我有一个扁平的JSON文件，如下所示：
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.bottomappbar.BottomAppBar
android:id="@+id/bottom_app_bar"
style="@style/Widget.MaterialComponents.BottomAppBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:backgroundTint="@color/colorGray"
app:fabAlignmentMode="center" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_gravity="bottom"
android:background="#80FFFFFF"
android:icon="@drawable/bottom_nav_ic_assignment"
app:itemIconTint="@color/bottom_nav_item_color"
app:itemTextColor="@color/bottom_nav_item_color"
app:labelVisibilityMode="selected"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/bottom_nav_menu" />
</FrameLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/addFab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="true"
android:onClick="onFabClicked"
android:src="@drawable/ic_add_white"
app:backgroundTint="@color/colorBlue"
app:fabSize="auto"
app:layout_anchor="@+id/bottom_app_bar"
app:layout_anchorGravity="center|top" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
我需要按页码，按页面版本，按PtrChild，按分配对数据进行分组，以便在完成后看起来像这样：
{"dataSet": {"dataTable": [{
"id": "List1",
"row": [
{
"pagenumber": "7",
"pageversion": "HE; K12",
"category": "3D Print - K12;HE",
"pagetype": "Product",
"PtrChild": "MakerBot - 10771",
"Allocation": "0.500",
"catext": "Text goes here"
},
{
"pagenumber": "7",
"pageversion": "SL",
"category": "3D Print - SL",
"pagetype": "Product",
"PtrChild": "AUTODESK - 10032",
"Allocation": "0.500",
"catext": "Text goes here"
},
{
"pagenumber": "10",
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Brand",
"PtrChild": null,
"Allocation": "1.000",
"catext": "Text goes here"
},
{
"pagenumber": "11",
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Product",
"PtrChild": "EPSON INK JET** - 10082",
"Allocation": "0.200",
"catext": "Text goes here"
},
{
"pagenumber": "11",
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Product",
"PtrChild": "EPSON INK JET** - 10082",
"Allocation": "0.200",
"catext": "Text goes here"
},
{
"pagenumber": "11",
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Product",
"PtrChild": "EPSON INK JET** - 10082",
"Allocation": "0.500",
"catext": "Text goes here"
},
{
"pagenumber": "11",
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Product",
"PtrChild": "LEXMARK** - 10151",
"Allocation": "0.200",
"catext": "Text goes here"
}
]
}]}}
运行此：
{"pages": [
{
"pagenumber": "7",
"versions": [
{
"pageversion": "HE; K12",
"category": "3D Print - K12;HE",
"pagetype": "Product",
"partners": [{
"PtrChild": "MakerBot - 10771",
"allocations": [{
"Allocation": "0.500",
"ads": [{"catext": "Text goes here"}]
}]
}]
},
{
"pageversion": "SL",
"category": "3D Print - SL",
"pagetype": "Product",
"partners": [{
"PtrChild": "AUTODESK - 10032",
"allocations": [{
"Allocation": "0.500",
"ads": [{"catext": "Text goes here"}]
}]
}]
}
]
},
{
"pagenumber": "10",
"versions": [{
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Brand",
"partners": [{
"PtrChild": null,
"allocations": [{
"Allocation": "1.500",
"ads": [{"catext": "Text goes here"}]
}]
}]
}]
},
{
"pagenumber": "11",
"versions": [{
"pageversion": "Apply to All",
"category": "Secure Printers",
"pagetype": "Product",
"partners": [
{
"PtrChild": "EPSON INK JET** - 10082",
"allocations": [
{
"Allocation": "0.250",
"ads": [
{"catext": "Text goes here"},
{"catext": "Text goes here"}
]
},
{
"Allocation": "0.500",
"ads": [{"catext": "Text goes here"}]
}
]
},
{
"PtrChild": "LEXMARK** - 10151",
"allocations": [{
"Allocation": "0.200",
"ads": [{"catext": "Text goes here"}]
}]
}
]
}]
}
]}
...获得正确的分组，但消除了每个组的键：
var myGroupedData = nest(myCatalog, ["pagenumber", "pageversion", "PtrChild", "Allocation"]);
// Reorganize JSON data
function nest(collection, keys) {
if (!keys.length) {
return collection;
}
else {
return _(collection).groupBy(keys[0]).mapValues(function(values) {
return nest(values, keys.slice(1));
}).value();
}
}
如何保留键并在多个键上分组？
我被迫使用ExtendScript，因此不能使用3.10.1版以后的Lodash。
答案 0 :(得分：2)
您可以为每个级别的期望属性获取一个辅助数组，为不同名称的children数组获取一个最后一项，并为对象提取使用过的属性以获取最终清理的对象的方法。
var data = { dataSet: { dataTable: [{ id: "List1", row: [{ pagenumber: "7", pageversion: "HE; K12", category: "3D Print - K12;HE", pagetype: "Product", PtrChild: "MakerBot - 10771", Allocation: "0.500", catext: "Text goes here" }, { pagenumber: "7", pageversion: "SL", category: "3D Print - SL", pagetype: "Product", PtrChild: "AUTODESK - 10032", Allocation: "0.500", catext: "Text goes here" }, { pagenumber: "10", pageversion: "Apply to All", category: "Secure Printers", pagetype: "Brand", PtrChild: null, Allocation: "1.000", catext: "Text goes here" }, { pagenumber: "11", pageversion: "Apply to All", category: "Secure Printers", pagetype: "Product", PtrChild: "EPSON INK JET** - 10082", Allocation: "0.200", catext: "Text goes here" }, { pagenumber: "11", pageversion: "Apply to All", category: "Secure Printers", pagetype: "Product", PtrChild: "EPSON INK JET** - 10082", Allocation: "0.200", catext: "Text goes here" }, { pagenumber: "11", pageversion: "Apply to All", category: "Secure Printers", pagetype: "Product", PtrChild: "EPSON INK JET** - 10082", Allocation: "0.500", catext: "Text goes here" }, { pagenumber: "11", pageversion: "Apply to All", category: "Secure Printers", pagetype: "Product", PtrChild: "LEXMARK** - 10151", Allocation: "0.200", catext: "Text goes here" }] }] } },
props = [["pagenumber", "versions"], ["pageversion", "category", "pagetype", "partners"], ["PtrChild", "allocations"], ["Allocation", "ads"]],
result = data.dataSet.dataTable.reduce((r, { row }) => {
row.forEach(o => props.reduce((a, [...keys]) => {
var children = keys.pop(),
temp = a.find(p => p[keys[0]] === o[keys[0]]);
if (!temp) a.push(temp = Object.assign(...keys.map(k => ({ [k]: o[k] })), { [children]: [] }));
o = keys.reduce((p, k) => ({ [k]: k, ...p } = p, p), o);
return temp[children];
}, r).push(o));
return r;
}, []);
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }
答案 1 :(得分：0)
此解决方案适用于ES5和lodash 3.10.1。它基于Nina Scholz's answer中的道具思想。
但是，这里的想法不是从最终对象中删除属性，而是让每个级别在组之后选择其自己的属性，如果是最后一个级别，请避免进行分组，并从这些属性创建一个数组。
function nest(collection, props) {
var currentProps = _.first(props);
var restProps = _.rest(props);
if(_.size(props) === 1) {
return _.map(collection, _.partialRight(_.pick, currentProps));
}
return _(collection)
.groupBy(_.first(currentProps))
.map(function(values) {
var item = _.first(values);
var fields = _.pick(item, _.initial(currentProps));
var collectionKey = _.last(currentProps);
fields[collectionKey] = nest(values, restProps);
return fields;
})
.value();
}
var myCatalog = {"dataSet":{"dataTable":[{"id":"List1","row":[{"pagenumber":"7","pageversion":"HE; K12","category":"3D Print - K12;HE","pagetype":"Product","PtrChild":"MakerBot - 10771","Allocation":"0.500","catext":"Text goes here"},{"pagenumber":"7","pageversion":"SL","category":"3D Print - SL","pagetype":"Product","PtrChild":"AUTODESK - 10032","Allocation":"0.500","catext":"Text goes here"},{"pagenumber":"10","pageversion":"Apply to All","category":"Secure Printers","pagetype":"Brand","PtrChild":null,"Allocation":"1.000","catext":"Text goes here"},{"pagenumber":"11","pageversion":"Apply to All","category":"Secure Printers","pagetype":"Product","PtrChild":"EPSON INK JET** - 10082","Allocation":"0.200","catext":"Text goes here"},{"pagenumber":"11","pageversion":"Apply to All","category":"Secure Printers","pagetype":"Product","PtrChild":"EPSON INK JET** - 10082","Allocation":"0.200","catext":"Text goes here"},{"pagenumber":"11","pageversion":"Apply to All","category":"Secure Printers","pagetype":"Product","PtrChild":"EPSON INK JET** - 10082","Allocation":"0.500","catext":"Text goes here"},{"pagenumber":"11","pageversion":"Apply to All","category":"Secure Printers","pagetype":"Product","PtrChild":"LEXMARK** - 10151","Allocation":"0.200","catext":"Text goes here"}]}]}};
var props = [["pagenumber", "versions"], ["pageversion", "category", "pagetype", "partners"], ["PtrChild", "allocations"], ["Allocation", "ads"], ["catext"]];
var myGroupedData = nest(_.flatten(_.map(myCatalog.dataSet.dataTable, 'row')), props);
console.log(myGroupedData);<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.js"></script>