I am sure I am making something essentially quite wrong, hope someone can help me here.
I have my mongo model defined in my /my_project/lib/collections/item.js
This file has:
import { Mongo } from 'meteor/mongo';
const Item = new Mongo.Collection('item', {connection: null});
export default Item;
Then, I have my /my_project/server/server.js which is:
var log4js = require('log4js');
var logger = log4js.getLogger();
var Item = require('../lib/collections/item.js');
function calculate(params) {
... //removed for brevity
Item.insert({
key:'key',
percentage:profit_in_pct,
createdAt: new Date() // current time
});
}
And the error I am getting is:
I20170925-12:09:03.457(10)? Exception in callback of async function:
TypeError: Item.insert is not a function
I20170925-12:09:03.458(10)? at Object.calculate
(server/server.js:25:8) I20170925-12:09:03.459(10)? at
runWithEnvironment (packages/meteor.js:1189:24)
Any help will be much appreciated. Thanks
Related
I am following the AWS SDK v3 for Javascript guide to display my DynamoDb table names.
https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/welcome.html
However, I am receiving the following error. Any help in understanding why I am receiving this error would be greatly appreciated! :-)
TypeError: Cannot read properties of undefined (reading 'ExclusiveStartTableName')
at serializeAws_json1_0ListTablesInput (C:\source\training\react\portfolio-app\finance_api\node_modules\#aws-sdk\client-dynamodb\dist-cjs\protocols\Aws_json1_0.js:3833:19)
at serializeAws_json1_0ListTablesCommand (C:\source\training\react\portfolio-app\finance_api\node_modules\#aws-sdk\client-dynamodb\dist-cjs\protocols\Aws_json1_0.js:357:27)
at serialize (C:\source\training\react\portfolio-app\finance_api\node_modules\#aws-sdk\client-dynamodb\dist-cjs\commands\ListTablesCommand.js:40:72)
at C:\source\training\react\portfolio-app\finance_api\node_modules\#aws-sdk\middleware-serde\dist-cjs\serializerMiddleware.js:12:27
at C:\source\training\react\portfolio-app\finance_api\node_modules\#aws-sdk\middleware-endpoint\dist-cjs\endpointMiddleware.js:20:16
at async C:\source\training\react\portfolio-app\finance_api\node_modules\#aws-sdk\middleware-logger\dist-cjs\loggerMiddleware.js:5:22
at async listTables (file:///C:/source/training/react/portfolio-app/finance_api/src/helper/listAWSTable.js:6:21)
at async file:///C:/source/training/react/portfolio-app/finance_api/src/helper/runAWSCommands.js:4:1
Here are the contents of the javascript file I am using to extract the list of tables, it's basically copied from the developer-guide.
NB I have substituted in my region and I have AWS credentials loaded in my VSCode.
listAWSTables.js
import { DynamoDBClient, ListTablesCommand } from "#aws-sdk/client-dynamodb";
async function listTables() {
const dbclient = new DynamoDBClient({ region: "ap-southeast-2" });
try {
const results = await dbclient.send(new ListTablesCommand());
results.Tables.forEach(function (item, index) {
console.log(item.Name);
});
} catch (err) {
console.error(err);
}
}
export { listTables };
I call it from another file "runAWSCommands.js":
runAWSCommands.js
import { listTables } from "./listAWSTables.js";
await listTables();
At the commandline I start it off using this command: node runAWSCommands.js
The error:
TypeError: Cannot read properties of undefined (reading 'ExclusiveStartTableName')
It is saying: "The ListTablesCommand cannot read a property from an input that is undefined"
If we look at the definition type of ListTablesCommand:
It expects an input value. If we look at the documentation, we can also see an input variable there.
This input object can be empty, in case you don't want to pass any configuration.
Hence, you can change the line:
const results = await dbclient.send(new ListTablesCommand());
to:
const results = await dbclient.send(new ListTablesCommand({}));
And it should work as expected.
I have a simple Meteor subscription, and I display a loading message while the data is being loaded. But I don't know how to display error message if subscription failed.
export const MyAwesomeComponent = createContainer(() => {
let sub = Meteor.subscribe('some-data');
if (!sub.ready()) return { message: 'Loading...'};
if (sub.failed()) return { message: 'Failed.' }; // How to do this?
return {
data: Data.find().fetch()
}
}, MyInternalRenderComponent);
Problem is, the subscription object doesn't have a failed() method, only a ready() query. How to pass the failure of a subscription as props in a createContainer() method?
I know the Meteor.subscribe method has an onStop callback for this case, but I don't know how to glue it toghether that to pass a property.
After a lot of researching I managed to get this working and I think it answers your question.
Bear in mind I'm using Meteor 1.6, but it should give you the info to get it working on your side.
On the publication/publish:
try {
// get the data and add it to the publication
...
self.ready();
} catch (exception) {
logger.error(exception);
// send the exception to the client through the publication
this.error(new Meteor.Error('500', 'Error getting data from API', exception));
}
On the UI Component:
const errorFromApi = new ReactiveVar();
export default withTracker(({ match }) => {
const companyId = match.params._id;
let subscription;
if (!errorFromApi.get()) {
subscription = Meteor.subscribe('company.view', companyId, {
onStop: function (e) {
errorFromApi.set(e);
}
});
} else {
subscription = {
ready: () => {
return false;
}
};
}
return {
loading: !subscription.ready(),
company: Companies.findOne(companyId),
error: errorFromApi.get()
};
})(CompanyView);
From here all you need to do is get the error prop and render the component as desired.
This is the structure of the error prop (received on the onStop callback from subscribe):
{
error: String,
reason: String,
details: String
}
[Edit]
The reason there is a conditional around Meteor.subscribe() is to avoid an annoying infinite loop you'd get from the natural withTracker() updates, which would cause new subscriptions / new errors from the publication and so on.
Im getting the following two errors when trying to upload my JSON into Firebase:
Console error
Factory:
angular
.module("ngClassifieds")
.factory("classifiedsFactory", function($http, $firebaseArray){
(
var ref = new Firebase('https://xxxxx.firebaseio.com/');
return {
ref: $firebaseArray(ref)
}
});
Controller:
.controller("classifiedsCtrl", function($scope, $http, classifiedsFactory, $mdSidenav, $mdToast, $mdDialog)
I am using the following code to upload my JSON into firebase.
var firebase = classifiedsFactory.ref //we have a variable pointing to our classifiedsFactory reference
angular.forEach(data, function (item) {
firebase.$add(item);
});
Please let me know where I'm going wrong here.
in my custom Polymer element, i have a method that queries a firebase instance like so:
_updateUser: function(user) {
if(this._firebaseRef) {
this._firebaseRef.off()
}
if(user) {
var userLocation = ['xxxxx.firebaseio.com', 'users', this.user.uid].join('/');
this._firebaseRef = new Firebase(userLocation);
var query = this._firebaseRef.orderByChild("username")
query.on("value", function(messageSnapshot) {
messageSnapshot.forEach(function(messageData){
this.set('usernames', []);
console.log(this);
});
},null, this);
}
},
However, I keep getting the following error Uncaught TypeError: this.set is not a function. It seems that this is not set as the context as expected as per the api documentation
May I know how I can call this.set in my callback successfully? Thanks.
You need to pass the context into the forEach function as well.
messageSnapshot.forEach(function (messageData) {...}, this)
or
messageSnapshot.forEach(function (messageData) {...}.bind(this))
Meteor.startup(function () {
Posts.find().observe({
added: function (doc) {
// why does this get called on startup for every document?
}
});
});
What am i trying to do
Listen for new added posts and update another collection.
But why
does my oberve.added code run every time i start my meteor application? I just need it to run when there is is a new post added
Thank you
There's kind of an example in the docs on how to accomplish this. It is written under Meteor.publish. The idea is the following:
var initializing = true;
// observeChanges only returns after the initial `added` callbacks
// have run.
var handle = <Collection>.find(<selector>).observeChanges({
added: function (id) {
if(!initializing){
// A new was added!
}
}
});
initializing = false;