All nested rows does not inserted in a table - node.js

Question

I want tree structure in my Categories table.
So I tried this:
Categories model looks like:
import * as Sequelize from 'sequelize';
export default class CategoriesModel extends Sequelize.Model {
static init(sequelize, DataTypes) {
return super.init({
name: {
type: DataTypes.STRING,
},
}, {
modelName: 'categories',
sequelize,
});
}
}
association in my CategoriesModel class looks like:
static associate({ Categories }) {
this.nestedCategories = this.hasMany(Categories, {
as: 'nestedCategories',
foreignKey: 'parentId',
});
}
and when i tried to insert rows, for example:
sequelize.sync({ force: true }).then(() => {
models.Categories.create({
name: 'parent',
nestedCategories: [
{
name: 'child 1',
},
{
name: 'child 2',
nestedCategories: [
{
name: 'child 3',
}
],
},
],
}, {
include: [models.Categories.nestedCategories]
}).then(cat => {
console.log(cat.toJSON());
})
});
result is:
{
id: 1,
name: 'parent',
nestedCategories:
[ { id: 2,
name: 'child 1',
parentId: 1,
updatedAt: 2019-02-05T08:39:45.655Z,
createdAt: 2019-02-05T08:39:45.655Z },
{ id: 3,
name: 'child 2',
parentId: 1,
updatedAt: 2019-02-05T08:39:45.657Z,
createdAt: 2019-02-05T08:39:45.657Z } ],
updatedAt: 2019-02-05T08:39:45.624Z,
createdAt: 2019-02-05T08:39:45.624Z,
parentId: null
}
child 3 does not inserted in a table.
I dont understand what i'm doing wrong...

Answer 1

You need to specify one include per nested category in order to make your request parsed correctly.
Here I made a function to do this recursively based on model you want to create:
function buildIncludeRecursive(model, includeTemplate) {
const include = Object.assign({}, includeTemplate);
let currInclude = include;
let currModel = model;
while(currModel[includeTemplate.as]){
currInclude.include = [Object.assign({}, includeTemplate)];
currInclude = currInclude.includes[0];
currModel = currModel[includeTemplate.as];
}
return include;
}
const model = {
name: 'parent',
nestedCategories: [
{ name: 'child 1' },
{
name: 'child 2',
nestedCategories: [
{ name: 'child 3' }
]
},
],
};
const includeTemplate = {
model: models.Categories,
as: 'nestedCategories'
};
model.categories.create(model, {
include: buildIncludeRecursive(model, includeTemplate)
});
Here's what your include is gonna be in this case:
{
model: models.Categories,
as: 'nestedCategories',
include: [
{
model: models.Categories,
as: 'nestedCategories'
}
]
}