mongoose-id-validator

Provides a mongoose plugin that can be used to verify that a document which references other documents by their ID is referring to documents that actually exist.

This plugin works by performing a count query for documents in the relevant collection with the ID specified in the document being validated. Note that the validation method is only executed if the ID value has been updated. This helps prevent unnecessary queries when saving a document if the ID has not been changed.

However, please be aware that this will NOT catch any IDs that were valid at the time they were saved but the referenced document has subsequently been removed. You should have validation logic in your delete/remove code to handle this.

Usage

Install via NPM

$ npm install mongoose-id-validator

Then you can use the plugin on your schemas

var idvalidator = require('mongoose-id-validator');

var ManufacturerSchema = new Schema({
  name : String
});
var Manufacturer = mongoose.model('Manufacturer', ManufacturerSchema);

var CarSchema = new Schema({
  name         : String,
  manufacturer : { 
  					type: Schema.Types.ObjectId, 
  					ref: 'Manufacturer',
  					required: true
  				  }
});
CarSchema.plugin(idvalidator);
var Car = mongoose.model('Car', CarSchema);

var ford = new ManufacturerSchema({ name : 'Ford' });

ford.save(function() {
  var focus = new Car({ name : 'Focus' });
  focus.manufacturer = "50136e40c78c4b9403000001";

  focus.validate(function(err) {
    //err.errors would contain a validation error for manufacturer with default message
    
    focus.manufacturer = ford;
    focus.validate(function(err) {
      //err will now be null as validation will pass
    });
  });
});

You may also use declare a optional refConditions method in your schema. For example:

var OtherSchema = new Schema({
  referencedId : { 
  					type: Schema.Types.ObjectId, 
  					ref: 'RefSchema',
  					refConditions: {
  					  field1: 123
  					}
  				  }
});

The referenceId value in the code above would only pass validation if the object with this ID exists AND had a property 'field1' that has the value 123. If any conditional property does not match then it would not pass validation.

You can also use this plugin to validate an array of ID references. Please note as above that the implementation runs a single count query to keep the performance impact to a minimum. Hence you will know if there is a bad ID value in the array of references but not which one it is.

An example of this is below:

var idvalidator = require('mongoose-id-validator');

var ColourSchema = new Schema({
  name : String
});
var Colour = mongoose.model('Colour', ColourSchema);

var CarSchema = new Schema({
  name         : String,
  colours	   : [{ 
  					type: Schema.Types.ObjectId, 
  					ref: 'Colour'
  				  ]}
});
CarSchema.plugin(idvalidator);
var Car = mongoose.model('Car', CarSchema);

var red = new Colour({ name : 'Red' });
var blue = new Colour({ name : 'Blue' });

red.save(function() {
  blue.save(function() {
    var focus = new Car({ name : 'Focus' });
    focus.colours = [red, "50136e40c78c4b9403000001"];

    focus.validate(function(err) {
      //err.errors would contain a validation error for colours with default message
    
      focus.colours = [red, blue]
      focus.validate(function(err) {
        //err will now be null as validation will pass
      });
    });
  });
});

Options

Model.plugin(id-validator, {
  /* Custom validation message with {PATH} being replaced 
  * with the relevant schema path that contains an invalid 
  * document ID.
  */
  message : 'Bad ID value for {PATH}'  
});

Tests

To run the tests you need a local MongoDB instance available. Run with:

npm test

Issues

Please use the GitHub issue tracker to raise any problems or feature requests.

If you would like to submit a pull request with any changes you make, please feel free!

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