statics are the methods defined on the Model.
methods are defined on the document (instance).
We may also define our own custom document instance methods too.
// define a schema
var animalSchema = new Schema({ name: String, type: String }); // assign a function to the "methods" object of our animalSchema
animalSchema.methods.findSimilarTypes = function (cb) {
return this.model('Animal').find({ type: this.type }, cb);
}
Now all of our animal document instances have a findSimilarTypes method available to it.
And then:
Adding static methods to a Model is simple as well. Continuing with our animalSchema:
// assign a function to the "statics" object of our animalSchema
animalSchema.statics.findByName = function (name, cb) {
return this.find({ name: new RegExp(name, 'i') }, cb);
} var Animal = mongoose.model('Animal', animalSchema);
Animal.findByName('fido', function (err, animals) {
console.log(animals);
});
You might do,
Animal . ModalAnimal.findByName('fido', function(err, fido){
// fido => { name: 'fido', type: 'dog' }
});
And then you might use the document instance fido to do
fido . document
fido.findSimilarTypes(function(err, dogs){
// dogs => [ {name:'fido',type:'dog} , {name:'sheeba',type:'dog'} ]
});