您好，我是Node的新手，我正在尝试将数据保存在猫鼬中。问题是有3个集合单元，建筑物和部分。构建方案为：
var buildingsSchema=new Schema({
buildingname:String,
status:String
});
本节的模式为：
var sectionsSchema=new Schema({
section_type:String,
buildings:{ type: Schema.Types.ObjectId, ref: 'buildings' },
status:String
});
单位示意图为：
var unitsSchema=new Schema({
unit_type:String,
unit_num:String,
unit_ac_num:Number,
buildings:{ type: Schema.Types.ObjectId, ref: 'buildings' },
sections:{ type: Schema.Types.ObjectId, ref: 'sections' },
shares:Number
});
在“区段”中有建筑物的ID，在“单位”中有建筑物和区段的ID
现在我已经使用xlsx插件通过：-将上传的excel文件转换为json
var wb = XLSX.readFile("uploads/xls/" + req.file.filename);
data = XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]], {header:1});
并将其映射到json对象并保存，我正在使用异步瀑布模型
for (var index = 1; index < data.length - 1 ; index++) {
var ele= data[index];
// console.log(ele);
var d = { // this is an object which will hold data
record_id: ele[0],
residenceone_unit_id : ele[1],
official_unit_id: ele[2],
building: ele[3],
unit_type : ele[4],
section: ele[5],
shares: ele[6],
unit_style : ele[7]
}
// console.log(d);
var unt = new Units(); // to save units
unt = {
unit_type: d.unit_type,
unit_num: d.residenceone_unit_id,
unit_ac_num: d.official_unit_id,
buildings: '', // empty because need to put id of that particular building
sections: '', // empty because need to put id of that particular sections
shares:d.shares
}
async.waterfall([
function (callback) {
// find building first
Buildings.findOne({buildingname : ele.building})
.exec(function (err,doc) {
if (err) {
return callback(err);
}
// if no building then save one
else if (!doc) {
// console.log("Building is going to save")
var build = new Buildings();
build.buildingname = d.building;
build.status = "active";
build.save(function (err,dc) {
if (err) {
return callback(err);
}
else {
// assign id of building to unit
unt.buildings = dc._id ;
callback(null);
}
})
}
else {
// if building is there then no need to save assign id of it to units
// console.log("Building already exists;")
unt.buildings = doc._id ;
// execute second function
callback(null);
}
// callback(null);
})
},
function (callback) {
// same as building find section of that building first with building Id and section type
Sections.findOne({buildings : unt.buildings,section_type: d.section})
.exec(function (err,doc) {
if (err) {
return callback(err);
}
if (!doc) {
// if no section of that building is there then save one
// console.log("Section needs to be save")
var sect = new Sections();
sect.section_type = d.section;
sect.buildings = unt.buildings;
sect.status = "active";
sect.save(function (err,dc) {
if (err) {
return callback(err);
}
else {
// assign its id to unit
// console.log("Section is saved")
unt.sections = dc._id;
// execute third function
callback(null);
}
})
}
else {
// if there is section of that building id is available than assign id to units
// console.log("Section already exists");
unt.sections = doc._id;
// execute third function
callback(null);
}
})
},
function (callback) {
// there is no need to seaarch just need to save unit
// console.log("Units is going to save")
// console.log(unt);
unt.save(function (err, doc) {
if (err) {
} else if (doc){
// console.log("Unit Saved");
// console.log(doc);
}
})
}
])
}
}
它的工作，但每次而不是在mongodb中搜索数据，而是每次都保存。如果在mongodb中保存单位有任何其他方法可以帮助我，那么重复是主要问题。
最佳答案
首先我有保存建筑物和部分：
async.every(uniqueSection,function (uS,callback) {
if (uS != undefined) {
console.log(uS);
Buildings.findOne({buildingname:uS.building}, function (err,doc) {
if (doc) {
// console.log(doc);
Sections.findOne({buildings:doc._id,section_type:uS.section},function (er,sd) {
if (sd) {
// then dont save
console.log(sd);
}
if (er) {
console.log(er);
}
if (!sd) {
// then save
var sect = new Sections();
sect.buildings = doc._id;
sect.section_type = uS.section;
sect.status = 'active';
sect.save(function (err,st) {
if(err) console.log(err);
console.log(st);
})
}
})
}
if (!doc) {
if (uS.building != undefined) {
var building = new Buildings();
building.buildingname = uS.building;
building.status = "active";
building.save(function (er,dc) {
if (dc) {
// console.log(dc);
Sections.findOne({buildings:dc._id,section_type:uS.section},function (er,sd) {
if (sd) {
// then dont save
console.log(sd);
}
if (er) {
console.log(er);
}
if (!sd) {
// then save
var sect = new Sections();
sect.buildings = dc._id;
sect.section_type = uS.section;
sect.status = 'active';
sect.save(function (err,st) {
if(err) console.log(err);
console.log(st);
})
}
})
}
if (er) {
console.log(er);
}
})
}
}
if (err) {
console.log(err);
}
})
}
})
那么我已经通过以下方式保存了单位：
async.waterfall([
function(callback) {
Buildings.findOne({buildingname:d.building}, function (err,doc) {
if (doc) {
buildingId = doc._id;
callback(null, doc);
}
if (err) {
console.log(err);
}
})
},
function(doc,callback) {
Sections.findOne({buildings: buildingId,section_type:d.section},function (er,sd) {
if (sd) {
sectionId = sd._id;
callback(null,doc,sd);
}
if (er) {
console.log(er);
}
})
},
function (bld,st,callback) {
var s = d.shares.replace(",","");
var unit = {
unit_type: d.unit_type,
unit_num: d.residenceone_unit_id,
unit_ac_num: d.official_unit_id,
buildings: bld._id,
sections: st._id,
shares: s
}
Units.findOne(unit,function (err,unt) {
if (err) {
console.log(err);
}
if(unt) {
console.log(unt)
}
if (!unt) {
var units = new Units();
units.unit_type = d.unit_type;
units.unit_num = d.residenceone_unit_id;
units.unit_ac_num = d.official_unit_id;
units.buildings = bld._id;
units.sections = st._id;
units.shares = s;
units.save(function (er,doc) {
if (er) console.log(er);
console.log(doc);
})
}
})
}
], function(err) {
console.log(err)
});
关于json - 如何使用 Mongoose 和异步 waterfall 模型将数据存储在MongoDb中，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/46484088/