[英]How to define object in array in Mongoose schema correctly with 2d geo index
I'm currently having problems in creating a schema for the document below.我目前在为以下文档创建架构时遇到问题。 The response from the server always returns the "trk" field values as [Object].
来自服务器的响应总是将“trk”字段值返回为 [Object]。 Somehow I have no idea how this should work, as I tried at least all approaches which made sense to me ;-)
不知何故,我不知道这应该如何工作,因为我至少尝试了所有对我有意义的方法;-)
If this helps, my Mongoose version is 3.6.20 and MongoDB 2.4.7 And before I forget, it would be nice to also set it as Index (2d)如果这有帮助,我的 Mongoose 版本是 3.6.20 和 MongoDB 2.4.7 在我忘记之前,最好也将其设置为 Index (2d)
Original data:原始数据:
{
"_id": ObjectId("51ec4ac3eb7f7c701b000000"),
"gpx": {
"metadata": {
"desc": "Nürburgring VLN-Variante",
"country": "de",
"isActive": true
},
"trk": [
{
"lat": 50.3299594,
"lng": 6.9393006
},
{
"lat": 50.3295046,
"lng": 6.9390688
},
{
"lat": 50.3293714,
"lng": 6.9389939
},
{
"lat": 50.3293284,
"lng": 6.9389634
}]
}
}
Mongoose Schema:猫鼬模式:
var TrackSchema = Schema({
_id: Schema.ObjectId,
gpx: {
metadata: {
desc: String,
country: String,
isActive: Boolean
},
trk: [{lat:Number, lng:Number}]
}
}, { collection: "tracks" });
The response from the Network tab in Chrome always looks like this (that's only the trk-part which is wrong) : Chrome 中网络选项卡的响应总是如下所示(这只是错误的 trk 部分):
{ trk:
[ [Object],
[Object],
[Object],
[Object],
[Object],
[Object],
I already tried different Schema definitions for "trk":我已经为“trk”尝试了不同的模式定义:
Hope you can help me ;-)希望你能帮我 ;-)
You can declare trk by the following ways : - either您可以通过以下方式声明 trk : - 要么
trk : [{
lat : String,
lng : String
}]
or或者
trk : { type : Array , "default" : [] }
In the second case during insertion make the object and push it into the array like在插入期间的第二种情况下,制作对象并将其推入数组中
db.update({'Searching criteria goes here'},
{
$push : {
trk : {
"lat": 50.3293714,
"lng": 6.9389939
} //inserted data is the object to be inserted
}
});
or you can set the Array of object by或者您可以设置对象数组
db.update ({'seraching criteria goes here ' },
{
$set : {
trk : [ {
"lat": 50.3293714,
"lng": 6.9389939
},
{
"lat": 50.3293284,
"lng": 6.9389634
}
]//'inserted Array containing the list of object'
}
});
I had a similar issue with mongoose :我对 mongoose 有类似的问题:
fields:
[ '[object Object]',
'[object Object]',
'[object Object]',
'[object Object]' ] }
In fact, I was using "type" as a property name in my schema :事实上,我在架构中使用“类型”作为属性名称:
fields: [
{
name: String,
type: {
type: String
},
registrationEnabled: Boolean,
checkinEnabled: Boolean
}
]
To avoid that behavior, you have to change the parameter to :为避免这种行为,您必须将参数更改为:
fields: [
{
name: String,
type: {
type: { type: String }
},
registrationEnabled: Boolean,
checkinEnabled: Boolean
}
]
For making an array in schema we have to make one more schema as monetizationSchema
which is used to store one data at a time and another as blogSchema
we have monetization
field containing monetizationSchema
in square brackets as an array.为了在模式中创建一个数组,我们必须再创建一个模式作为
monetizationSchema
,它用于一次存储一个数据,另一个作为blogSchema
,我们在方括号中包含monetizationSchema
作为数组的monetization
字段。
Schema
for storing one data at a time.一次存储一个数据的
Schema
。
const monetizationSchema = new Schema({
amazonUrl: {
type: String,
required: true,
}
});
Schema with monetization
as an array.以数组形式
monetization
的架构。
const blogSchema = {
monetization: [
monetizationSchema
],
image: {
type: String,
required: true
},
// ... etc
});
The problem I need to solve is to store contracts containing a few fields (address, book, num_of_days, borrower_addr, blk_data), blk_data is a transaction list (block number and transaction address).我需要解决的问题是存储包含几个字段(address、book、num_of_days、borrower_addr、blk_data)的合约,blk_data 是一个交易列表(区块号和交易地址)。 This question and answer helped me.
这个问题和答案帮助了我。 I would like to share my code as below.
我想分享我的代码如下。 Hope this helps.
希望这可以帮助。
- Schema definition.
架构定义。 See blk_data.
请参见 blk_data。
var ContractSchema = new Schema(
{
address: {type: String, required: true, max: 100}, //contract address
// book_id: {type: String, required: true, max: 100}, //book id in the book collection
book: { type: Schema.ObjectId, ref: 'clc_books', required: true }, // Reference to the associated book.
num_of_days: {type: Number, required: true, min: 1},
borrower_addr: {type: String, required: true, max: 100},
// status: {type: String, enum: ['available', 'Created', 'Locked', 'Inactive'], default:'Created'},
blk_data: [{
tx_addr: {type: String, max: 100}, // to do: change to a list
block_number: {type: String, max: 100}, // to do: change to a list
}]
}
);
- Create a record for the collection in the MongoDB.
在 MongoDB 中为集合创建一条记录。 See blk_data.
请参见 blk_data。
// Post submit a smart contract proposal to borrowing a specific book.
exports.ctr_contract_propose_post = [
// Validate fields
body('book_id', 'book_id must not be empty.').isLength({ min: 1 }).trim(),
body('req_addr', 'req_addr must not be empty.').isLength({ min: 1 }).trim(),
body('new_contract_addr', 'contract_addr must not be empty.').isLength({ min: 1 }).trim(),
body('tx_addr', 'tx_addr must not be empty.').isLength({ min: 1 }).trim(),
body('block_number', 'block_number must not be empty.').isLength({ min: 1 }).trim(),
body('num_of_days', 'num_of_days must not be empty.').isLength({ min: 1 }).trim(),
// Sanitize fields.
sanitizeBody('*').escape(),
// Process request after validation and sanitization.
(req, res, next) => {
// Extract the validation errors from a request.
const errors = validationResult(req);
if (!errors.isEmpty()) {
// There are errors. Render form again with sanitized values/error messages.
res.status(400).send({ errors: errors.array() });
return;
}
// Create a Book object with escaped/trimmed data and old id.
var book_fields =
{
_id: req.body.book_id, // This is required, or a new ID will be assigned!
cur_contract: req.body.new_contract_addr,
status: 'await_approval'
};
async.parallel({
//call the function get book model
books: function(callback) {
Book.findByIdAndUpdate(req.body.book_id, book_fields, {}).exec(callback);
},
}, function(error, results) {
if (error) {
res.status(400).send({ errors: errors.array() });
return;
}
if (results.books.isNew) {
// res.render('pg_error', {
// title: 'Proposing a smart contract to borrow the book',
// c: errors.array()
// });
res.status(400).send({ errors: errors.array() });
return;
}
var contract = new Contract(
{
address: req.body.new_contract_addr,
book: req.body.book_id,
num_of_days: req.body.num_of_days,
borrower_addr: req.body.req_addr
});
var blk_data = {
tx_addr: req.body.tx_addr,
block_number: req.body.block_number
};
contract.blk_data.push(blk_data);
// Data from form is valid. Save book.
contract.save(function (err) {
if (err) { return next(err); }
// Successful - redirect to new book record.
resObj = {
"res": contract.url
};
res.status(200).send(JSON.stringify(resObj));
// res.redirect();
});
});
},
];
- Update a record.
更新记录。 See blk_data.
请参见 blk_data。
// Post lender accept borrow proposal.
exports.ctr_contract_propose_accept_post = [
// Validate fields
body('book_id', 'book_id must not be empty.').isLength({ min: 1 }).trim(),
body('contract_id', 'book_id must not be empty.').isLength({ min: 1 }).trim(),
body('tx_addr', 'tx_addr must not be empty.').isLength({ min: 1 }).trim(),
body('block_number', 'block_number must not be empty.').isLength({ min: 1 }).trim(),
// Sanitize fields.
sanitizeBody('*').escape(),
// Process request after validation and sanitization.
(req, res, next) => {
// Extract the validation errors from a request.
const errors = validationResult(req);
if (!errors.isEmpty()) {
// There are errors. Render form again with sanitized values/error messages.
res.status(400).send({ errors: errors.array() });
return;
}
// Create a Book object with escaped/trimmed data
var book_fields =
{
_id: req.body.book_id, // This is required, or a new ID will be assigned!
status: 'on_loan'
};
// Create a contract object with escaped/trimmed data
var contract_fields = {
$push: {
blk_data: {
tx_addr: req.body.tx_addr,
block_number: req.body.block_number
}
}
};
async.parallel({
//call the function get book model
book: function(callback) {
Book.findByIdAndUpdate(req.body.book_id, book_fields, {}).exec(callback);
},
contract: function(callback) {
Contract.findByIdAndUpdate(req.body.contract_id, contract_fields, {}).exec(callback);
},
}, function(error, results) {
if (error) {
res.status(400).send({ errors: errors.array() });
return;
}
if ((results.book.isNew) || (results.contract.isNew)) {
res.status(400).send({ errors: errors.array() });
return;
}
var resObj = {
"res": results.contract.url
};
res.status(200).send(JSON.stringify(resObj));
});
},
];
Thanks for the replies.感谢您的回复。
I tried the first approach, but nothing changed.我尝试了第一种方法,但没有任何改变。 Then, I tried to log the results.
然后,我尝试记录结果。 I just drilled down level by level, until I finally got to where the data was being displayed.
我只是逐级向下钻取,直到最终到达显示数据的位置。
After a while I found the problem: When I was sending the response, I was converting it to a string via .toString()
.过了一会儿,我发现了问题:当我发送响应时,我通过
.toString()
将其转换为字符串。
I fixed that and now it works brilliantly.我解决了这个问题,现在它工作得很好。 Sorry for the false alarm.
很抱歉误报。
You can declare an array as below您可以如下声明一个数组
trk : [{
lat : String,
lng : String
}]
but it will set []
(empty array) as the default value.但它会将
[]
(空数组)设置为默认值。
If you don't want this default value then to overwrite this default, you need to set the default value to undefined
as below如果你不想要这个默认值然后覆盖这个默认值,你需要将默认值设置为
undefined
如下
trk: {
type: [{
lat : String,
lng : String
}],
default: undefined
}
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