models/Note.js


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const {encrypt, decrypt} = require('lib/crypt')
const mongoose = require('mongoose')

const noteSchema = new mongoose.Schema({
  content: {type: String, required: true, minlength: 1},
})

noteSchema.statics.getNote = async (id) => {
  const note = await Note.findById(id)
  if (!note) throw new Error('Could not fetch note')

  const content = decrypt(note.content)

  return {...note, content}
}

noteSchema.statics.updateNote = async (id, content) => {
  const note = await Note.findByIdAndUpdate(id, {content: encrypt(content)}, {new: true})

  if (!note) throw new Error('Could not update note')

  return {...note, content}
}

noteSchema.pre('save', async function(next){
  const note = this;

  if (note.isModified('content')) {
    note.content = await encrypt(note.content)
  }

  next()
})

const Note = mongoose.models.Note || mongoose.model('Note', noteSchema)

export default Note