mongoose-relative-url.js

module.exports = exports = function relativeImageUrl(schema, options) {
  var relField = options.relativeUrlField || 'relUrl',
    field = {};

  field[relField] = String;
  schema.add(field);

  schema.pre('save', function(next) {
    var photoField = options.absoluteUrlField || 'large',
      removeStr = process.env.PWD + '/client',
      absUrl = this.photo[photoField].url;

    this[relField] = absUrl.replace(removeStr, '');
    next();
  });
};

photo.model.js

'use strict';

var mongoose = require('mongoose'),
  crate = require('mongoose-crate'),
  localFS = require('mongoose-crate-localfs'),
  GraphicsMagic = require('mongoose-crate-gm'),
  relativeUrl = require('../../components/mongoose-relative-url'),
  path = require('path'),
  Schema = mongoose.Schema;

var PhotoSchema = new Schema({
  author: String,
  author_email: String,
  message: String,
  date: { type: Date, default: Date.now },
  active: Boolean
});

PhotoSchema.plugin(crate, {
  storage: new localFS({
    directory: path.join(process.env.PWD, 'client/uploads/photos')
  }),
  fields: {
    photo: {
      processor: new GraphicsMagic({
        tmpDir: '/tmp',
        formats: ['JPEG', 'GIF', 'PNG'],
        transforms: {
          original: {},
          small: {
            resize: '320x200',
            format: '.jpg'
          },
          medium: {
            resize: '640x480',
            format: '.jpg'
          },
          large: {
            resize: '1920x1080', // '1024x768',
            format: '.jpg'
          }
        }
      })
    }
  }
});

// Plugin usage example
PhotoSchema.plugin(relativeUrl, {
  absoluteUrlField: 'large',
  relativeUrlField: 'visualizerPhoto'
});

module.exports = mongoose.model('Photo', PhotoSchema);