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This plugin let you add a
alias key to your schema and create getter and setter for your field using that alternate name.
Plugin is intended to write short-keys for you documents on the DB but let you use long, descriptive name when reading fetched documents. This will result in less storage needed to memorize your data having no need to remember short key meanings.
IMPORTANT: Starting from version 4.10.0 of mongoose, a feature similar to the one provided by this plugin has been developed in the core library. Even if the implementation are not exactly the same, I prefer to deprecate this plugin in favor of the core implementation. For this reason this plugin won't install anymore alongside a recent version of mongoose. If something is missing in the core implementation you should open a request on the mongoose github page.
To install it in your node.js project
npm install mongoose-aliasfield
or add it to your package.json dependencies
Take this schema as example:
var mongoose = ;var fieldsAliasPlugin = ;/*Describe a Schema*/var PersonSchema ='t' : 'type': Date 'index': true 'alias': 'timestamp''n' : 'type' : String 'alias': 'name''s' : 'type' : String 'alias': 'surname''p' :'a' : 'type' : String 'alias': 'profile.address''pn': 'type' : String 'alias': 'profile.phone_number';/*Add field alias plugin*/PersonSchema;/*Person will be the model*/
Now that your
schema is created you can use alias field name to describe an instance of your model
var person ='timestamp' :'name' : 'Jhon''surname' : 'Doe''profile.address': 'Rue de Morgane''profile.phone_number': '051-123456 78';person;
Even getters will run out of the box
var full_name = personname+' '+personsurname;
full_name will be
The only limitation in setters and getters is that you can't use partial path for nested properties
/*THIS WON'T ACT AS EXPECTED!*/var user_profile = personprofile;
You'll be able to obtain even an aliased description of object as i the example below
Your models gain a method called
toAliasedFieldsObject which return a long-descriptive version of your docs:
'name' : 'Jhon''surname': 'Doe''profile':'address' : 'Rue de Morgane''phone_number' : '051-123456 78'
The same is applyable to an array of results
Sometimes you want to do some operation but you have just the aliased representation of an instance. Consider the following example:
var PersonSchema =n : type : String required : true alias: 'name'a :s: type: String alias: 'address.street'd: type: Date alias: 'address.date'likes: type: Number;PersonSchema;thisPerson = mongoose;
let's say you want to do an update
var data =name: 'John'address:street: 'Avenue ...'date:likes: 5Person;
This won't work because mongoose is not able to understand the aliases.
Your model has a static method which help you to move from an aliased representation of your data to the one you have on the database.
You can write
Edge case: you cannot transform mixed representation. All the properties which have an alias must be represented with the alias.
In our example this won't work:
var data =name: 'John'address:s: 'Avenue ...'d:likes: 5Person; // This will result in an invalid object
here we are mixing
address (aliased) and
s (not aliased), which is not permitted.
toOriginalFieldsObject can be expensive, so use it only if you're forced to.
You can transform even a single field. Given the same schema as before
const flatten = Person;// flatten is// 'a.s'
Fabrizio 'ramiel' Ruggeri