We're having a lot of trouble doing a partial update in DynamoDB.
Trying to use best practices in NoSQL by using aggregates instead of entities so our data looks a bit like this:
[
{
"userLogin": {
"ipAddress": "123.222.121.1234",
"lastLogin": "2017-10-16T17:38:59.818Z",
"userAgent": "bob",
"geoLocation": "lat-121 long-312"
},
"addresses": {
"billingAddress": {
"streetName": "york street",
"province": "ontario",
"city": "toronto",
"streetNumber": "18",
"postalCode": "m5a2v7"
},
"businessAddress": {
"streetName": "york street",
"province": "ontario",
"city": "toronto",
"streetNumber": "18",
"postalCode": "m5a2v7"
},
"mailingAddress": {
"streetName": "york street",
"province": "ontario",
"city": "toronto",
"streetNumber": "18",
"postalCode": "m5a2v7"
},
},
"paymentTransaction": {
"orderId": 5,
"amount": 75,
"transactionTimestamp": "2017-10-16T17:38:59.818Z"
},
"userId": "00uc4sxyi7gfQoFum0h7",
"phoneNumbers": {
"workNumber": "647-123-1234",
"homeNumber": "647-321-4321"
},
"userProfile": {
"role": "admin",
"verifiedTimeStamp": "2017-10-16T17:38:59.818Z",
"termsConditionTimeStamp": "2017-10-16T17:38:59.818Z",
"verified": "TRUE",
"createdTimeStamp": "2017-10-16T17:38:59.818Z",
"termsConditionVersion": "1.0",
"email": "kyle.truong#test.io"
}
}
]
All we want to do is make a request with a body like this:
PUT /api/user-profiles/00uc4sxyi7gfQoFum0h7
body: {
"userLogin": { "lastLogin": "2017-12-16T17:38:59.818Z" }
}
and have it update the one attribute in the User table.
The updateItem API seems to require defining the attributes you want to update before updating them, but we want it be more flexible and dynamic based on the body of the request.
This thread seems to say it's not possible:
How to update multiple items in a DynamoDB table at once
If so, what's the best way to go about updating just a partial attribute object within an item in DynamoDB?
In dynamoDB if your userLogin is a map type then you can update the value of lastLoginkey. In Java below code may help. Here column name would be userLogin and newKey would be lastLogin. Full code snippet can be found here
UpdateItemSpec updateItemSpec = new UpdateItemSpec().withPrimaryKey(primaryKey,primaryKeyValue).withReturnValues(ReturnValue.ALL_NEW).
withUpdateExpression("set #columnName." + newKey + " = :columnValue").
withNameMap(new NameMap().with("#columnName", updateColumn)).
withValueMap(new ValueMap().with(":columnValue", newValue)).withConditionExpression("attribute_exists("+ updateColumn +")");
table.updateItem(updateItemSpec);
Related
i have an array of objects in json and i want to pull only specific data from it, how can i do that?
heres my files:
import Stocks from "./stocks.json";
export default function Profile() {
return (
<>
<h1>{Stocks.symbol}</h1>
<h1>{Stocks.lastsale}</h1>
</>
);
}
and stocks.json
{
"symbol": "AAMC",
"name": "Altisource Asset Management Corp Com",
"lastsale": "$36.38",
"netchange": "0.88",
"pctchange": "2.479%",
"volume": "11317",
"marketCap": "64654718.00",
"country": "United States",
"ipoyear": "",
"industry": "Investment Managers",
"sector": "Finance",
"url": "/market-activity/stocks/aamc"
}
https://codesandbox.io/s/distracted-leftpad-ve6ch0?file=/App.js
this way above it works perfectly, the problem is that i want to have multiple objects inside the json file, as follow:
[
{
"symbol": "AAMC",
"name": "Altisource Asset Management Corp Com",
"lastsale": "$36.38",
"netchange": "0.88",
"pctchange": "2.479%",
"volume": "11317",
"marketCap": "64654718.00",
"country": "United States",
"ipoyear": "",
"industry": "Investment Managers",
"sector": "Finance",
"url": "/market-activity/stocks/aamc"
},
{
"symbol": "AAU",
"name": "Almaden Minerals Ltd. Common Shares",
"lastsale": "$0.2167",
"netchange": "-0.0036",
"pctchange": "-1.634%",
"volume": "196889",
"marketCap": "29735879.00",
"country": "Canada",
"ipoyear": "2015",
"industry": "",
"sector": "",
"url": "/market-activity/stocks/aau"
}
]
my objective is to pull the data from a specific stock, like the "lastsale" for example
thanks in advance!
in kinda new to programming
i want to be able, to pull only the data from a specific stock, like using the AMMC symbol as a input to get the "lastsale" from it
You would need to find your desired stock using array search methods like, .find, .findIndex or just .filter.
In this specific case you can use:
const AAMCStock = Stocks.find(stock => stock.symbol === "AAMC")
const lastSale = AAAMStock.lastsale
You can find more information about this method here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
I have three documents that look like this
{
"name": "X1",
"location": {
"country": "Ireland",
"state": "Dublin",
},
},
{
"name": "X2",
"location": {
"country": "Ireland",
"state": "Dublin",
"address": ""
},
},
{
"name": "C3",
"location": {
"country": "United States of America",
"state": "California",
"address": "San Jose"
},
I am trying to implement a filtering functionality to show documents based on multiple locations.
so, the endpoint URL looks like this for example http://localhost:3000/api/companies/stacks?state[]=Dublin&country[]=United%20States%20of%20America
So, it should return the three documents that are shown above, yet it only returns this document
{
"name": "C3",
"location": {
"country": "United States of America",
"state": "California",
"address": "San Jose"
},
Here is the source code, I am using Mongoose mainly.
//Filtering by location
if ('country' in req.query) {
const countries = [...country]
conditions['location.country']={$in:countries}
}
if ('state' in req.query) {
const states = [...state]
conditions['location.states'] = { $in: states }
}
const doc = await model
.find(conditions)
.sort({ p: -1, _id: 1 })
.lean()
.exec()
I understood that it returns the document that matches the country parameter, but I don't understand why it doesn't also fetch the other documents that has Dublin in states?
Edit: I also tried to use $or operator like that
find({
$or:[
{'location.country':'United States of America'},
{'location.states':'Dublin'}
]
})
Yet it also, returned the document that matches the country only. I thought about using aggregates but I am not sure if it is going to help me in my case?
Thanks in advance.
In MongoDB the relationships can be are set by using the _id of the parent in the child object example In the two objects written below the relationship is set between the two by the owner attribute.
{
"_id":ObjectId("52ffc33cd85242f436000001"),
"name": "Tom Hanks",
"contact": "987654321",
"dob": "01-01-1991"
}
{
"_id":ObjectId("52ffc33cd85242f436000001"),
"owner": ObjectId("52ffc33cd85242f436000001"),
"address": [
{
"building": "22 A, Indiana Apt",
"pincode": 123456,
"city": "Los Angeles",
"state": "California"
},
{
"building": "170 A, Acropolis Apt",
"pincode": 456789,
"city": "Chicago",
"state": "Illinois"
}
]
}
My concerns is to take a decision between two collection based on _id attribute, if I use the _id attribute in the child collection should be it of type ObjectID (as shown in the example above) or should the child object use the _id vale from the parent as a string type (eg "owner": "52ffc33cd85242f436000001"),
what should be the best practice with some pons and cons.
For a project I'm doing I'm outputting an array of data using ng-repeat from AngularJS and am trying to group the output by Month. There's no need to orderBy, since the data I get is already sorted, I just need to group it by Month.
The data I get from the API looks similar like this:
{"userinfo": [{
"date": "1305838800000",
"name": "john",
"lastname": "dough",
"city": "",
"province": "noord-holland",
"device": "macbook",
"phone": "iphone",
"provider": "t-mobile"
}, {
"date": "1305838800000",
"name": "john",
"lastname": "",
"city": "amsterdam",
"province": "noord-holland",
"device": "macbook",
"phone": "iphone",
"provider": "vodafone"
},{
"date": "1305838800000",
"name": "john",
"lastname": "",
"city": "amsterdam",
"province": "noord-holland",
"device": "macbook",
"phone": "iphone",
"provider": "t-mobile"
}, {
"date": "1305838800000",
"name": "john",
"lastname": "",
"city": "amsterdam",
"province": "noord-holland",
"device": "macbook",
"phone": "iphone",
"provider": "vodafone"
}]}
In here the field field would be the epoch date of the date I want to group by.
Any help on this grouping matter would be appreciated.
While this functionality will not land in AngularJS core:
https://github.com/angular/angular.js/issues/1649
You can either go with re-grouping an array into a map object on scope (Underscore.JS's groupBy is a nice example) or creating a new groupBy filter/use existing ones like:
https://github.com/samstokes/ng-group/
One plus for regrouping on scope - it will only happen once, while filters are re-evaluated on each digest.
There's no support for this kind of grouping in built-in angular directives. You'll need to create a copy of your model that you get from the server (a new collection), "manually" group the objects in the according months (by date) and then loop over that copy (in the view by using ng-repeat) instead of looping over the original model.
I have a nested json. I want to post it as a form input value.
But, seems like jquery puts "Object object" string into the value.
It seems easier to pass around the string and convert into the native form I need, than dealing with json as I don't need to change anything once it is generated.
What is the simplest way to convert a json
var json = {
"firstName": "John",
"lastName": "Smith",
"age": 25,
"address": {
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021"
},
"phoneNumber": [
{ "type": "home", "number": "212 555-1234" },
{ "type": "fax", "number": "646 555-4567" }
],
"newSubscription": false,
"companyName": null
};
into its string form?
var json = '{
"firstName": "John",
"lastName": "Smith",
"age": 25,
"address": {
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021"
},
"phoneNumber": [
{ "type": "home", "number": "212 555-1234" },
{ "type": "fax", "number": "646 555-4567" }
],
"newSubscription": false,
"companyName": null
}'
Following doesn't do what I need:
Json.stringify()
jQuery doesn't have a method for JSON stringifying native objects. You will need json2.js which will provide the JSON.stringify() method to browsers that don't already support it.