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[图片]

2021-09-29

// 云函数入口文件 const cloud = require('wx-server-sdk') cloud.init() const db=cloud.database() const _ = db.command const $ = db.command.aggregate // 云函数入口函数 exports.main = async(event, context) => {   const wxContext = cloud.getWXContext()   return new Promise((resolve,reject)=>{     db.collection('category').aggregate()     .lookup({       from: 'category',       localField: 'nameA',       foreignField: 'nameA',       as: 'bookList',     })     .project({       nameA: 1,       nameB: 1,       bookList: 1     })     .replaceRoot({       newRoot: {         nameA: '$nameA',         nameB: '$nameB',         images: '$bookList'       }     })     .group({       _id: '$nameA',       child: $.addToSet({         nameB: '$nameB',         images: $.filter({           input: '$images',           as: 'item',           cond: $.eq(['$$item.nameB', '$nameB'])         })       })     })     .end()     .then((res)=>{resolve(res)})     .catch((err)=>{console.log(err)})      }) }

如何将数组中的相同二级分类再合并？

原始数据：[{ { "_id": "8d65afde5e4d2a79010af3ae173f3c31", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "A", "nameB": "A3", "nameC": "E3333" }, { "_id": "8d65afde5e4d2a79010af3b03f094576", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "A", "nameB": "A3", "nameC": "E3333" }, { "_id": "fb16f7905e4d2c00010c97000eab34a6", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A5", "nameC": "E3333" }, { "_id": "4278fc3a5e4d2c080109a9095277efc3", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A5", "nameC": "E222222" }, { "_id": "fb16f7905e4d2c0f010c9de51a769a17", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A5", "nameC": "E11111" }, { "_id": "e30d61715e4d2c15010a550712a94455", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A4", "nameC": "E11111" }, { "_id": "7d79e8035e4d2c1b010b25d421d9aabc", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A4", "nameC": "E222222" }, { "_id": "7d79e8035e4d2c23010b29a05652d1ad", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A4", "nameC": "E3333" }, { "_id": "8d65afde5e4d2c2b010bd06b467f35c3", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A3", "nameC": "E3333" }, { "_id": "e30d61715e4d2c30010a62d60a9231b1", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png", "nameA": "B", "nameB": "A3", "nameC": "E2222" } ] {[图片] 全成后希望变成相同的nameB的image子项并成一个数组，请指教！！！ [ { "_id": "C", "child": [ { "nameB": "A3", "image": [{ "nameC": "E1111", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png" }， { "nameC": "E22222", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png" }， { "nameC": "E33333", "imageC": "http://tmp/wx9696d4e5754a92b0.o6zAJs_sYdqkP5OplRpgfPIz-Vis.9cIQCAVc8Pe4a3f590515973ba69b44c5f86b56dff81.png" } ]

2020-02-24

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云函数已连接数据库，如何实现前端录入项目时，子项和父项会自动分类到数据库。实现相应子项自增？

[图片][图片][图片] 求解！！！！！！！！！！！！！

2020-02-15

求解？

选择图片后为什么用this.setData(）不能将图片传到data{}里？

[图片][图片]

2020-02-08

[图片]

前端连不上云函数，求解？

[图片][图片] 前端与后端写了代码，云函数也上传，但用前端data向云函数event传数据时， return没有反回数据，求解？