Sequelize inner join between 2 tables from 2 different databases - mysql

Question

I'm currently trying to do an inner join between two tables:
The first one is in a database called SmartMonument while the second one is in a database called SmartMonumentCB.
Here is the code for the init of those table:
In 'database.js' (referring to SmartMonument):
const CompaniesForClient=sequelize.define('cfc', {
scrapperName: {type: Sequelize.STRING, allowNull: false},
clientID: {type: Sequelize.INTEGER(10), allowNull: false}
});
CompaniesForClient.sync();
module.exports = { sequelize, CompaniesForClient };
The second table is :
const Companies = sequelize.define('companies', {
scrapperName: {type: Sequelize.STRING, allowNull: false},
scrapperAddress: {type: Sequelize.STRING(500)}
});
Companies.sync();
module.exports = {sequelize, Companies};
Both tables are well created and then I try to add something so both tables are related on the scrapperName field.
I try to do it like such:
CompaniesForClient.hasOne(CompaniesDB.Companies, {foreignKey: 'scrapperName'});
My goal is ultimatly to be able to read all the CompaniesForClient fields with all the fields of Companies in one request like such:
CompaniesForClient.findAll({where:{clientID: param}, include: [{model: Companies}];
Right now I get the following error :
Unhandled rejection SequelizeDatabaseError: Cannot add foreign key constraint
at Query.formatError(/home/ubuntu/backendDev/node_modules/sequelize/lib/dialects/mysql/query.js:222:16)
at Query.connection.query [as onResult] (/home/ubuntu/backendDev/node_modules/sequelize/lib/dialects/mysql/query.js:55:23)
at Query.Command.execute (/home/ubuntu/backendDev/node_modules/mysql2/lib/commands/command.js:30:12)
at Connection.handlePacket (/home/ubuntu/backendDev/node_modules/mysql2/lib/connection.js:515:28)
at PacketParser.onPacket (/home/ubuntu/backendDev/node_modules/mysql2/lib/connection.js:94:16)
at PacketParser.executeStart (/home/ubuntu/backendDev/node_modules/mysql2/lib/packet_parser.js:77:14)
at Socket.<anonymous> (/home/ubuntu/backendDev/node_modules/mysql2/lib/connection.js:102:29)
at emitOne (events.js:115:13)
at Socket.emit (events.js:210:7)
at addChunk (_stream_readable.js:266:12)
at readableAddChunk (_stream_readable.js:253:11)
at Socket.Readable.push (_stream_readable.js:211:10)
at TCP.onread (net.js:585:20)

Answer 1

Make sure that your foreign key (if not primary) is unique and also check if the data in your database is matching with the data from the table that you are going to associate it with (of course in the foreign key column)