I do such node.js Sequelize query to get rows quantity of included unread_messages, so I can get amount of unread messages of specifi user. But it returns me Unknown column 'unread_messages.id' in 'field list'.
If I remove attributes: {...} error disappears
const result = await Chats.findAndCountAll({
attributes: {
include: [[Sequelize.fn('COUNT', Sequelize.col('unread_messages.id')), 'total_unread_messages']]
},
where: {
...(req.query.filters as WhereOptions),
},
include: [
{ model: Users, as: 'createdBy', required: false },
{ model: ChatTypes, as: 'type', required: false },
{
model: ChatMessages,
as: 'unread_messages',
where: {
id: {[Op.gt]: Sequelize.literal(`(
SELECT last_read_message_id
FROM chats_users
WHERE
user_id = '${req.user?.id}'
AND
chat_id = Chats.id
)`),}
},
required: false,
},
{
model: ChatMessages,
as: 'last_message',
required: false,
include: [
{ model: Users, as: 'to_user' },
{ model: Users, as: 'from_user' },
{ model: Chats, as: 'chat' },
{ model: MessageTypes, as: 'message_type' },
{
model: Users,
as: 'is_mine',
required: false,
where: { id: req.user?.id },
},
],
},
],
group:['chats.id'],
order: req.query.sort as Order,
offset,
limit,
});
Related
I am trying to count number of Followers and Followings of a user.
as followingCount and followerCount
User Model
User.init(
{
id: {
allowNull: false,
primaryKey: true,
type: DataTypes.UUID,
defaultValue: DataTypes.UUIDV4,
},
email: {
type: DataTypes.STRING,
},
password: {
type: DataTypes.STRING,
},
}
);
static associate(models) {
// Follow relationship
this.belongsToMany(models.User, {
through: 'UserFollow',
foreignKey: 'followerId',
as: 'following',
});
// Follow relationship
this.belongsToMany(models.User, {
through: 'UserFollow',
foreignKey: 'followeeId',
as: 'follower',
});
}
Where UserFollow is a Joint Table with columns followeeId and followerId.
My current approach for finding number of followings is something like this :
const user = await User.findOne({
where: {
id,
},
attributes: [
'id',
'userName',
'email',
[sequelize.fn('COUNT', sequelize.col('following->UserFollow.followeeId')), 'followingCount'],
],
include: [
{
model: User,
as: 'following',
attributes: ['id', 'userName', 'email'],
through: {
attributes: [],
},
},
],
group: ['User.id', 'following.id'],
});
return user;
And Output getting is like this:
Here I am getting followingCount as 1... but it should be 3.
"data": {
"id": "1af4b9ea-7c58-486f-a37a-e46461487b06",
"userName": "xyz",
"email": "xyz#gmail.com",
"followingCount": "1", <------ I want this to be 3
"following": [
{
"id": "484202b0-a6d9-416d-a8e2-6681deffa3d1",
"userName": "uqwheuo",
"email": "uqwheuo#gmail.com"
},
{
"id": "56c8d9b0-f5c6-4b2e-b32c-be6363294614",
"userName": "aiwhroanc",
"email": "aiwhroanc#gmail.com"
},
{
"id": "9a3e4074-c7a0-414e-8df4-cf448fbaf5fe",
"userName": "iehaocja",
"email": "iehaocja#gmail.com"
}
]
}
I am not able to count in Joint Table..
The reason that you are getting followingCount: 1 is that you group by following.id (followeeId). It only counts unique followeeId which is always 1.
Although, if you take out following.id from group, the SQL doesn't work any more. It will crash with "a column must appear in GROUP BY clause...". This is a common issue in Postgres and this link (https://stackoverflow.com/a/19602031/2956135) explains the topic well in detail.
To solve your question, instead of using group, you can use COUNT OVER (PARTITION BY).
const user = await User.findOne({
where: {
id,
},
attributes: [
'id',
'userName',
'email',
[Sequelize.literal('COUNT("following->UserFollow"."followeeId") OVER (PARTITION BY "User"."id")'), 'followingCount']
],
include: [
{
model: User,
as: 'following',
attributes: ['id', 'userName', 'email'],
through: {
attributes: [],
}
},
],
});
======================================================
Update:
The original query only fetch "following" relationship. In order to fetch followers of this user, you first need to add "follower" association.
Then, since 2 associations is added, we need to add 1 more partition by column to count exactly the followers or followees.
const followeeIdCol = '"following->UserFollow"."followeeId"';
const followerIdCol = '"follower->UserFollow"."followerId"';
const user = await User.findOne({
where: {
id,
},
attributes: [
'id',
'userName',
'email',
// Note that the COUNT column and partition by column is reversed.
[Sequelize.literal(`COUNT(${followeeIdCol}) OVER (PARTITION BY "Users"."id", ${followerIdCol})`), 'followingCount'],
[Sequelize.literal(`COUNT(${followerIdCol}) OVER (PARTITION BY "Users"."id", ${followeeIdCol})`), 'followerCount'],
],
include: [
{
model: User,
as: 'following',
attributes: ['id', 'userName', 'email'],
through: {
attributes: [],
}
},
{
model: User,
as: 'follower', // Add follower association
attributes: ['id', 'userName', 'email'],
through: {
attributes: [],
}
},
],
});
I'm unable to figure out how to construct a graphql query for performing the mongodb fulltext search using the text index. https://docs.mongodb.com/manual/text-search/
I've already created a text index on my string in the mongoose schema but I don't see anything in the schemas that show up in the grapqhl playground.
A bit late, though I was able to implement it like so
const FacilitySchema: Schema = new Schema(
{
name: { type: String, required: true, maxlength: 50, text: true },
short_description: { type: String, required: true, maxlength: 150, text: true },
description: { type: String, maxlength: 1000 },
location: { type: LocationSchema, required: true },
},
{
timestamps: true,
}
);
FacilitySchema.index(
{
name: 'text',
short_description: 'text',
'category.name': 'text',
'location.address': 'text',
'location.city': 'text',
'location.state': 'text',
'location.country': 'text',
},
{
name: 'FacilitiesTextIndex',
default_language: 'english',
weights: {
name: 10,
short_description: 5,
// rest fields get weight equals to 1
},
}
);
After creating your ObjectTypeComposer for the model, add this
const paginationResolver = FacilityTC.getResolver('pagination').addFilterArg({
name: 'search',
type: 'String',
query: (query, value, resolveParams) => {
resolveParams.args.sort = {
score: { $meta: 'textScore' },
};
query.$text = { $search: value, $language: 'en' };
resolveParams.projection.score = { $meta: 'textScore' };
},
});
FacilityTC.setResolver('pagination', paginationResolver);
Then you can assign like so
const schemaComposer = new SchemaComposer();
schemaComposer.Query.addFields({
// ...
facilities: Facility.getResolver('pagination')
// ...
});
On your client side, perform the query like so
{
facilities(filter: { search: "akure" }) {
count
items {
name
}
}
}
I created the following two models...
const Account = sequelize.define("account",
{
id_account: {
type: Sequelize.INTEGER.UNSIGNED,
primaryKey: true,
autoIncrement: true
},
name: {...},
surname: {...},
username: {...},
password: {...}
},
{
name: {
singular: "Account",
plural: "Accounts"
},
freezeTableName: true,
hooks: {
beforeSave: ((account, options) => {
return bcrypt.hash(account.password, 10)
.then(hash => {account.password = hash;})
.catch(err => {throw new Error();});
})
}
});
const Genre = sequelize.define("genre",
{
genre_name: {
type: Sequelize.STRING(40),
primaryKey: true
},
url_img: {
type: Sequelize.STRING(40),
allowNull: false
}
},
{
name: {
singular: "Genre",
plural: "Genres"
},
freezeTableName: true
});
...and the following associations
Account.Genres = Account.belongsToMany(Genre, {
through: "AccountGenre",
foreignKey: "ref_account"
});
Genre.Accounts = Genere.belongsToMany(Account, {
through: "AccountGenre",
foreignKey: "ref_genre"
});
I created the following genres: Rock, Metal, Pop, Hardcore.
Now i want to create an Account and associate it 3 genres.
The following code creates the Account but doesn't create the association with the existing genres in the AccountGenre table:
const genresArray = ["Rock", "Metal", "Pop"];
const account = {...} // I have an object with account properties
Account.create({
name: account.name,
surname: account.cognome,
username: account.nome_utente,
password: account.password,
genres: genresArray
}, {
include: [Genre]
});
What's wrong in this code?
The problem here is that you gave the reference to the
association the plural name “Genres”. You need the same in the include statement.
include: [Genres]
I want to do this:
select sum("quantity") as "sum"
from "orderArticles"
inner join "orders"
on "orderArticles"."orderId"="orders"."id"
and "orderArticles"."discountTagId" = 2
and "orders"."paid" is not null;
which results in on my data base:
sum
-----
151
(1 row)
How can I do it?
My Sequelize solution:
The model definitions:
const order = Conn.define('orders', {
id: {
type: Sequelize.BIGINT,
autoIncrement: true,
primaryKey: true
},
// ...
paid: {
type: Sequelize.DATE,
defaultValue: null
},
// ...
},
// ...
})
const orderArticle = Conn.define('orderArticles',
{
id: {
type: Sequelize.BIGINT,
autoIncrement: true,
primaryKey: true
},
// ...
quantity: {
type: Sequelize.INTEGER,
defaultValue: 1
}
},
{
scopes: {
paidOrders: {
include: [
{ model: order, where: { paid: {$ne: null}} }
]
}
},
// ...
})
Associations:
orderArticle.belongsTo(order)
order.hasMany(orderArticle, {onDelete: 'cascade', hooks: true})
I came up with this after hours of research:
db.models.orderArticles
.scope('paidOrders') // select only orders with paid: {$ne: null}
.sum('quantity', { // sum up all resulting quantities
attributes: ['quantity'], // select only the orderArticles.quantity col
where: {discountTagId: 2}, // where orderArticles.discountTagId = 2
group: ['"order"."id"', '"orderArticles"."quantity"'] // don't know why, but Sequelize told me to
})
.then(sum => sum) // return the sum
leads to this sql:
SELECT "orderArticles"."quantity", sum("quantity") AS "sum",
"order"."id" AS "order.id", "order"."taxRate" AS "order.taxRate",
"order"."shippingCosts" AS "order.shippingCosts", "order"."discount"
AS "order.discount", "order"."paid" AS "order.paid",
"order"."dispatched" AS "order.dispatched", "order"."payday" AS
"order.payday", "order"."billNr" AS "order.billNr",
"order"."createdAt" AS "order.createdAt", "order"."updatedAt" AS
"order.updatedAt", "order"."orderCustomerId" AS
"order.orderCustomerId", "order"."billCustomerId" AS
"order.billCustomerId" FROM "orderArticles" AS "orderArticles" INNER
JOIN "orders" AS "order" ON "orderArticles"."orderId" = "order"."id"
AND "order"."paid" IS NOT NULL WHERE "orderArticles"."discountTagId" =
'4' GROUP BY "order"."id", "orderArticles"."quantity";
which has this result on the same data base: 0 rows
If you know what I got wrong please let me know!
Thank you :)
Found the solution:
in the scopes definition on the orderArticle model:
scopes: {
paidOrders: {
include: [{
model: order,
where: { paid: {$ne: null}},
attributes: [] // don't select additional colums!
}]
}
},
//...
and the algorithm:
db.models.orderArticles
.scope('paidOrders')
.sum('quantity', {
attributes: [], // don't select any further cols
where: {discountTagId: 2}
})
Note: In my case it was sufficient to return the promise. I use GraphQL which resolves the result and sends it to the client.
I'm new to Sails.js (v0.10.5) and Waterline ORM. I have 3 tables in database: users (id, name), roles(id, alias) and join table users_roles(user_id, role_id). It's important not to change table names and field names in database. I want Policy entity to be a join entity between User and Role. Here is some mapping code:
//User.js
module.exports = {
tableName: 'users',
autoCreatedAt: false,
autoUpdatedAt: false,
attributes: {
id: {
type: 'integer',
required: true
},
name: {
type: 'string'
},
roles: {
collection: 'role',
via: 'users',
through: 'policy'
},
}
}
//Role.js
module.exports = {
tableName: "roles",
autoCreatedAt: false,
autoUpdatedAt: false,
attributes: {
id: {
type: 'integer',
required: true
},
alias: {
type: 'string',
required: true
},
users: {
collection: 'user',
via: 'roles',
through: 'policy'
}
}
}
//Policy.js
module.exports = {
tableName: "users_roles",
tables: ['users', 'roles'],
junctionTable: true,
autoCreatedAt: false,
autoUpdatedAt: false,
attributes: {
user: {
columnName: 'user',
type: 'integer',
foreignKey: true,
references: 'user',
on: 'id',
via: 'role',
groupBy: 'user'
},
roles: {
columnName: 'role',
type: 'integer',
foreignKey: true,
references: 'role',
on: 'id',
via: 'user',
groupBy: 'role'
}
}
}
But when I trying to access roles atribute in controller
User.findOne({id: 1}).populate('roles').exec(function(err, user) {
console.log(JSON.stringify(user.roles));
});
this returns
[]
And
User.findOne({id: 1}).populate('roles').exec(function(err, user) {
console.log(JSON.stringify(user));
});
returns
{"id":1,"name":"test", "roles":[]}
I checked twice that user, role and association between them exists in database. What is my mistake?
I have found way to solve this problem. It's not what I exactly want, but it works.
First: join entity:
//Policy.js
module.exports = {
tableName: "users_roles",
autoPK: false,
attributes: {
id: {
type: 'integer',
primaryKey: true,
autoIncrement: true,
},
user: {
columnName: 'user_id',
model: 'user'
},
role: {
columnName: 'role_id',
model: 'role'
}
},
//tricky method to get all users for specified role_id
//or to get all roles for specified user_id
get: function(id, modificator, cb) {
var fields = ['user', 'role'];
if (fields.indexOf(modificator) < 0) {
cb(new Error('No such modificator in Policy.get()'), null);
}
var inversedField = fields[(fields.indexOf(modificator) + 1) % 2];
var condition = {};
condition[inversedField] = id;
this.find(condition).populate(modificator).exec(function(err, policies) {
if (err) {
cb(err, null);
return;
}
var result = [];
policies.forEach(function(policy) {
result.push(policy[modificator]);
});
cb(null, result);
return;
});
}
}
As you see, I added ID field to this entity (and to db table users_roles too), so it's not the great solution.
//User.js
module.exports = {
tableName: 'users',
autoPK: false,
attributes: {
id: {
type: 'integer',
primaryKey: true,
autoIncrement: true,
unique: true,
},
name: {
type: 'string'
},
policies: {
collection: 'policy',
via: 'user'
}
}
}
And Role Entity:
//Role.js
module.exports = {
tableName: 'roles',
autoPK: false,
attributes: {
id: {
type: 'integer',
primaryKey: true,
autoIncrement: true,
},
alias: {
type: 'string',
required: true,
unique: true,
},
policies: {
collection: 'policy',
via: 'role'
}
}
}
That's how I get all roles for specified user_id:
...
id = req.session.me.id; //user_id here
Policy.get(id, 'role', function(err, roles) {
var isAdmin = false;
roles.forEach(function(role) {
isAdmin |= (role.id === 1);
});
if (isAdmin) {
next(null);
return;
} else {
return res.redirect('/login');
}
});
...
Maybe it'll be usefull for somebody =)