mongoose-polymer

Polymorphic associations for mongoose inspired by laravel polymorphic relations and others.

What is it

mongoose-polymer and thus polymorphic associations, allow a model to belong to more than one other model on a single association. For example, you might have a photo model that belongs to either a user model or an product model.

Installation

1$ npm install --save mongoose-polymer

Usage

Require mongoose-polymer after mongoose prior to your schema definition. This allows mongoose-polymer to patch Schema and add all required polymorphism boilerplates.

1var mongoose = require('mongoose');
2var polymer = require('mongoose-polymer');

Polymorphic One-to-One

To define polymorphic one-to-one with mongoose-polymer, use morphBy schema method on the owned model side and morphOne schema method on the owning model side. Consider a case where a user schema and product schema each having a single photo. Here user schema and product schema form the owning side(or parent) and photo schema is the owned side(or child).

Example

1//photo schema defenition
2var PhotoSchema = new Schema({
3   ... 
4});
5PhotoSchema.morphBy('User','photoable');
6PhotoSchema.morphBy('Product','photoable');
7var Photo = mongoose.model('Photo',PhotoSchema);
8
9//user schema definition
10var UserSchema = new Schema({
11   ... 
12});
13UserSchema.morphOne('Photo','photoable');
14var User = mongoose.model('User',UserSchema);
15
16//product schema definition
17var ProductSchema = new Schema({
18   ... 
19});
20PhotoSchema.morphOne('Photo','photoable');
21var Product = mongoose.model('Product',ProductSchema);
22
23//samples
24//adding user photo
25user
26    .setPhoto({name:'user photo'})
27    .exec(function(error,photo){
28        ...
29    });
30
31//get user photo
32user
33    .getPhoto(function(error,photo){
34        ...
35    });
36
37//removing user photo
38user
39    .removePhoto(function(error,photo){
40        ...
41    });
42
43//get photo user
44photo
45    .photoable(function(error,user){
46        ...    
47    });

Polymorphic One-to-Many

To define polymorphic one-to-many with mongoose-polymer, use morphBy schema method on the owned model side and morphMany schema method method in the owning model side. Consider a case where a user schema and product schema each having multiple photo. Here user schema and product schema form the owning side(or parent) and photo schema is the owned side(or child).

Example

1//photo schema definition
2var PhotoSchema = new Schema({
3   ... 
4});
5PhotoSchema.morphBy('User','photoable');
6PhotoSchema.morphBy('Product','photoable');
7var Photo = mongoose.model('Photo',PhotoSchema);
8
9//user schema definition
10var UserSchema = new Schema({
11   ... 
12});
13UserSchema.morphMany('Photo','photoable');
14var User = mongoose.model('User',UserSchema);
15
16//product schema definition
17var ProductSchema = new Schema({
18   ... 
19});
20PhotoSchema.morphMany('Photo','photoable');
21var Product = mongoose.model('Product',ProductSchema);
22
23//samples
24//add user photo
25user
26    .addPhoto({name:'user photo'})
27    .exec(function(error,photo){
28        ...
29    });
30
31//add user photos
32user
33    .addPhoto([{name:'first photo'},{name:'second phot'}])
34    .exec(function(error,photos){
35        ...
36    });
37
38//get all user photos
39user
40    .getPhotos()
41    .exec(function(error,photos){
42        ...
43    });
44
45//get one user photo
46user
47    .getPhoto(photoId)
48    .exec(function(error,photo){
49        ...    
50    });
51
52//remove all user photos
53user
54    .removePhotos()
55    .exec(function(error,photos){
56        ...
57    });
58
59//remove one user photo
60user
61    .removePhoto(photoId)
62    exec(function(error,photo){
63        ...
64    });

API

morphBy(modelName,morphName)

Specifies the owning model of polymorphism. In case of Product and Photo the owning model is Product. modelName is valid model name of the owning side and morpName is the name of polymorphic association formed. morpName controls the name of fields used to store the formed association.

Example

1PhotoSchema.morphBy('Product','photoable');
2...

Following model instance methods will be added to the owned model instance

morphName(callback)

An instance method whose name is determines by morphName will be added to owned side model instance to enable retrieving owning side model instance. For the above cases Photo model instance will gain photoable instance method to enable it to retrieve either Product or User instance.

Example

1//when want to retrieve user from photo instance
2photo
3    .photoable(function(error,user){
4        ...
5    });
6
7//when want to retrieve product from photo instance
8photo
9    .photoable(function(error,product){
10        ...
11    });

morpOne(modelName,morphName)

Specifies the owned model in one-to-one polymorphism. In case of Product and Photo the owned model is Photo. modelName is valid model name of the owned side and morpName is the name of polymorphic association formed. morpName controls mongoose criteria building in the owning side.

Example

1//one-to-one
2PhotoSchema.morphOne('Photo','photoable');
3...

The following model instance methods will be added on owning model instance

getModelName(callback)

Additional instance method whose name is determined by the name of the owned model, will be added to the owning model to enable it to retrieve its polymer. For the case of the above examples User and Product model instance will have instance method with name getPhoto to enable them to get their photo. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when retrieving photo instance from the user instance
2user
3    .getPhoto()
4    //more conditions
5    .exec(function(error,photo){
6        ...
7    });

setModelName(morphOne,callback)

Additional instance method whose name is determined by the name of the owned model, will be added to the owning model to enable it to set its polymer. For the case of the above examples User and Product model instance will have instance method with name setPhoto to enable them to get their photo. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when set photo instance for the user instance
2user
3    .setPhoto({name:'mongoose-polymer'})
4    .exec(function(error,photo){
5        ...
6    });

removeModelName(callback)

Additional instance method whose name is determined by the name of the owned model, will be added to the owning model to enable it to remove its polymer. For the case of the above examples User and Product model instance will have instance method with name removePhoto to enable them to remove their photo. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when removing photo instance from the user instance
2user
3    .removePhoto()
4    //more conditions
5    .exec(function(error,photo){
6        ...
7    });

morphMany(modelName,morphName)

Specifies the owned model in one-to-many polymorphism. In case of Product and Photo the owned model is Photo. modelName is valid model name of the owned side and morpName is the name of polymorphic association formed. morpName controls mongoose criteria building in the owning side.

Example

1//one-to-many
2PhotoSchema.morphMany('Photo','photoable');
3...

The following model instance methods will be added to the owning model instance

getModelName(id,callback)

Additional instance method whose name is determined by the name of the owned model, will be added to the owning model to enable it to get one of its polymer. For the case of the above examples User and Product model instance will have instance method with name getPhoto to enable them to retrieve one of their photo. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when retrieving one photo instance from the user instance
2user
3    .getPhoto(_id)
4    //more conditions
5    .exec(function(error,photo){
6        ...
7    });

getModelNames(callback)

Additional instance method whose name is determined by pluralizing the name of the owned model, will be added to the owning model to enable it to get all of its polymer. For the case of the above examples User and Product model instance will have instance method with name getPhotos to enable them to retrieve all their photos. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when retrieving all photos instance from the user instance
2user
3    .getPhotos()
4    //more conditions
5    .exec(function(error,photos){
6        ...
7    });

addModelName(morpOne,callback)

Additional instance method whose name is determined by the name of the owned model, will be added to the owning model to enable it to add one or more polymer. For the case of the above examples User and Product model instance will have instance method with name addPhoto to enable them to add one or more photo. If callback is not supplied mongoose promise will be returned for evaluation.

Example

1//when adding one photo instance from the user instance
2user
3    .addPhoto({name:'photo name'})
4    .then(function(error,photo){
5        ...
6    });
7
8//when adding multiple photos instance from the user instance
9user
10    .addPhoto([{name:'photo name'},{name:'another photo'}])
11    .then(function(error,photo){
12        ...
13    });

removeModelName(id,callback)

Additional instance method whose name is determined by the name of the owned model, will be added to the owning model to enable it to remove one of its polymer. For the case of the above examples User and Product model instance will have instance method with name removePhoto to enable them to remove one of their photo. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when removing one of the photo instance from the user instance
2user
3    .removePhoto(_id)
4    //more conditions
5    .exec(function(error,photo){
6        ...
7    });

removeModelNames(callback)

Additional instance method whose name is determined by pluralizing the name of the owned model, will be added to the owning model to enable it to remove its polymers. For the case of the above examples User and Product model instance will have instance method with name removePhotos to enable them to remove their photos. If callback is not supplied valid mongoose query will be returned to allow additional chaining.

Example

1//when removing photos instance from the user instance
2user
3    .removePhotos()
4    //more conditions
5    .exec(function(error,photo){
6        ...
7    });

Testing

• Clone this repository

• Install all development dependencies

1$ npm install

• Then run test

1$ npm test

Contribute

It will be nice, if you open an issue first so that we can know what is going on, then, fork this repo and push in your ideas. Do not forget to add a bit of test(s) of what value you adding.

Licence

The MIT License (MIT)

Copyright (c) 2015 lykmapipo & Contributors

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.