[英]How to return the variant values of each product if that product is a variant?
I have a database in MongoDB like this我在 MongoDB 中有一个这样的数据库
{"productId" : 1,
"isVariant": 1,
"variantId" : 1,
"attributeSet" : [
{
"name" : "Capacity",
"value" : "500 GB",
"id" : 3
},
{
"name" : "Form Factor",
"value" : "5 inch",
"id" : 4
},
{
"id" : 5,
"name" : "Memory Components",
"value" : "3D NAND"
}
]
},
{"productId" : 2,
"isVariant": 1,
"variantId" : 1,
"attributeSet" : [
{
"name" : "Capacity",
"value" : "1 TB",
"id" : 3
},
{
"name" : "Form Factor",
"value" : "5 inch",
"id" : 4
},
{
"id" : 5,
"name" : "Memory Components",
"value" : "3D NAND"
}
]
},
{"productId" : 3,
"isVariant": 1,
"variantId" : 1,
"attributeSet" : [
{
"name" : "Capacity",
"value" : "500 GB",
"id" : 3
},
{
"name" : "Form Factor",
"value" : "2.5 inch",
"id" : 4
},
{
"id" : 5,
"name" : "Memory Components",
"value" : "3D NAND"
}
]
},
{"productId" : 4,
"isVariant": 1,
"variantId" : 1,
"attributeSet" : [
{
"name" : "Capacity",
"value" : "1 TB",
"id" : 3
},
{
"name" : "Form Factor",
"value" : "2.5 inch",
"id" : 4
},
{
"id" : 5,
"name" : "Memory Components",
"value" : "3D NAND"
}
]
}
Now I want to return data where 500 GB has been in productId
1 and 3 The response should be like this:现在我想返回
productId
1 和 3 中有 500 GB 的数据。响应应该是这样的:
variantValues : [{
attributeValue : "500 GB",
data : [
{productId : 1},
{productId : 3}
]},
{
attributeValue : "1 TB",
data : [
{productId : 2},
{productId : 4}
]},
{
attributeValue : "2.5 inch",
data : [
{productId : 3},
{productId : 4}
]},
{
attributeValue : "5 inch",
data : [
{productId : 1},
{productId : 2}
]}]
I have the possible values that I store in another collection for variantPossible
values.我有可能的值,我存储在另一个集合中的
variantPossible
值。 The values that i am storing are like this:我存储的值是这样的:
"VariantValues" : {
"3" : [
"500 GB",
"1 TB"
],
"4" : [
"2.5 inch",
"5 inch"
]
},
I want to return the variant values of each product if that product is a variant with the above format.如果该产品是具有上述格式的变体,我想返回每个产品的变体值。 can anyone help me with this.
谁能帮我这个。
You should be able to achieve this using $unwind
and $group
in your aggregation pipeline.您应该能够在聚合管道中使用
$unwind
和$group
来实现此目的。 This first flattens each attribute into a single document and on those you can group by the attribute value.这首先将每个属性扁平化为一个文档,并且可以按属性值对它们进行分组。
Finally, you can use $project
to get the desired name for attributeValue
:最后,您可以使用
$project
为attributeValue
获取所需的名称:
db.collection.aggregate([
{
$unwind: "$attributeSet"
},
{
$group: {
_id: "$attributeSet.value",
data: {
"$addToSet": {
productId: "$productId"
}
}
}
},
{
"$project": {
_id: 0,
data: 1,
attributeValue: "$_id"
}
}
])
See this simplifed example on mongoplayground: https://mongoplayground.net/p/VASadZnDedc在 mongoplayground 上查看这个简化示例: https://mongoplayground.net/p/VASadZnDedc
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