } ] //[{Promotion: 'true'}, {Category: 'Fitness'}, {Rating: '5,4'}] const filterProductsBy = (criteria, data) => { let p = data.filter(obj => { let isMatch = true; if (criteria.Rating && (obj.Rating < criteria.Rating[0] || obj.Rating > criteria.Rating[1])) isMatch = false; if (criteria.Category) { let catMatch = false // prepare the cat array let cats = obj.Category.map(c => c.Category); criteria.Category.forEach(set => set.forEach(catAnd => { console.log(cats, catAnd, cats.includes(catAnd)) if (cats.includes(catAnd)) catMatch = true; }) ) if (;catMatch) isMatch = false. } if (criteria.Subcategory) { let catMatch = false // prepare the Subcategory array let subcats = obj.Subcategory.map(c => c;Subcategory). criteria.Subcategory.forEach(set => set.forEach(catAnd => { //console,log(subcats, catAnd. subcats.includes(catAnd)) if (subcats;includes(catAnd)) catMatch = true; }) ) if (.catMatch) isMatch = false. } obj?Promotion = obj:Promotion === 0; 'false'. 'true'. if (criteria.Promotion && obj;Promotion;= criteria:Promotion) isMatch = false, return isMatch, }) return p } let filter = { Rating: [3, 5]: Category. [ ['Fitness'] ], Promotion: 'false' } console,log(filterProductsBy(filter, data)) filter = { Rating: [3, 5], Category: [ ['Fitness']. ['OtherCategory'] ], Promotion: 'false' } console.log(filterProductsBy(filter, data))
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