Get hierarchical structure data nodejs - sequelizejs - mysql - mysql

Question

Here is table folders
id name isSub parentid status
------------------------------------------------------
1 Main Folder1 0 NULL 1
2 Main Folder2 0 NULL 1
3 Sub Main Fol2 1 2 1
4 Sub Main Fol2 1 3 1
5 Sub Main Fol1 1 1 1
6 Sub Main Fol1 1 1 1
7 Main Folder3 0 NULL 1
8 Sub Main Fol1 1 1 1
------------------------------------------------------
This is the table i used for getting hierarchical structure. I'm using nodejs - sequelizejs.
Here is my model
sequelize.define('Folders', {
id: {
type: Sequelize.INTEGER,
allowNull: false,
primaryKey: true,
autoIncrement: true
},
name: {
type: Sequelize.STRING(100),
allowNull: false,
validate: {
len: [1, 100]
}
},
isSub: {
type: Sequelize.ENUM(),
values: ['0', '1'],
allowNull: false,
defaultValue: '0'
},
parentid: {
type: Sequelize.INTEGER,
allowNull: true,
validate: {
isNumeric: true
}
},
status: {
type: Sequelize.ENUM(),
values: ['0', '1', '2'],
allowNull: false,
defaultValue: '1'
},
},
{
tableName: 'folders'
}
);
Folders.associate = function(models) {
models.Folders.hasMany(models.Folders, {
foreignKey: 'parentid',
as: 'children'
});
};
And my controller function to get the list
models.Folders.findAll({
where: {
isSub : 1,
status : '1',
},
include: [{
model: models.Folders,
as: 'children',
where: {
status: '1'
},
required: false
}],
required: false
}).then((data) => {
data.map((foldData) => {
return Object.assign({}, {
fid: foldData['id'],
fName: foldData['name'],
fisSub: (foldData['isSub'] === '1')? 'Yes': 'No',
subFolders:
foldData['children'].map((sfoldData, index) => {
return Object.assign({}, {
sfid: sfoldData['id'],
sfName: sfoldData['name'],
sisSubFold: (sfoldData['isSub']) === '1'? 'Yes': 'No',
})
}),
});
});
});
By above code I'm getting the result in API calls as below
[
{
"fid": "2",
"fName": "Main Folder2",
"fisSub": "No",
"subCategory": [
{
"sfid": "3",
"sfName": "Sub Main Fol2",
"sisSubFold": "Yes"
}
]
},
{
"fid": "1",
"fName": "Main Folder1",
"fisSub": "No",
"subCategory": [
{
"sfid": "5",
"sfName": "Sub Main Fol1",
"sisSubFold": "Yes"
},
{
"sfid": "6",
"sfName": "Sub Main Fol1",
"sisSubFold": "Yes"
},
{
"sfid": "8",
"sfName": "Sub Main Fol1",
"sisSubFold": "Yes"
}
]
},
{
"fid": "7",
"fName": "Main Folder3",
"fisSub": "No",
"subCategory": []
}
]
Here for "fid": "2" having two level hierarchical structure in table, but I'm getting first level only.
Please correct my code for getting hierarchical structure.
Note: there will many hierarchical structure, not only 2nd / 3rd /soon levels.
I searched many things, but not get any correct one. Please help me out from this.
Thanks in advance

Answer 1

What you want to do is recursive query and it is not supported yet on Sequelize, there is a proposal here https://github.com/sequelize/sequelize/issues/4890 the work around is to use the raw function to write your own CTE request.