MongoDB聚合式分面搜索
以集合为例,如下所示:MongoDB聚合式分面搜索,mongodb,facet,faceted-search,Mongodb,Facet,Faceted Search,以集合为例,如下所示: db.products.insert([ {"product_name": "Product 1", "filters": [{"name": "brand", "value": "Brand 1"}, {"name": "color", "value": "Color 1"}]}, {"product_name": "Product 2", "filters": [{"name": "brand", "value": "Brand 2"}, {"name
db.products.insert([
{"product_name": "Product 1", "filters": [{"name": "brand", "value": "Brand 1"}, {"name": "color", "value": "Color 1"}]},
{"product_name": "Product 2", "filters": [{"name": "brand", "value": "Brand 2"}, {"name": "color", "value": "Color 2"}]},
{"product_name": "Product 3", "filters": [{"name": "brand", "value": "Brand 1"}, {"name": "color", "value": "Color 2"}]},
{"product_name": "Product 4", "filters": [{"name": "brand", "value": "Brand 3"}, {"name": "color", "value": "Color 1"}]},
{"product_name": "Product 5", "filters": [{"name": "brand", "value": "Brand 3"}, {"name": "color", "value": "Color 3"}]}
])
如果必须在字典列表上进行聚合,并获得每个字典的分组计数,如下所示:
(品牌)品牌1:2
品牌2:1
品牌3:2 (彩色)
颜色1:2
颜色2:2
颜色3:3 获取此信息的相关方法是什么?您必须通过数据获取平面数据集,而不是通过筛选值
db.products.aggregate(
{
$unwind: "$filters",
}, {
$group: {
_id: "$filters.value",
product_names: { $push: "$product_name" } ,
count: { $sum: 1 }
}
});
返回
{
"result" : [
{
"_id" : "Color 3",
"product_names" : [
"Product 5"
],
"count" : 1
},
{
"_id" : "Brand 3",
"product_names" : [
"Product 4",
"Product 5"
],
"count" : 2
},
{
"_id" : "Color 2",
"product_names" : [
"Product 2",
"Product 3"
],
"count" : 2
},
{
"_id" : "Color 1",
"product_names" : [
"Product 1",
"Product 4"
],
"count" : 2
},
{
"_id" : "Brand 2",
"product_names" : [
"Product 2"
],
"count" : 1
},
{
"_id" : "Brand 1",
"product_names" : [
"Product 1",
"Product 3"
],
"count" : 2
}
],
"ok" : 1
}
按如下方式使用此聚合:
db.products.aggregate({
"$unwind": "$filters"
}, {
"$group": {
"_id": {
"value": "$filters.value",
"name": "$filters.name"
},
"count": {
"$sum": 1
}
}
}, {
"$group": {
"_id": "$_id.name",
"data": {
"$push": {
"value": "$_id.value",
"totalCount": "$count"
}
}
}
}).pretty()
可能是@BlakesSeven的复制品:可能不是。你提供的链接是非常具体的猫鼬这是完美的工作,根据我原来的查询!你知道如何使用与solr中相同的上述数据获得类似于multi-select的镶嵌面吗