Mongoose-materialized NPM

Mongoose Materialized

A mongoose plugin for the materialized paths.

Overview

Usage

var mongoose = require('mongoose'),
    materializedPlugin = require('mongoose-materialized'),
    Schema = mongoose.Schema;

mongoose.connect('mongodb://localhost/materialized');

var CatSchema = new Schema({
  name: {type: String}
});


CatSchema.plugin(materializedPlugin);

var Cat= mongoose.model('Cat', CatSchema); // Category

Go to contents

Examples

Adding root and child element.

Important: The model verifies the existence of the parent category before they would save. Except for the root element or change the parent id not touch.

// if you have predefined datas with parent id
Cat.Building(function(){
    // building materialized path
});

// add root element
cat = new Cat({name: "Foods"});
cat.save(function(err, foods){
    // append new sub category
    foods.appendChild({name: "Vegetables"}, function(err, vega){
        // vega: { name: "Vegetables", parentId: [foods ID], path: ',[foods ID]' }
    });
    // or make new
    var vega = new Cat({name: "Vegetables"});
    // saving with append
    foods.appendChild(vega, function(err, data){ ... });
    // or save traditional way
    vega.parentId = foods._id;
    vega.save(function(err, data){ ... });
});

Find element and checking the relationship

Cat.findOne({parentId: null}, function(err, doc){
    // access to the children
    doc.getChildren(function(err, docs){
        // ...
    });

    // access to the children with condition and sort
    doc.getChildren({
        condition: { name: /^a/ },
        sort: { name: 1 }
    },function(err, docs){
        // ...
    });

    // access to the siblings
    doc.getSiblings(function(err, docs){
        // ...
    });

    // access to the ancestors
    doc.getAncestors(function(err, docs){
        // ...
    });

    // check element is root
    doc.isRoot(function(err, isOk){ ... });

    // check element is leaf
    doc.isLeaf(function(err, isLeaf){ ... });

    // depth virtual attributes
    doc.depth

    // use promise
    doc.getChildren().then(function(docs){
        // ...
    });

    // get doc array tree
    doc.getArrayTree(function(err, tree){
        // ... [ {"_id": "...", "children": [ {...} ]}]
    });

    // get doc tree
    doc.getTree(function(err, tree){
        // ... { "doc ID": { ..., children: { ... } }
    });

    // or get tree with condition and sorting
    doc.getTree({
        condition: { name: /^[a-zA-Z]+$/ },
        sort: { name: 1 }
    }, function(err, tree){
        // ...
    });
});

Cat.GetTree('elemt ID', function (err, tree) {
    // ...
});

Cat.GetArrayTree('elemt ID', function (err, tree) {
    // ...
});

// access for full tree in array
Cat.GetFullArrayTree(function (err, tree) {

});

// access for full tree object
Cat.GetFullTree(function (err, tree) {

});

The different arrayTree and simple Tree methods: arrayTree result:

[ 
    { _id: 53ee2db76f2d838a07a04e6a,
    path: '',
    name: 'Foods',
    __v: 0,
    _w: 0,
    parentId: null,
    depth: 0,
    id: '53ee2db76f2d838a07a04e6a',
    children: [ [Object], [Object] ] 
    }
]

and the Tree result:

{ '53ee2db76f2d838a07a04e6a': 
   { _id: 53ee2db76f2d838a07a04e6a,
     path: '',
     name: 'Foods',
     __v: 0,
     _w: 0,
     parentId: null,
     depth: 0,
     id: '53ee2db76f2d838a07a04e6a',
     children: { 
        '53ee2db76f2d838a07a04e6b': [Object] 
        } 
    } 
}

Manipulate child element with static method mongoose-materialized it is possible to use more than one root.

Cat.AppendChild('ID', { 'name': 'Meats'}, function(err, doc){ ... });
Cat.getChildren('ID', function(err, childs){ ... });
Cat.getRoots(function(err, roots){
    // root elements
});

// Format tree, sub element stored in children field
Cat.getRoots({ name: "" }).then(function (err, root) {
    root.getChildren().then(function (err, children) {
        console.log( Cat.toTree(children) );
        // or only shown name
        console.log( Cat.toTree(children, { name: 1 }) );
    });
});

Hierarchical builder for the existing data. Important: This operation is relatively slow. Use only the conversion.

Cat.Building(function(){
    // builded materialized path sturcture
});

// This example convert nested set to materialized path. Use this function to migration.

Cat.Building({
    remove: { lt: 1, gt: 1, children: 1 } // remove nested fields from existsing data
}, function(){
    // building is competted
});

Go to contents

API

Instructions

The following methods must be used with a callback. The callback method have two arguments. The first error and the second data object. If all goes well then the error is null.

model.calledFunction( function (error, data) {
    if (error)
        // handle error
});

The methods with work callback return promise. Mongoose Promise

model.calledFunction().then( function (data) {

}, function (err) {
    // handle error
});

Imprtant! Do not use the following methods:

Model.findByIdAndUpdate()
Model.findByOneAndUpdate()
Model.findByIdAndRemove()
Model.findByOneAndRemove()
Model.update() - static version
instance.update()
Model.remove() - static version

These functions are not triggered by the removal and saving events.

Instead, the following are recommended:

instance.save() - saving and update (before use findOne, findById)
instance.remove() - remove document (before use findOne, findById)
Model.Remove(condition, callback)

The my query object is special object for mongo query. This parameter available for functions.

var query = {
    // mongo condition
    condition: {
        name: /^a/
    },
    // selected fields
    fields: {
        _id: 1,
        name: 1
    },
    // sorting
    sort: {
        name: -1
    }
};

// Example get chidls with query
doc.getChilds(query, function(err, docs){ ... });

To run the tests:

npm test

Go to contents

Attributes

Added attributes:

parentId: Parent item id.
path: materialized path. Auto generated
_w: weight for sort
depth: (virtual) element depth

Go to contents

Static methods

Similar method has the static begins with the first letter capitalized. (IsLeaft is static and isLeaf non static)

IsLeaf(ModelOrId, callback)
IsRoot(ModelOrId, callback)
GetChildren(ModelOrId, query, callback)
GetRoots(query, callback)
GetTree(root condition, children query, callback) - get elemets tree with children
GetFullTree(callback)
GetArrayTree(root condition, children query, callback) - get elemets tree with children
GetFullArrayTree(callback)
Remove(condition, callback) - use this instead of remove.
AppendChild(ModelOrId, callback)
ToTree(documentArray, selected fields) Return object, no mongoose document (toObject()). Fields: { name: 1, _id: 1 }
ToArrayTree(documentArray, selected fields) Return objects in array, no mongoose document (toObject()). Fields: { name: 1, _id: 1 }
Building(prepare, callback) - rebuild material path (good for extisting collections - parentId is needed)

Go to contents

Methods

isRoot(callback)
isLeaf(callback)
isDescendant(callback)
isParent(ModelOrId, callback)
isSibling(ModelOrID, callback)
getParent(callback)
getDescendants(query, callback)
getChildren(query, callback) alias for getDescendants
getAncestors(query, callback)
getSiblings(query, callback)
getTree(query, callback) - get elemets tree with children
getArrayTree(query, callback) - get elemets tree with children, array version
appendChild(model, callback)
setParent(ModelOrId) - if parameter is ID then check parent existence and set parentId (the model parameter to avoid the query)
getChildCondition()
getAncestorsCondition()
getSiblingsCondition()

Go to contents

Changelog

Oct 28, 2017 - version: 0.2.0

fixed update children behavior. Thanks @selcukfatihsevinc
updated dependencies: mongoose 4.12. , Async 2.5.
added support nodejs 8.0
dropped support nodejs 0.6, 0.8

Nov 10, 2016 - version: 0.1.9

fixed MongoDB 3.2 limit issue. Thanks @alexjamesbrown
fixed dependency: should package

Aug 15, 2014 - version: 0.1.8

added new static methods: ToArrayTree(), GetArrayTree(), GetFullArrayTree()
added new methods: getArrayTree()
added new tests
enhancements (toTree, parentId type inherits from _id)
updated README.md and package dependencies

July 30, 2014 - version: 0.1.7

fixed remove parent with parentId=null bug
added new tests
updated README.md

Dec 19, 2013 - version: 0.1.6

added requested function: skip, limit for getDescendants, getChildren, getAncestors, getSiblings
in tree construction (getTree, buildTree) skip, limit methods is not recommended for use

Oct 15, 2013 - version: 0.1.5

fixed typo in 153 line.

Jun 25, 2013 - version: 0.1.4

ToTree use virtuals
better depth solution

Jun 16, 2013 - version: 0.1.3

added GetFullTree static method
added prepare for Building - use: Building({ remove: { lt: 1, gt: 1, level: 1 }, function () { });
added GetFullTree test