Joins into the array

[dspangenberg]

I have a collection (contacts) with an array of email addresses. Every email has a category, which I will join directly to the similar item in the array. Is this possible?

Simplified contacts collection:

contacts = [
  {
    name: 'John Doe',
    emails: [
      {
        value: '[email protected]',
        category: 'abcdefg'
      },
      {
        value: '[email protected],
        category: 'hijklmn'
      }
    ]
  }
]

Simplified categories collection:

emailCategories = [
  {
    _id: 'abcdefg',
    name: 'Work'
  },
  {
    _id: 'hijklmn',
    name: 'Home'
  }
]

Wished result:

result = [
  {
    name: 'John Doe',
    emails: [
      {
        value: '[email protected]',
        category: {
          name: 'Work'
        }
      },
      {
        value: '[email protected],
        category: {
          name: 'Home'
        }
      }
    ]
  }
]