CODEWITHSUNDEEP
node.jsmongodbmongoose
Bilal
Bilal

Reputation: 2673

Mongoose plugin to assign extra data to a field but not saving to database

I am trying to write a plugin that should return extra data by setting on a field tags already saved to model instead of saving set data on tags to database and return. Here is plugin code.

module.exports = function samTagsPlugin(schema, options) {
    schema.post('init', function () {
        document.set('tags', ['a', 'b', 'c']);
    });
};

But, the tags field is saved to mongodb with the values ['a', 'b', 'c']. Is there any way I can just assign dynamic value to tags and mongoose do not save the provided value to database? Mongoose version I am using is 3.8.x.

Upvotes: 1

Views: 456

Answers (1)

Bilal
Bilal

Reputation: 2673

So here is how I solved this using virtual fields (Thanks @Manu).

var MySchema = new Schema({
  type: {
    type: String,
    uiGrid: {name: 'Type', order: 15},
    required: true
  },
  contactNumber: {type: String, uiForm: {name: 'Contact Number'}},
  __customTags: [String]
}, {
  toObject: {
    virtuals: true
  },
  toJSON: {
    virtuals: true
  }
});

Not that here I have added a field __customTags. In mongoose everything starts with __ will not be persisted to database. And then 

MySchema.virtual('tags').get(function() {
  return this.__customTags;
}).set(function(tags) {
  this.__customTags = tags;
});

From my plugin, I am assigning tags to an array of values I want.

this.set('tags', tags);

Upvotes: 0

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