I want to get objects from table providing id, which is in relation with table, which is in another relation. It looks like this:
Hand is in relation manyToOne with Action (hand can have only one action),
Action is in relation manyToOne with Situation (action can have only one situation)
I'm trying to make GET request for hands in which I'm providing situationId.
Simplified entities:
#Entity()
export class Hand {
#PrimaryGeneratedColumn()
hand_id: number;
#Column()
hand: string;
#ManyToOne(type => Action, action => action.simplifiedhands, { eager: true, onDelete: 'CASCADE', onUpdate: 'CASCADE' })
action: Action;
}
#Entity()
export class Action {
#PrimaryColumn()
action_id: number;
#ManyToOne(type => Situation, situation => situation.actions, { onDelete: 'CASCADE', onUpdate: 'CASCADE' })
#JoinColumn({name: 'situation'})
situation: Situation;
#OneToMany(type => Hand, hand => hand.action)
hands: Hand[];
#OneToMany(type => Hand, hand => hand.action)
hands: Hand[];
}
#Entity()
export class Situation {
#PrimaryColumn()
situation_id: number;
#ManyToOne(type => Strategy, strategy => strategy.situations, { onDelete: 'CASCADE', onUpdate: 'CASCADE' })
strategy: Strategy;
#OneToMany(type => Action, action => action.situation)
actions: Action[];
}
What approaches didn't work for me so far (just example variants):
return await this.handsRepository.find({
relations: ["action", "action.situation"],
where: {
"situation": id
}
});
and
return await this.handsRepository.find({
join: {
alias: "hands",
leftJoinAndSelect: {
"action": "hand.action",
"situation": "action.situation"
}
},
where: {
"situation": id
}
});
Generally both 'works' but provide all the records, like there were no where condition.
The keys in the object you assign to where should be members of the entity of the repository, in your case Hand, since situation is a member of action it's not working. I'm surprised you didn't mention any errors.
You can do one of the following (example for postgres)
Using query builder:
return await this.handsRepository.createQueryBuilder(Hand, 'hand')
.leftJoin('hand.action', 'action')
.leftJoin('action.situation', 'situation')
.where('situation.id = :id', { id })
.getMany();
Or, you can try the following (success is not guaranteed):
return await this.handsRepository.find({
relations: ["action", "action.situation"],
where: {
action: {
situation: { id }
}
}
});
Related
I have a project written by nestjs and typeorm. In my project I have tables chat and user so I want to get ManyToOne relationships. Here is the chat table
export class Chat extends BaseEntity {
#PrimaryGeneratedColumn()
id: number;
#ManyToOne(() => User, (user) => user.chatsCreater, { nullable: false })
#JoinColumn({ name: 'creatorId' })
creator: User;
#ManyToOne(() => User, (user) => user.chatsCompanion, { nullable: false })
#JoinColumn({ name: 'companionId' })
companion: User;
}
and chunk from user table
...
#OneToMany(() => Chat, (chat) => chat.creator)
chatsCreater: Chat[];
#OneToMany(() => Chat, (chat) => chat.companion)
chatsCompanion: Chat[];
...
When I query data from chat I expect to get the hole table {id, companionId, creatorI} not only value of chat.id. Here is my query
.createQueryBuilder('chat')
.where('chat.creatorId = :creatorId AND chat.companionId = :companionId', { creatorId, companionId })
.getOne()
and the result {id: 1}
So what I want is to get values of companionId and creatorId too when I query from chat.
If I change getOne() to getRaw() I get the desired output. But in case of more complex queries (with multiple joins) it becomes a mess with getRaw so is there a way to get all columns using getOne ?
I was able to do it by using leftJoinAndSelect
.createQueryBuilder('chat')
.leftJoinAndSelect('chat.creator', 'creator')
.leftJoinAndSelect('chat.companion', 'companion')
.where('chat.creatorId = :creatorId AND chat.companionId = :companionId', { creatorId, companionId })
.getOne();
In case if hole table is not needed it's also possible to use leftJoin without select and later add to query addSelect(['creator.id','companion.id'])
I'm developing a small e-commerce to sell cinema tickets. I'm using Sequelize to design all models and their associations. The issue I'm facing is related with the route defined to create the final order:
Order.create({
userId: req.body.userId, // Number
sessionId: req.body.sessionId, // Number
seats: req.body.seats, // Array of objects
offsiteProducts: req.body.offsiteProducts // Array of objects
},
{
include: [
{
model: Seat,
attributes: ['area', 'number', 'roomId']
},
{
model: OffsiteProduct,
attributes: ['name', 'unitPrice']
}
]
}).then(order => {
res.json(order);
})
The relation between models is as follows:
User.hasMany(Order);
Order.belongsTo(User);
Session.hasMany(Order);
Order.belongsTo(Session);
Seat.belongsToMany(Order, { through: "reserved_seats" });
Order.belongsToMany(Seat, { through: "reserved_seats" });
OffsiteProduct.belongsToMany(Order, { through: ReservedOffsiteProduct });
Order.belongsToMany(OffsiteProduct, { through: ReservedOffsiteProduct });
For the "one-to-many" relationships, passing a foreign key is enough for Sequelize to associate models properly.
But for "many-to-many" associations ("belongsToMany" in Sequelize) it would duplicate the data entered for seats and offsite products and create it both as part of the order and as a new independent seat and offsite product respectively.
How can I avoid this behaviour and include the arrays of seats and offsite products only inside the final order? Thanks.
One way to do this is to execute everything in a transaction. That way, it will be atomic, i.e. "all or nothing".
Sequelize provides some methods for many-to-many associations. In this case, a separate call could be made for each junction table.
With this in mind, the following should accomplish the inserts without any duplicates:
let t = await sequelize.transaction()
try {
let order = await Order.create({
userId: req.body.userId,
sessionId: req.body.sessionId
}, {
transaction: t
})
let seats = await Seat.findAll({
where: {
id: {
[Op.in]: req.body.seatIds
}
}
})
let offsiteProducts = await OffsiteProducts.findAll({
where: {
id: {
[Op.in]: req.body.offsiteProductIds
}
}
})
await order.addSeats(seats, { transaction: t })
await order.addOffsiteProducts(offsiteProducts, { transaction: t })
await t.commit()
} catch (err) {
if (t) {
await t.rollback()
}
}
Alternatively, if the primary keys for the rows in the OffsiteProducts and Seats tables are already known, the above could be shortened to:
let t = await sequelize.transaction()
try {
let order = await Order.create({
userId: req.body.userId,
sessionId: req.body.sessionId
}, {
transaction: t
})
await order.addSeats(req.body.seatIds, { transaction: t })
await order.addOffsiteProducts(req.body.offsiteProductIds, { transaction: t })
await t.commit()
} catch (err) {
if (t) {
await t.rollback()
}
}
There's a bit more explanation for passing arrays of primary keys to the .addSeats and .addOffsiteProducts methods in the docs here.
I'm attempting to set up my User GraphQL model to have followers and following attributes to query on. However I'm having trouble setting up the relationship in Sequelize. I'm trying to use a Follower model as a Join Table and setup a BelongsToMany association, but haven't been able to get it working. Can anyone suggest what to do or point out what I'm doing wrong?
I've come up with a temporary solution by manually querying, which you can see in my User.model.ts, but I believe there is a better way to do it using proper configuration.
I'm using typescript wrappers around GraphQL and Sequelize, TypeGraphQL and sequelize-typescript respectively, as well as PostgreSQL.
User.model.ts
// VENDOR
import { ObjectType, Field, ID } from 'type-graphql';
import { Model, Table, Column, PrimaryKey, Unique, IsUUID, HasMany, DefaultScope, AllowNull, DataType, BelongsToMany } from 'sequelize-typescript';
// APP
import Post from '../post/post.types';
import Follower from '../follower/follower.types';
/** User model for GraphQL & Database */
#Table({ timestamps: false, tableName: 'users' }) // tell sequelize to treat class as table model
#DefaultScope(() => ({ include: [{ model: Post.scope(), as: 'posts' }] })) // tell sequelize to include posts in its default queries
#ObjectType() // tell GraphQL to treat class as GraphQL model
export default class User extends Model<User>{
#PrimaryKey
#Unique
#AllowNull(false)
#IsUUID(4)
#Column(DataType.UUID)
#Field(() => ID)
id: string;
#Unique
#AllowNull(false)
#Column
#Field()
ci_username: string;
#AllowNull(false)
#Column
#Field()
username: string;
#AllowNull(false)
#Column
#Field()
first_name: string;
#Column
#Field()
last_name: string;
#Column
#Field({ nullable: true })
profile_picture?: string;
// #BelongsToMany(() => User, { otherKey: 'user_id', as: 'followers', through: () => Follower })
// #Field(() => [User])
// followers: User[];
// MY TEMPORARY SOLUTION USING MANUAL QUERYING
#Field(() => [User])
get followers(): Promise<User[]> {
return Follower.findAll({ where: { user_id: this.id } })
.then(records => records.map(record => record.follower_id))
.then((follower_ids: string[]) => {
return User.findAll({ where: { id: follower_ids }});
})
}
// DOES NOT WORK, BUT I BELIEVE COULD POTENTIALLY LEAD TO BETTER SOLUTION
#BelongsToMany(() => User, { otherKey: 'follower_id', as: 'following', through: () => Follower })
#Field(() => [User])
following: User[];
#HasMany(() => Post)
#Field(() => [Post])
posts: Post[];
}
Follower.model.ts
// VENDOR
import { Model, Table, Column, PrimaryKey, Unique, IsUUID, AllowNull, DataType, Index, ForeignKey, AutoIncrement } from 'sequelize-typescript';
// APP
import User from '../user/user.types';
/** Follower model for Database */
#Table({ timestamps: false, tableName: 'followers' }) // tell sequelize to treat class as table model
export default class Follower extends Model<Follower>{
#PrimaryKey
#AutoIncrement
#Unique
#AllowNull(false)
#Column
id: number;
#AllowNull(false)
#IsUUID(4)
#Index
#ForeignKey(() => User)
#Column(DataType.UUID)
user_id: string;
#AllowNull(false)
#IsUUID(4)
#Index
#ForeignKey(() => User)
#Column(DataType.UUID)
follower_id: string;
}
GraphQL Query
{
users: allUsers {
id
username
first_name
last_name
following {
username
id
}
}
}
GraphQL Response / Error
{
"errors": [
{
"message": "Cannot return null for non-nullable field User.following.",
"locations": [
{
"line": 7,
"column": 5
}
],
"path": [
"users",
0,
"following"
],
"extensions": {
"code": "INTERNAL_SERVER_ERROR",
"exception": {
"stacktrace": [
"Error: Cannot return null for non-nullable field User.following.",
" at completeValue (/Users/jsainz237/Projects/trueview/trueview-api/node_modules/graphql/execution/execute.js:560:13)",
" at /Users/jsainz237/Projects/trueview/trueview-api/node_modules/graphql/execution/execute.js:492:16"
]
}
}
}
],
"data": null
}
Any help is appreciated.
You need to write a #FieldResolver manually that will resolve the relation and return proper data.
Another solution is to rely on ORM capabilities and lazy relations - when the returned base entity contains a promise as a field, so when .then() is called, it automatically fetches the relation for the database.
I'm struggling to create a query with sequelize.
Some context
I have the following models:
A Manifestation can have [0..n] Event
An Event belongs to one Manifestation (an Event cannot exist without a Manifestation)
A Place can have [0..n] Event
An Event belongs to one Place (an Event cannot exist without a Place)
A Manifestation can have [1..n] Place
A Place can have [0..n] Manifestation
I model the relations as the following:
Manifestation.hasMany(Event, { onDelete: 'CASCADE', hooks: true })
Event.belongsTo(Manifestation)
Place.hasMany(Event, { onDelete: 'CASCADE', hooks: true })
Event.belongsTo(Place)
Manifestation.belongsToMany(Place, { through: 'manifestation_place' })
Place.belongsToMany(Manifestation, { through: 'manifestation_place' })
For me it seems rather correct, but don't hesitate if you have remarks.
The question
I'm trying to query the Place in order to get all Manifestation and Event happening in a given Place. But for the Event ones, I want to include them within their Manifestation even if the Manifestation doesn't happen in the given Place.
Below is the "JSON" structure I'm trying to achieve:
{
id: 1,
name: "Place Name",
address: "Place address",
latitude: 47.00000,
longitude: -1.540000,
manifestations: [
{
id: 10,
title: "Manifestation one",
placeId: 1,
events: []
},
{
id: 11,
title: "Manifestation two",
placeId: 3,
events: [
id: 5,
title: "3333",
manifestationId: 11,
placeId: 1
]
}
]
}
So I want to include the Manifestation with id: 11, because one of its Event occurs in the given Place (with id: 1)
Update (04/06/20): For now I rely on javascript to get the expected result
I figured out it would be nice if I posted my current solution before asking.
router.get('/test', async (req, res) => {
try {
const placesPromise = place.findAll()
const manifestationsPromise = manifestation.findAll({
include: [
{ model: event },
{
model: place,
attributes: ['id'],
},
],
})
const [places, untransformedManifestations] = await Promise.all([
placesPromise,
manifestationsPromise,
])
const manifestations = untransformedManifestations.map(m => {
const values = m.toJSON()
const places = values.places.map(p => p.id)
return { ...values, places }
})
const result = places
.map(p => {
const values = p.toJSON()
const relatedManifestations = manifestations
.filter(m => {
const eventsPlaceId = m.events.map(e => e.placeId)
return (
m.places.includes(values.id) ||
eventsPlaceId.includes(values.id)
)
})
.map(m => {
const filteredEvents = m.events.filter(
e => e.placeId === values.id
)
return { ...m, events: filteredEvents }
})
return { ...values, manifestations: relatedManifestations }
})
.filter(p => p.manifestations.length)
return res.status(200).json(result)
} catch (err) {
console.log(err)
return res.status(500).send()
}
})
But I'm pretty sure I could do that directly with sequelize. Any ideas or recommendations ?
Thanks
This is not optimum. But you can try it out:
const findPlace = (id) => {
return new Promise(resolve => {
db.Place.findOne({
where: {
id: id
}
}).then(place => {
db.Manefestation.findAll({
include: [{
model: db.Event,
where: {
placeId: id
}
}]
}).then(manifestations => {
const out = Object.assign({}, {
id: place.id,
name: place.name,
address: place.address,
latitude: place.latitude,
longitude: place.longitude,
manifestations: manifestations.reduce((res, manifestation) => {
if (manifestation.placeId === place.id || manifestation.Event.length > 0) {
res.push({
id: manifestation.id,
title: manifestation.id,
placeId: manifestation.placeId,
events: manifestation.Event
})
}
return res;
}, [])
})
})
resolve(out);
})
})
}
From this, you get all manifestations that assigned to place or have any event that assigns. All included events in the manefestations are assigned to the place.
Edit :
You will be able to use the following one too:
const findPlace = (id) => {
return new Promise(resolve => {
db.Place.findOne({
include: [{
model: db.Manefestation,
include: [{
model: db.Event,
where: {
placeId: id
}
}]
}],
where: {
id: id
}
}).then(place => {
db.Manefestation.findAll({
include: [{
model: db.Event,
where: {
placeId: id
}
}],
where: {
placeId: {
$not: id
}
}
}).then(manifestations => {
place.Manefestation = place.Manefestation.concat(manifestations.filter(m=>m.Event.length>0))
resolve(place);// or you can rename, reassign keys here
})
})
})
}
Here I take only direct manifestations in the first query. Then, manifestations that not included and concatenate.
I do not know if you figure it out by now. But the solution is provided below.
Search with Sequelize could get funny :). You have to include inside another include. If the query gets slow use separate:true.
Place.findAll({
include: [
{
model: Manifestation,
attributes: ['id'],
include: [{
model: Event ,
attributes: ['id']
}]
},
],
})
I tried to complete it in a single query but you will still need JavaScript to be able to get the type of output that you want.
(Note: 💡 You need manifestation which is not connected to places but should be included if a event is present of that place. The only SQL way to get that starts by doing a CROSS JOIN between all tables and then filtering out the results which will be a very hefty query)
I came up with this code(tried & executed) which doesn't need you to execute 2 findAll that fetches all data as what you are currently using. Instead it fetched only the data needed for final output in 1 query.
const places = await Place.findAll({
include: [{
model: Manifestation,
// attributes: ['id']
through: {
attributes: [], // this helps not get keys/data of join table
},
}, {
model: Event,
include: [{
model: Manifestation,
// attributes: ['id']
}],
}
],
});
console.log('original output places:', JSON.stringify(places, null, 2));
const result = places.map(p => {
// destructuring to separate out place, manifestation, event object keys
const {
manifestations,
events,
...placeData
} = p.toJSON();
// building modified manifestation with events array
const _manifestations = manifestations.map(m => {
return ({ ...m, events: [] })
});
// going through places->events to push them to respective manifestation events array
// + add manifestation which is not directly associated to place but event is of that manifestation
events.map(e => {
const {
manifestation: e_manifestation, // renaming variable
...eventData
} = e;
const mIndex = _manifestations.findIndex(m1 => m1.id === e.manifestationId)
if (mIndex === -1) { // if manifestation not found add it with the events array
_manifestations.push({ ...e_manifestation, events: [eventData] });
} else { // if found push it into events array
_manifestations[mIndex].events.push(eventData);
}
});
// returning a place object with manifestations array that contains events array
return ({ ...placeData, manifestations: _manifestations });
})
// filter `.filter(p => p.manifestations.length)` as used in your question
console.log('modified places', JSON.stringify(result, null, 2));
I am using Nestjs with Typeorm and Mysql, and I can't figure out a good way to filter entries by their many to many relation.
I have these 2 entities:
Group Entity:
#Entity({ name: 'groups' })
export class Group {
#ManyToMany(() => Tag, { eager: true })
#JoinTable()
tags: Tag[];
}
Tag Entity
#Entity({ name: 'tags' })
export class Tag {
#Column()
#Index({ unique: true })
tag?: string;
}
And would like to search all groups that have a tag with a specific text.
ie. all groups that have the tag.tag "sport"
Tried this code:
const args = {
where: [
{
'tags': In([Like(`%sport%`)]),
}
],
relations: ['tags'], // TAGS
take: filter.take,
skip: filter.skip,
order: filter.order
};
return super.findAll(args);
but it doesn't seem to work..
any help would be great!
return find({
where: {
tags: {
tag: Like(`%sport%`),
},
},
relations: ['tags'],
});
Almost, typeorm accepts an ObjectLiteral or keyof typeof Tags from relations like so:
FindConditions<T>: {
where: {
[s: keyof typeof T]: any,
},
}
That's not quite it but that's the general gist. And if the keyof T is a relation then any is replaced with keyof relation pretty much anyway.
This is the full type for findConditions https://github.com/typeorm/typeorm/blob/master/src/find-options/FindConditions.ts