sequelizejs eager fetch many to many - mysql

Question

I am trying to fetch eager on a join table in Nodejs with Sequelizejs v3 .
So, 1 Tag can belong to Many Images, and Many Images can have multiple tags.
Tag 1 - > M ImageTag M < - 1 Image
I am getting Unhandled rejection Error: Tag is not associated to ImageDetails when i tried to excute a query.
function getImagesFromAlbum(albumid, callback, errCallback){
ImageDetails.findAll({where: { AlbumId: albumid }, include: [{model: Tag}]}).then((data) => {
return callback(data)
}).catch((err) => {
return errCallback(err)
})
}
The expected return result should be the data according to the albumid, with the assiociate tags for that image
Here are the relationship joining
ImageDetails.belongsToMany(Tag, { as: { singular: "tag", plural: "tags" }, through: { model: ImageTag, unique: false }, foreignKey: "ImageId"})
Tag.belongsToMany(ImageDetails, { as: { singular: "image", plural: "images" }, through: { model: ImageTag, unique: false }, foreignKey: "TagId"})
Here are the model designs
Tag Model
const model = {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true
},
name: {
type: Sequelize.STRING
}
}
const name = "Tag"
ImageTag model (Join Table)
const model = {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true
}
}
const name = "ImageTag"
ImageDetails model
import { Sequelize, db } from "../config/MySqlConfiguration"
const model = {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true
},
ImageLocation: {
type: Sequelize.STRING
},
originalName: {
type: Sequelize.STRING
}
}
const name = "ImageDetails"
*Note sequelize.define is purposely omitted.

Answer 1

When defining relation between models with use of alias (as) in the belongsToMany, you need to remember to include this alias when eager loading models, so your query would look as follows
ImageDetails.findAll({
where: { AlbumId: albumid },
include: [{ model: Tag, as: 'tags' }]
}).then((data) => {
return callback(data)
}).catch((err) => {
return errCallback(err)
});
And what is the AlbumId you want to perform query on? According to your models definition, the ImageDetails model does not have such a field.