node.js - how to fetch seller order from multiple collection data
问题描述
I have 4 collections for store order data.
1. order => field => _id, order_no, cust_id, order_date
2. order_address => field => _id, order_id, cust_name, mobile, address
3. order_details => field => _id, order_id, product_id, seller_id, qty, price
4. order_payment => field => _id, payment_type, payment_status
in that order_details collection has n number of record for a number of product in one order.
in that how to get particular seller order from my data using aggregate in node.js from MongoDB database
i try this code but it's show ordre_details = [] but show order in my result:
var query = [
{ "$lookup": {
from: 'order_details',
let: { order_id: "$_id" },
pipeline: [
{ $match: { $expr: { $and: [{ $eq: [ "$order_id", "$$order_id" ] }, { $eq: [ "$seller_id", ObjectID(seller_id) ] }] } } },
{ $project: {
amount: 1,
cod_charge: 1,
shipping_charge: 1,
pid: 1,
product_attribute_id: 1,
qty: 1
} },
{ "$lookup": {
from: 'product',
let: { product_id: "$pid", product_attribute_id: '$product_attribute_id'},
pipeline: [
{ $match: { $expr: { $eq: [ "$_id", "$$product_id" ] } } },
{ $project: { _id: 1, name: 1, sku: 1 } },
{ "$lookup": {
from: 'product_image',
let: { product_attribute_id: '$$product_attribute_id' },
pipeline: [
{ $match: { $expr: { $eq: [ "$product_attribute_id", "$$product_attribute_id" ] } } },
{ $project: { _id: 0, image: 1, is_default: 1 } },
{ $sort : { is_default: -1 } },
{ $replaceRoot: { newRoot: {_id: "$_id", image: "$image" } } }
],
as: 'product_image'
} },
{ $replaceRoot: { newRoot: {
_id: "$_id",
name: "$name",
sku: "$sku",
image: { $arrayElemAt: [ "$product_image.image", 0 ] }
} } }
],
as: 'product'
} },
{ "$replaceRoot": { newRoot: {
_id: '$$ROOT._id',
pid: '$$ROOT.pid',
amount: '$$ROOT.amount',
cod_charge: '$$ROOT.cod_charge',
shipping_charge: '$$ROOT.shipping_charge',
product_attribute_id: "$$ROOT.product_attribute_id",
qty: "$$ROOT.qty",
product: { $arrayElemAt: [ "$product", 0 ] },
} } },
],
as: 'order_details'
} },
{ "$replaceRoot": {
newRoot: {
_id: "$_id",
order_no: "$order_no",
cust_id: "$cust_id",
order_date: "$order_date",
order_details: "$order_details"
}
} }
]
orderModel.order.aggregate(query, function(err, orderData){})
解决方案
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