node.js►note

Mongoose notes

Custom getters

Use custom getters to process the MongoDB retunred data, like an interceptor.

Schema custom getters doesn’t work with lean().

Set up the Schema:

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DBSchema.set('toObject', {getters: true, virtuals: true});
DBSchema.set('toJSON', {getters: true, virtuals: true});

Add custom get function on specified field:

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DBSchema.path('images').get(function (images) {
  if (images && Array.isArray(images) && images.length > 0) {
    images = images.map(function (image) {
      return getUrl(image);
    });
  }
  return images;
});

Schema.toJSON() should be used in a service, after the records are found.