I have two models defined in GraphQL Cars and Brands (their association is cars.brand_id = brands.id).
The schema only works when I define:
Cars.hasMany(models.brands, {
sourceKey: 'brand_id',
foreignKey: 'id'
})
Whereas it doesn't work if I define it in the following way:
Cars.hasOne(models.brands, {
sourceKey: 'brand_id',
foreignKey: 'id'
}),
Here I share a bit more of the schema (I am using makeExecutableSchema to split the files definitions):
Associations:
CarBrands.js
CarBrands.associate = models => {
CarBrands.hasOne(models.cars, {
foreignKey: 'brand_id',
});
}
Cars.js
Cars.associate = models => {
Cars.belongsTo(models.brands),
Cars.hasMany(models.car_images, {
foreignKey: {
name: 'car_id',
allowNull: false
},
onDelete: "cascade"
});
};
Car Model:
export const typeDef = `
type Cars {
user_id: Int!,
title: String!,
brands: [CarBrands!],
car_images: [CarImages],
}
`;
The SQL is well-formed, and car_images returns the data correctly whereas brands does not. Any idea why is that?
Any hint will be forever appreciated.
Thanks
You can find the document one-to-one-relationships at there: https://sequelize.org/master/manual/assocs.html#one-to-one-relationships
.In the document introduces 4 options to define one-to-one.
Try it:
Brands.hasOne(Cars, {
foreignKey: 'brand_id'
});
Cars.belongsTo(Brands);
Related
I have the following 2 tables in node.js:
users
'use strict'
let Sequelize = require('sequelize');
let dbConnection = require('../connection.js');
let users = dbConnection.connection.define('users', {
//user table detail
}, {
classMethods: {associate: function (models) {
// associations can be defined here
users.hasMany(models.chat_histories, {foreignKey: 'sender_id'});
users.hasMany(models.chat_histories, {foreignKey: 'receiver_id'});
}}
}, {
timestamps: false
});
module.exports = users;
chat_histories
'use strict'
let Sequelize = require('sequelize');
let dbConnection = require('../connection.js');
let chat_histories = dbConnection.connection.define(
'chat_histories', {
//chat_history detail
link_id: {
type: Sequelize.STRING(64),
references: 'links', // <<< Note, its table's name, not object name
referencesKey: 'id' // <<< Note, its a column name
},
sender_id: {
type: Sequelize.BIGINT,
references: 'users', // <<< Note, its table's name, not object name
referencesKey: 'id' // <<< Note, its a column name
},
receiver_id: {
type: Sequelize.BIGINT,
references: 'users', // <<< Note, its table's name, not object name
referencesKey: 'id' // <<< Note, its a column name
}
},
{
classMethods: {associate: function (models) {
// associations can be defined here
chat_histories.belongsTo(models.users, {foreignKey: 'sender_id'});
chat_histories.belongsTo(models.users, {foreignKey: 'receiver_id'});
chat_histories.belongsTo(models.links, {foreignKey: 'link_id' });
}}
}, {
timestamps: false
}
);
module.exports = chat_histories;
However, every time when I do query in chat_history table I have the following error message:
SequelizeEagerLoadingError: chat_histories is not associated to users!
Is there anything wrong?
I can see myself have already associated chat_historeis with users table via adding the following in chat_histories.js
classMethods: {associate: function (models) {
// associations can be defined here
chat_histories.belongsTo(models.users, {foreignKey: 'sender_id'});
chat_histories.belongsTo(models.users, {foreignKey: 'receiver_id'});
chat_histories.belongsTo(models.links, {foreignKey: 'link_id' });
}}
And added the following in user.js
classMethods: {associate: function (models) {
// associations can be defined here
users.hasMany(models.chat_histories, {foreignKey: 'sender_id'});
users.hasMany(models.chat_histories, {foreignKey: 'receiver_id'});
users.hasMany(models.links, {foreignKey: 'owner_id'});
}}
At the following is how I do search for SQL statement:
select distinct users from users, chat_histories where (users.id =
chat_histories.sender_id or users.id = chat_histories.receiver_id) and
chat_histories.link_id = :link_id;
let chat_histories = model.chat_histories;
let users = model.users;
let usersList;
const Op = Sequelize.Op;
await users.findAll({
where: {
[Op.and]: [
{
[Op.or]:[
{id: chat_histories.sender_id},
{id: chat_histories.receiver_id}
]
},
{
link_id: link_id
}
],
},
include: [
{
model: chat_histories,
required: false
},
]
}).then(function(data) {
usersList = data;
});
You have not defined associations properly. Associations need to be created for both users and chat_histories table.
users.hasMany(models.chat_histories, { foreignKey: 'sender_id', as: 'chat_histories' });
chat_histories.belongsTo(models.users, { foreignKey: 'sender_id', as: 'user' });
I have never used keywords like references and referencesKey in Sequelize models to define associations. I neither find any reference for them in the documentation.
Hope it helps!
ok at the end I figured out that in the class where I want to do the query, I need to put the following code before doing the query
users.hasMany(chat_histories, {foreignKey: 'sender_id'});
The above code is defined in the class where I did the query instead of in ORM class
I'm using a NodeJS webservice to receive my database data. If I call the methode the first Time everything works as expected.
I want to receive all entries from my table with all associations with the following Code:
model.hasOne(devicemodel, {foreignKey: 'id',sourceKey:'deviceid'});
model.hasOne(usermodel, {as: 'client', foreignKey: 'id' ,sourceKey: 'clientid'});
model.hasOne(usermodel, {as: 'operator', foreignKey: 'id' ,sourceKey: 'operatorid'});
var rma = await model.findAll({
include: [devicemodel, {model: usermodel, as: 'client'}, {model: usermodel, as: 'operator'}],
where: {
itoakid: config.companyid
}
});
return callback(rma);
But at the second call I get the following error:
SequelizeAssociationError: You have used the alias client in two separate associations. Aliased associations must have unique aliases.
I'm using Sequelize Version 6.11.3
In case you need to define the associations in your route, you can check existing associations prior to define.
alternative way,
model.hasOne(devicemodel, {foreignKey: 'id',sourceKey:'deviceid'});
if( !model.hasAlias('client') ){
model.hasOne(usermodel, {as: 'client', foreignKey: 'id' ,sourceKey: 'clientid'});
}
if(!model.hasAlias('operator')){
model.hasOne(usermodel, {as: 'operator', foreignKey: 'id' ,sourceKey: 'operatorid'});
}
var rma = await model.findAll({
include: [devicemodel, {model: usermodel, as: 'client'}, {model: usermodel, as: 'operator'}],
where: {
itoakid: config.companyid
}
});
return callback(rma);
The best way, you should define associations once as #Samuel G mentioned
You are defining the associations every time the route is hit and your function executes.
Move the schema declaration out the route handler and place it after you define your schema:
class Model extends Sequelize.Model {}
Model.init({
id: {
primaryKey: true,
type: Sequelize.UUID
},
...
}, {
sequelize,
modelName: 'model'
});
sequelize.models.model.hasOne(...
In your route handler:
var rma = await sequelize.models.model.findAll({
include: [devicemodel, {model: sequelize.models.usermodel, as: 'client'},
here is link of my code . I am getting error in index.js in api-routes-index.js. getting error undefined map function
I guess here you have an error:
subcategories: products.subcategories.map(Subcategory => {
products is array, you can't get subcategories from array. Change it to this code:
subcategories: Product.subcategories.map(Subcategory => {
Many to many associations in sequilize.js
This will be helpful for you to solve the issue:
One product has many order
One order has many product
As a result of many to many we have junction table "orderproduct" which contains product_id and order_id.
// In product model
product.belongsToMany(order, {
through: 'orderproduct',
foreignKey: 'product_id'
});
// In order model
order.belongsToMany(product, {
through: 'orderproduct',
foreignKey: 'order_id'
});
// In oderproduct model
orderproduct.belongsTo(product, {
foreignKey: { name: 'product_id', allowNull: false }
});
orderproduct.belongsTo (order, {
foreignKey: { name: 'order_id', allowNull: false }
});
}
I am trying to setup many to many relationship in Sequelize for my Postgres tables using a tag (lookup) table. I was successful in setting up the relationship.
Now my lookup table, has an additional field which is a foreign key to another table. I want the data for that table to be included in my result set. This is where I am having hard time figuring out the syntax.
My models:
Models.user = sequelize.define('user', { //attributes});
Models.school = sequelize.define('school', { //attributes });
Models.role = sequelize.define('role', { //attributes });
Models.userSchools = sequelize.define('user_school', {
user_school_id: { type: Sequelize.INTEGER, primaryKey: true }
});
Models.user.belongsToMany(Models.school, { through: Models.userSchools, foreignKey: 'user_id', otherKey: 'school_id' });
Models.school.belongsToMany(Models.user, { through: Models.userSchools, foreignKey: 'school_id', otherKey: 'user_id' });
Models.userSchools.belongsTo(Models.role, { foreignKey: 'role_id' });
Working query: This query gives me all the users and their schools.
Models.user.findAll({
where: {
//condition
},
include: [Models.school]
})
Now I want to include the role for each schools. None of the below queries are working.
Models.user.findAll({
where: {
//conditions
},
include: [Models.schools, Models.role]
})
Above query is throwing an error saying role is not associated to user, which is expected.
Models.user.findAll({
where: {
//conditions
},
include: [Models.schools, {model: Models.userSchools, include: Models.role}]
})
This query is also throwing an error:
"userSchools is not associated to user".
Can any one help with syntax to how I can get the role information from the userSchools model?
Edit:
I have add a "through" condition which gets me the role_id but not the related role data.
Models.user.findAll({
where: {
//conditions
},
include: [{
model: Models.school,
as: 'schools',
through: {
attributes: ['role_id']
}
}]
})
I'm using sequelize.js for ORM, and I have some questions while I use it.
Models looks like this
var Keyword = db.define('keyword', {
name: db.STRING,
});
var KeywordSearchableMap = db.define('keyword_searchable_map', {
keyword_id: db.INTEGER,
searchable: db.STRING,
searchable_id: db.STRING,
score: db.STRING,
});
var Searchable = db.define('searchable') {
name: db.STRING,
});
Keyword.belongsToMany(Searchable, {
through: {
model: KeywordSearchableMap,
},
foreignKey: 'keyword_id'
});
Searchable.belongsToMany(Keyword, {
through: {
model: KeywordSearchableMap,
},
foreignKey: 'searchable_id'
});
And I want to get 'Searchable' things by Keyword.getSearchables() order by 'score' field in 'KeywordSearchableMap'
Is there any methods to get sorted searchable objects?