I have created the following mongoose plugin.
module.exports = function(schema) {
const protectedFields = [];
for (const key in schema.obj) {
if(schema.obj[key].protected) {
protectedFields.push(key);
}
}
schema.pre('save', function(next) {
for (const field of protectedFields) {
this[field] = undefined;
}
next();
});
}
However, when I use it on my model, it does not call the next(). Or at least, once the plugin is applied it does not execute the line after the interaction with the database.
For example if I have following code,
const user = await User.create(req.body);
res.redirect('/backend/users'); // <----- This line is not executed
It does not execute the second line in the above code snippet.
Can anyone please point out to me what I am doing wrong?
Related
I have connected MongoDB to my discord.js code and have made a setwelcome command as per-server data so that each server can customize their own welcome message. Everything works great, I just want to know if there is any way that I can make the message appear as an embed? Here's the code:
//importing all the needed files and languages
const mongo = require('./mongo')
const command = require('./command')
const welcomeSchema = require('./schemas/welcome-schema')
const mongoose = require('mongoose')
const Discord = require('discord.js')
mongoose.set('useFindAndModify', false);
//my code is inside this export
module.exports = (client) => {
//this next line is for later
const cache = {}
command(client, 'setwelcome', async (message) => {
const { member, channel, content, guild } = message
//checking to see that only admins can do this
if (!member.hasPermissions === 'ADMINISTRATOR') {
channel.send('You do not have the permission to run this command')
return
}
//simplifying commands
let text = content
//this is to store just the command and not the prefix in mongo compass
const split = text.split(' ')
if (split.length < 2) {
channel.send('Please provide a welcome message!')
return
}
split.shift()
text = split.join(' ')
//this is to not fetch from the database after code ran once
cache[guild.id] = [channel.id, text]
//this is to store the code inside mongo compass
await mongo().then(async (mongoose) => {
try {
await welcomeSchema.findOneAndUpdate({
_id: guild.id
}, {
_id: guild.id,
channelId: channel.id,
text,
}, {
upsert: true
})
} finally {
mongoose.connection.close()
}
})
})
//this is to fetch from the database
const onJoin = async (member) => {
const { guild } = member
let data = cache[guild.id]
if (!data) {
console.log('FETCHING FROM DATABASE')
await mongo().then( async (mongoose) => {
try {
const result = await welcomeSchema.findOne({ _id: guild.id })
cache[guild.id] = data = [result.channelId, result.text]
} finally {
mongoose.connection.close()
}
})
}
//this is to simplify into variables
const channelId = data[0]
const text = data[1]
/*this is where the message sends on discord. the second of these 2 lines is what I want embedded
which is basically the welcome message itself*/
const channel = guild.channels.cache.get(channelId)
channel.send(text.replace(/<#>/g, `<#${member.id}>`))
}
//this is to test the command
command(client, 'simjoin', message => {
onJoin(message.member)
})
//this is so the command works when someone joins
client.on('guildMemberAdd', member => {
onJoin(member)
})
}
I know how to usually make an embed, but I'm just confused at the moment on what to put as .setDescription() for the embed.
Please advise.
If you just want to have the message be sent as an embed, create a MessageEmbed and use setDescription() with the description as the only argument. Then send it with channel.send(embed).
const embed = new Discord.MessageEmbed();
embed.setDescription(text.replace(/<#>/g, `<#${member.id}>`));
channel.send(embed);
By the way, if you are confused about how to use a specific method you can always search for the method name on the official discord.js documentation so you don’t have to wait for an answer here. Good luck creating your bot!
I am using Protractor. The below solution works, but i get this warning:
this.currentTest.state
- error TS2532: Object is possibly 'undefined'
(property) Mocha.Context.currentTest?: Mocha.Test | undefined
How do i fix this warning?
Test file:
const helper = new HelperClass();
afterEach(async ()=> {
const state = this.currentTest.state;
await helper.getSource(state);
});
Class File
import { browser, } from 'protractor';
export class HelperClass {
public getSource(state:any) {
if (state === 'failed') {
browser.driver.getPageSource().then(function (res) {
console.log(res);
});
}
}
}
I think the error occurs because the access to this.currentTest.state happens inside another function: the arrow function passed in to afterEach--flow analysis does not cross function boundaries. Try simply pulling that line outside of the function:
const helper = new HelperClass();
afterEach(async ()=> {
const state = this.!currentTest.state;
await helper.getSource(state);
});
Does that change anything?
I created a service called AppService.
Its function getUserPostionOptions is supposed to return an object:
getUserPostionOptions: function (user) {
// PositionOptions.findOne({id:'53f218deed17760200778cfe'}).exec(function (err, positionOptions) {
var positionDirectionsOptions = [1,2,3];
var positionLengthsOptions = [4,5,6];
var object = {
directions:positionDirectionsOptions,
lengths:positionLengthsOptions
};
return object;
// });
}
This works, in my controller positionOptions gets populated correctly:
var positionOptions = AppService.getUserPostionOptions(user);
However, when I uncomment the find query the item is found but the object returns undefined.
Thank in advance for your help
SailsJs ORM (and almost NodeJs database querying methods) uses non-blocking mechanism via callback function. So you have to change your code into:
getUserPostionOptions: function (user, callback) {
PositionOptions.findOne({id:'53f218deed17760200778cfe'}).exec(function (err, positionOptions) {
var positionDirectionsOptions = [1,2,3];
var positionLengthsOptions = [4,5,6];
var object = {
directions:positionDirectionsOptions,
lengths:positionLengthsOptions
};
callback(null, object); // null indicates that your method has no error
});
}
Then just use it:
AppService.getUserPostionOptions(user, function(err, options) {
if (!err) {
sails.log.info("Here is your received data:");
sails.log.info(options);
}
});
Is it possible to create new Meteor collections on-the-fly? I'd like to create foo_bar or bar_bar depending on some pathname which should be a global variable I suppose (so I can access it throughout my whole application).
Something like:
var prefix = window.location.pathname.replace(/^\/([^\/]*).*$/, '$1');
var Bar = new Meteor.Collection(prefix+'_bar');
The thing here is that I should get my prefix variable from URL, so if i declare it outside of if (Meteor.isClient) I get an error: ReferenceError: window is not defined. Is it possible to do something like that at all?
Edit : Using the first iteration of Akshats answer my project js : http://pastie.org/6411287
I'm not entirely certain this will work:
You need it in two pieces, the first to load collections you've set up before (on both the client and server)
var collections = {};
var mysettings = new Meteor.Collection('settings') //use your settings
//Startup
Collectionlist = mysettings.find({type:'collection'});
Collectionlist.forEach(function(doc) {
collections[doc.name] = new Meteor.Collection(doc.name);
})'
And you need a bit to add the collections on the server:
Meteor.methods({
'create_server_col' : function(collectionname) {
mysettings.insert({type:'collection', name: collectionname});
newcollections[collectionname] = new Collection(collectionname);
return true;
}
});
And you need to create them on the client:
//Create the collection:
Meteor.call('create_server_col', 'My New Collection Name', function(err,result) {
if(result) {
alert("Collection made");
}
else
{
console.log(err);
}
}
Again, this is all untested so I'm just giving it a shot hopefully it works.
EDIT
Perhaps the below should work, I've added a couple of checks to see if the collection exists first. Please could you run meteor reset before you use it to sort bugs from the code above:
var collections = {};
var mysettings = new Meteor.Collection('settings')
if (Meteor.isClient) {
Meteor.startup(function() {
Collectionlist = mysettings.find({type:'collection'});
Collectionlist.forEach(function(doc) {
eval("var "+doc.name+" = new Meteor.Collection("+doc.name+"));
});
});
Template.hello.greeting = function () {
return "Welcome to testColl.";
};
var collectionname=prompt("Enter a collection name to create:","collection name")
create_collection(collectionname);
function create_collection(name) {
Meteor.call('create_server_col', 'tempcoll', function(err,result) {
if(!err) {
if(result) {
//make sure name is safe
eval("var "+name+" = new Meteor.Collection('"+name+"'));
alert("Collection made");
console.log(result);
console.log(collections);
} else {
alert("This collection already exists");
}
}
else
{
alert("Error see console");
console.log(err);
}
});
}
}
if (Meteor.isServer) {
Meteor.startup(function () {
// code to run on server at startup
Collectionlist = mysettings.find({type:'collection'});
Collectionlist.forEach(function(doc) {
collections[doc.name] = new Meteor.Collection(doc.name);
});
});
Meteor.methods({
'create_server_col' : function(collectionname) {
if(!mysettings.findOne({type:'collection', name: collectionname})) {
mysettings.insert({type:'collection', name: collectionname});
collections[collectionname] = new Meteor.Collection(collectionname);
return true;
}
else
{
return false; //Collection already exists
}
}
});
}
Also make sure your names are javascript escaped.
Things got much easier:
var db = MongoInternals.defaultRemoteCollectionDriver().mongo.db;
db.createCollection("COLLECTION_NAME", (err, res) => {
console.log(res);
});
Run this in your server method.
How do I manage batch save in Mongoose? I saw it may not be possible yet:
How can I save multiple documents concurrently in Mongoose/Node.js?
Theres some mention about using some flow control library like q, but I also notice there promises in mongoose, can it be used? Can I do like in jQuery Deferred/Promises
$.when(obj1.save(), obj2.save(), obj3.save()).then ->
# do something?
Yes, you can do this with promises. If you were using the Q promise library, you could re-write #matz3's code like:
var tasks = [];
for (var i=0; i < docs.length; i++) {
tasks.push(docs[i].save());
}
Q.all(tasks)
.then(function(results) {
console.log(results);
}, function (err) {
console.log(err);
});
We start all the operations one at a time in the loop, but we don't wait for any of them to complete, so they run in parallel. We add a promise (that acts like a placeholder for the result) to an array. We then wait for all the promises in the array of promises to complete.
Most good Promises/A+ compatible libraries have some equivalent to Q.all
mongoose now allows you to choose which Promise implementation.
Here I am using the node.js default system Promise (ES6) baked into nodejs
var mongoose = require('mongoose');
mongoose.Promise = global.Promise; // use system implementation
Promise.all(obj1.save(), obj2.save(), obj3.save())
.then(function(resultSaves) {
console.log('parallel promise save result :');
console.log(resultSaves);
mongoose.disconnect();
}).catch(function(err) {
console.log('ERROR on promise save :');
console.log(err);
mongoose.disconnect();
});
node --version
v4.1.1
mongoose#4.1.8
Since mongoose now supports promises you may use Promise.all().then(), so it will return when all promises are resolved.
Promise.all([
obj1.save(),
obj2.save(),
obj3.save()
])
.then(console.log)
.catch(console.error)
In fact, if you're always calling the save() method you can use the Array.map() here:
Promise.all([ obj1, obj2, obj3 ].map( obj => obj.save() )
Aaand also use es6 syntax to destructure the resulting array:
Promise.all(
[ obj1, obj2, obj3 ]
.map( obj => obj.save() )
)
.then( ([ savedObj1, savedObj2, savedObj3 ]) => {
// do something with your saved objects...
})
Try the parallel function of the async module.
var functions = [];
for (var i=0; i < docs.length; i++) {
functions.push((function(doc) {
return function(callback) {
doc.save(callback);
};
})(docs[i]));
}
async.parallel(functions, function(err, results) {
console.log(err);
console.log(results);
});
To save multiple mongoose docs in parallel, you can do something simple like this (assuming you have an array named docs of documents to save):
var count = docs.length;
docs.forEach(function(doc) {
doc.save(function(err, result) {
if (--count === 0) {
// All done; call containing function's callback
return callback();
}
});
});
A refined example on how to use async parallel would be:
async.parallel([obj1.save, obj2.save, obj3.save], callback);
Since the convention is the same in Mongoose as in async (err, callback) you don't need to wrap them in your own callbacks, just add your save calls in an array and you will get a callback when all is finished.
What about async.queue.
A simple example:
var queue = async.queue(function(obj, callback) {
return obj.save(callback);
});
for (var i in objs) {
var obj = objs[i];
// Some changes on object obj
queue.push(obj);
}
If you need a callback after the queue is emptied:
var emptyQueue = true;
var queue = async.queue(function(obj, callback) {
return obj.save(callback);
});
queue.drain = function() {
// Every callbacks are finished
// bigCallback();
};
for (var i in objs) {
var obj = objs[i];
// Some changes on object obj
queue.push(obj);
emptyQueue = false;
}
if (emptyQueue) {
// Call manually queue drain in case of the queue is empty
// and we need to call bigCallback() for example
return queue.drain();
}
#ForbesLindesay Why loading an external library when you can use mongoose implementation of promises and create your own All ?
Create a module that enhance mongoose promise with all.
var Promise = require("mongoose").Promise;
Promise.all = function(promises) {
var mainPromise = new Promise();
if (promises.lenght == 0) {
mainPromise.resolve(null, promises);
}
var pending = 0;
promises.forEach(function(p, i) {
pending++;
p.then(function(val) {
promises[i] = val;
if (--pending === 0) {
mainPromise.resolve(null, promises);
}
}, function(err) {
mainPromise.reject(err);
});
});
return mainPromise;
}
module.exports = Promise;
Then use it with mongoose:
require('./promise')
...
var tasks = [];
for (var i=0; i < docs.length; i++) {
tasks.push(docs[i].save());
}
mongoose.Promise.all(tasks)
.then(function(results) {
console.log(results);
}, function (err) {
console.log(err);
});