According to the documentation, it seems that one needs to indicate the users list that we want to query e.g.:
const response = await client.queryUsers({ id: { $in: ['john', 'jack', 'jessie'] } });
In this example, we need to indicate that we want the details of these 3 users. Is there a way to query all active users instead of passing an array of ids / names?
I tried:
const response = await client.queryUsers(
{ presence: true },
);
But it returned an empty string.
presence: true registers your client to presence events (online/offline).
There is no support to get this in one go. Also, beware if user is hidden, the user is requesting this information might not be able to see the real online users.
Current recommendation is to get channel with state: true and iterate your members and also setting presence: true, you will be notified by status changes.
Related
Recently I started working on a new project to learn some new technologies (Prisma 2, REST api with Express, etc.). Tho, I faced a problem.
My app has a user authentication system and the user model has a password column. So, when the client requests a user, the backend selects all the columns from the database including the password (that's hashed by the way).
I tried to not select the password column on the prisma findMany, like this:
await prisma.user.findUnique({
where: {
...
},
select: {
password: false
}
});
But I got an error by prisma saying that the select should contain at least one truly value. Thus, I added id: true to the select. I made an api request and I saw that only the id was returning for the user.
By my understanding, prisma expects me to add all the columns I care to the select object. But, I need a lot of columns from the user and I am making a lot of queries to fetch users and I cannot just write all the field I need everytime.
So, I wanted to ask you if there is a legit way to do that.
PS: I don't take "use rawQuery instead" as a solution.
The only legit way is adding column: true to the columns you want to include. There are requests for excluding columns here so it would be great if you could add a 👍 to the request relevant to you so that we can look at the priority.
https://github.com/prisma/prisma/issues/5042
https://github.com/prisma/prisma/issues/7380
https://github.com/prisma/prisma/issues/3796
I've been wondering about how to implement this as well, and bafflingly the issues linked in #Ryan's post are over two years old, and still unresolved. I came up with a temporary workaround, which is to implement a middleware function for the Prisma client which removes the password field manually after each call.
import { PrismaClient } from '#prisma/client'
async function excludePasswordMiddleware(params, next) {
const result = await next(params)
if (params?.model === 'User' && params?.args?.select?.password !== true) {
delete result.password
}
return result
}
const prisma = new PrismaClient()
prisma.$use(excludePasswordMiddlware)
This will check if the model being queried is a User, and it will not delete the field if you explicitly include the password using a select query. This should allow you to still get the password when needed, like when you need to authenticate a user who is signing in:
async validateUser(email: string, password: string) {
const user = await this.prisma.user.findUnique({
where: { email },
select: {
emailVerified: true,
password: true,
},
})
// Continue to validate user, compare passwords, etc.
return isValid
}
Check out the following code
Exclude keys from user
function exclude(user, ...keys) {
for (let key of keys) {
delete user[key]
}
return user
}
function main() {
const user = await prisma.user.findUnique({ where: 1 })
const userWithoutPassword = exclude(user, 'password')
}
reference
prima official Website
I'm trying to make a messaging system that writes each message to a mongo entry. I'd like the message entry to reflect the user that sends the message, and the actual message content. This is the message schema:
const MessageSchema = new Schema({
id: {
type: String,
required: true
},
messages: {
type: Array,
required: true
},
date: {
type: Date,
default: Date.now
}
});
And this is where I either create a new entry, or append to an existing one:
Message.findOne({ id: chatId }).then(message => {
if(message){
Message.update.push({ messages: { 'name': user.name, 'message': user.message } })
} else {
const newMessage = new Message(
{ id: chatId },
{ push: { messages: { 'name': user.name, 'message': user.message } } }
)
newMessage
.save()
.catch(err => console.log(err))
}
})
I'd like the end result to look something like this:
id: '12345'
messages: [
{name: 'David', message: 'message from David'},
{name: 'Jason', message: 'message from Jason'},
etc.
]
Is something like this possible, and if so, any suggestions on how to get this to work?
This questions contains lots of topics (in my mind at least). I really want to try to break this questions to its core components:
Design
As David noted (first comment) there is a design problem here - an ever-growing array as a sub document is not ideal (please refer to this blog post for more details).
On the over hand - when we imagine how a separate collection of messages will looks like, it will be something like this:
_id: ObjectId('...') // how do I identify the message
channel_id: 'cn247f9' // the message belong to a private chat or a group
user_id: 1234 // which user posted this message
message: 'hello or something' // the message itself
Which is also not that great because we are repeating the channel and user ids as a function of time. This is why the bucket pattern is used
So... what is the "best" approach here?
Concept
The most relevant question right now is - "which features and loads this chat is suppose to support?". I mean, many chats are only support messages display without any further complexity (like searching inside a message). Keeping that in mind, there is a chance that we store in our database an information that is practically irrelevant.
This is (almost) like storing a binary data (such an image) inside our db. we can do this, but with no actual good reason. So, if we are not going to support a full-text search inside our messages, there is no point to store the messages inside our db.. at all
But.. what if we want to support a full-text search? well - who said that we need to give this task to our database? we can easily download messages (using pagination) and make the search operation on the client side itself (while keyword not found, download previous page and search it), taking the loads out of our database!
So.. it seems like that messages are not ideal for storage in database in terms of size, functionality and loads (you may consider this conclusion as a shocking one)
ReDesign
Using a hybrid approach where messages are stored in a separated collection with pagination (the bucket pattern supports this as described here)
Store messages outside your database (since your are using Node.js you may consider using chunk store), keeping only a reference to them in the database itself
Set your page with a size relevant to your application needs and also with calculated fields (for instances: number of current messages in page) to ease database loads as much as possible
Schema
channels:
_id: ObjectId
pageIndex: Int32
isLastPage: Boolean
// The number of items here should not exceed page size
// when it does - a new document will be created with incremental pageIndex value
// suggestion: update previous page isLastPage field to ease querying of next page
messages:
[
{ userId: ObjectID, link: string, timestamp: Date }
]
messagesCount: Int32
Final Conclusion
I know - it seems like a complete overkill for such a "simple" question, but - Dawid Esterhuizen convinced me that designing your database to support your future loads from the very beginning is crucial and always better than simplifying db design too much
The bottom line is that the question "which features and loads this chat is suppose to support?" is still need to be answered if you intend to desgin your db efficiently (e.g. to find the Goldilocks zone where your design suits your application needs in the most optimal way)
I am fetching id column value from database for a particular email. In this case I am passing email and want to get primary key i.e id. This operation is successful as I get object which contains Object with the right and expected result. However I am not able to access the object.
I am receiving object like this:
[ UserInfo { id: 21 } ]
And I am not able to access id part of it.
I am using node.js, postgres for database and typeorm library to connect with database.
const id = await userRepo.find({
select:["id"],
where: {
email:email
}
});
console.log(id)
This prints the above object.
The id I am getting is right. But I am not able to retrieve the id part of the object. I tried various ways for e.g.
id['UserInfo'].id, id.UserInfo.
Please help me in accessing the object I am receiving
Typeorm .find() returns an array of objects containing entries corresponding to your filters, in your case, all entries with an email field corresponding to the email you specified.
Because the result is an array, you can access it this way:
const records = await userRepo.find({
select: ['id'],
where: {
email,
},
})
console.log(records[0].id)
You could also use the .findOne() method, which returns a single element and might be a better solution in your case :)
When you are putting a field in the select part select:["id"], you are only retrieving this part of the database.
It is like your query was this: select id from userRepo where email = email
and you need to put * in the select part to retrieve all the information:
const id = await userRepo.find({
select:["*"],
where: {
email:email
}
});
I'm building an AOG (actions on google) project that will do basic transaction functionality. Since I'm still a bit new to AOG, I'm completely stuck on how to take what the user selects (whether it be a carousel, a basic card etc.) and pass that argument value/key that they selected into the proposed order or the order preview before they finish their transaction.
Here is basically what I have tried (This isn't the actual code because it's rather long, but it still gets the idea across)
app.intent('delivery_address_complete', (conv) => {
const arg = conv.arguments.get('DELIVERY_ADDRESS_VALUE');
if (arg.userDecision ==='ACCEPTED') {
conv.ask('Ok, what would you like to order?');
conv.ask(new Suggestions(intentSuggestions));
conv.ask(new Carousel({
items: {
// Add the first item to the carousel
SELECTION_KEY_COFFEE: {
synonyms: [
'Coffee'
],
title: 'Coffee',
description: 'Sweet cream and sugar coffee.',
image: new Image({
url: IMG_URL_COFFEE,
alt: 'Image alternate text',
}),
},
}));
}
});
const yesOrno = [
'Yes',
'No'
];
app.intent('actions.intent.OPTION', (conv ) => {
conv.ask('Okay, are you ready to proceed?');
conv.ask(new Suggestions(yesOrno));
});
app.intent('transaction_decision_action', (conv) => {
const order = {
id: UNIQUE_ORDER_ID,
cart: {
merchant: {
id: 'coffee',
name: 'Coffee Store',
},
lineItems: [
{
name: 'My Memoirs',
id: 'coffee_1',
price: {
amount: {
currencyCode: 'USD',
nanos: 990000000,
units: 3,
},
type: 'ACTUAL',
},
quantity: 1,
subLines: [
{
note: 'coffee',
},
],
type: 'REGULAR',
},
otherItems: [
{
name: 'Subtotal',
id: 'subtotal',
price: {
amount: {
currencyCode: 'USD',
nanos: 220000000,
units: 32,
},
type: 'ESTIMATE',
},
type: 'SUBTOTAL',
},
{
name: 'Tax',
id: 'tax',
price: {
amount: {
currencyCode: 'USD',
nanos: 780000000,
units: 2,
},
type: 'ESTIMATE',
},
type: 'TAX',
},
],
totalPrice: {
amount: {
currencyCode: 'USD',
nanos: 0,
units: 35,
},
type: 'ESTIMATE',
},
};
Please note: This is mostly dummy code, so if some things like over charging or prices not making sense is happening, it's not the problem I'm trying to fix.
How can I take what the user selected from whatever method, and get it so it will appear on the order preview or proposed order? I do not need help with anything regarding making carousels or basic cards ect. Just how to get this selected information to the order preview.
To be more specific:
I can create an order object that is required, and I know how to send it to Google (and then to the user) as part of a ProposedOrder object that becomes part of the TransactionDecision object. (The "transaction_decision_action" Intent handler in the code above.)
What I don't understand is how to build the order based on the user saying things or by selecting on carousel or list items that I've shown them. (What do I do in the "actions.intent.OPTION" Intent handler above, for example?)
edit: This also may clear up any confusion. This is a video representation of what I'm attempting to do (mentioned in comments below):
youtube.com/watch?v=LlgMcJBnNN8 from 1:02 to 1:29 I know how to do, I'm confused (In the video example) how they were able to get the 'turkey sandwich' and the 'Green smoothie' added to the order preview at 1:35 ish from the carousel selections
What you're looking to do is what Google refers to as building the order. As it notes at that link
Once you have the user information you need, you'll build a "cart
assembly" experience that guides the user to build an order. Every
Action will likely have a slightly different cart assembly flow as
appropriate for your product or service.
You could build a cart assembly experience that enables the user to
re-order their most recent purchase via a simple yes or no question.
You could also present the user a carousel or list card of the top
"featured" or "recommended" items. We recommend using rich responses
to present the user's options visually, but also design the
conversation such that the user can build their cart using only their
voice.
For more information on how to build a high-quality cart assembly
experience, see the Transactions Design Guidelines.
So there is no one way to do what you're asking about. However, there are a few tips of things you can and should be doing to build the proposed order.
Managing the order
The big thing you need to do is to keep track of all the things that the user is ordering as you go through the process. There are a number of ways you can store this information:
In a Dialogflow Context
In the user session store
In a database or data store for the session
In short, any of the current ways you have to store session information. All of the information below assumes you've picked some way to do this.
Since everything will become one of the lineItems, an easy solution is to build this array as you go along, and then you can just copy the array directly into the order object. Another approach is to just store a list of item IDs, and then populate the rest of the information later when we build the order.
For this example, we're going to go with this latter scheme (because its easier to show) and store it in the session storage object using the actions-on-google library.
So for starters, when we start the Action, or when we know we'll be taking the order, we need to initialize our list of items being ordered with something like
conv.user.data.items = [];
Now that we have our initial item list, we can explore different ways to add to this list.
Adding an item: "my regular"
For some types of orders, it may make sense for the user to be able to say "I'll have my usual". In cases like this, we want an Intent that handles this phrase (or handles a "yes" response to our prompting), and an Intent Handler that looks up the user's regular order and adds it to the items. Perhaps something like this:
app.intent('order.usual', conv => {
// Get their user profile from our database
// The "loadUser" function is up to you, and has little to do with AoG
return loadUser( conv )
.then( user => {
// Add each item in their usual order to the current items
let usualOrder = user.usualOrder;
usualOrder.forEach( item => conv.user.data.items.push( item ) );
// Send a message back to the user
conv.add( "You got it! Do you want anything else?" );
});
});
Adding an item from a list
If you've presented a carousel or a list to the user of possible items, your life is a little easier (although you may not think it at the moment). You do need to setup a Dialogflow Intent that handles the actions_intent_OPTION event (which I'll call order.option in this case).
In the handler for this, we'll assume that the key you used for the option also happens to be the item ID, so you can just add it to the list
app.intent('order.option', (conv, params, option) => {
// The item is the option sent
let item = option;
// Add the item to the list of items
conv.user.data.items.push( item );
// Send a message back to the user
conv.add( "I've put that in your cart. Anything else?" );
});
Adding an item by name
But remember, the user can take the conversation in any direction at any time. So they may ask for an item that you currently aren't showing in the carousel. The best way to handle this is by creating an Entity Type in Dialogflow (which I'll call item, as an example)
And then an Intent that captures some phrases that expresses the user asking to add them (which I'll call order.name and which has an itemName parameter that the user has to include).
[
In the handler, you need to get the name that they spoke, look up what the item is, and add this to the list of items they've ordered.
app.intent('order.name', (conv, params) => {
// Get the name
let itemName = params['itemName'];
// Look it up to find out what they ordered
// You need to implement the itemFromName function
return itemFromName( itemName )
.then( item => {
// Add the item
conv.user.data.items.push( item );
// And reply
conv.add( "You got it! Anything else?" );
});
});
Finish building the order
Once you've finished collecting everything they want, your Intent Handler should put the order together, assembling the full list of lineItems from the conv.user.data.items array that we've been putting together, calculating tax, totals, and all the other parts of the order.
We then need to propose the order by sending a TransactionDecision object that contains our order in the proposedOrder parameter. Clever, no? Possibly something like this:
app.intent('review', conv => {
// Get the items the user has saved
let items = conv.user.data.items;
// Turn these into more complete lineItems
// You will need to provide the "itemToLineItem" function
let lineItems = items.map( itemToLineItem );
// Get some other objects we need
// You'll need to define these functions, too
let orderId = generateOrderId();
let subtotal = computeSubtotal( lineItems );
let tax = computeTax( lineItems );
let total = computerTotal( subtotal, tax );
// Build the order object
let order = buildOrder( lineItems, subtotal, tax, total );
conv.ask(new TransactionDecision({
orderOptions: {
requestDeliveryAddress: false,
},
paymentOptions: {
googleProvidedOptions: {
prepaidCardDisallowed: false,
supportedCardNetworks: ['VISA', 'AMEX'],
// These will be provided by payment processor,
// like Stripe, Braintree, or Vantiv.
tokenizationParameters: {
tokenizationType: 'PAYMENT_GATEWAY',
parameters: {
'gateway': 'stripe',
'stripe:publishableKey': (conv.sandbox ? 'pk_test_key' : 'pk_live_key'),
'stripe:version': '2017-04-06'
},
},
},
},
proposedOrder: order,
}));
});
I broke most of the stuff out as a function since there is nothing specific about them, except the format of the order (which you illustrate in your example). You can really build it any way you want.
Conclusion
Much of what you need to do really boils down to
Collecting the information of what the user wants to order, mostly storing the IDs of these items
Turning this list of items into the complete order object
Sending this order for the user to review
We have user and news model, in the news model we have e viewsCount field, I want to increment this view count when a GET request is made by a User.
When a specific user makes a GET request, the view count will increment one, every user just one view.
const NEWSModel = new Schema({
viewesCount: { type: Number },
Publisher: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User',
required: true
},
LikesCount: { type: Number },
DislikeCount: { type: Number },
Comments: CommenTs
});
Every user can view the news as many times as wants, but just can make one view. How can I do that?
you Can change your model like and then whenever you get a news just push the user id to the viewedBy field.
news.viewedBy.push(user id)
viewedBy: [{
type: mongoose.Schema.Types.ObjectId,
ref: "User"
}]
}); ```
If you have not a lot of users, you can add additional field to news model like users_viewed which would be array of unique user ids.
And make additional check before incrementing views count.
If user, who requested news is already in this users_viewed array, you skip any additional actions.
If don't, increment views counter.
But if you do have a lot of users, it's better to store views counter in Redis to skip request to database and increment in memory counter.
The logic for storing and showing data would be the same, but you'll reduce load on your database and speed up the whole process.
[UPDATE] According to your comment, about number of users.
To make things work you can use this package.
First of all, after request for a news from a client, you can store all the news data in your cache (to reduce number of requests to your database).
Now you have few possible ways to handle number of views.
I think, the easiest to implement would be to add user unique identifier to SET. And return number of users in SET using SCARD;
In this solution you wouldn't need to check if user already watched the news, because set data structure holds only unique values (the same reason why do we need to use user's unique identifier).
And you just use 2 redis requests, which is pretty good for heavy load services.
You can have another field called viewedBy of type array in which you can store users ids. Then it will be easier to check if a user already viewed your post or to count them.
File: news.model.js
const News = new Schema({
viewedBy: [{
type: mongoose.Schema.Types.ObjectId,
ref: "User"
}],
// other properties...
});
File: news.controller.js
const user = User.find({...}); // get current user
const news = News.find({...}); // get a news
/*
Update views count by adding the current user id if it's not already added
Thanks to '$addToSet', the update() function will do nothing if the user id it's already there)
*/
news.update({ $addToSet: { viewedBy: user._id } });
// Getting the views count
console.log('Total views:', news.viewedBy.length);
More about $addToSet: https://docs.mongodb.com/manual/reference/operator/update/addToSet/