Firestore: Query documents by property of object

Question

I've a collection with contacts with a structure like:

name: 'XPTO Company',
emails: { 
    [email protected]: { name: 'Susan', text: 'manager' },
    [email protected]: { name: 'Fred', text: 'marketing' }
}

How do I retrieve documents with email '[email protected]'

Something like:

firebase.firestore().collection('contacts')
      .where(new firebase.firestore.FieldPath('emails', email), '==', true).get()
      .then(snap => {
      })

It doesn't. Think only work for boolean values, not objects. — InfoStatus, Apr 02 '18 at 14:50
Can you create a sub-collection of the company for individual contacts? — Jason Berryman, Apr 02 '18 at 20:51
@JasonBerryman I am pretty sure that you can currently not query by subcollections. They mentioned that we should restructure our data if we want to do something like this. — creativecreatorormaybenot, Apr 03 '18 at 01:09
It depends where you need to query from. If you know that a contact belongs to a particular company, then this is easy. You are correct that you cannot query sub collections across multiple documents — Jason Berryman, Apr 03 '18 at 01:36
Creating a sub-collection is not a solution (at least while it's not possible to query by sub-collections), because I need to find the company that has an employee with that email. — InfoStatus, Apr 03 '18 at 09:37

Mustafa Wahba · Answer 1 · 2020-04-10T11:29:55.033

You may add a property id that holds the email address to your email object. and replace '.' in email object key with '-', e.g. susan@xpto-com, so that your data structure looks like this:

name: 'XPTO Company',
emails: { 
    susan@xpto-com: { id: '[email protected]', name: 'Susan', text: 'manager' },
    fred@xpto-com: { id: '[email protected]', name: 'Fred', text: 'marketing' }

Then you can retrieve documents with email '[email protected]' in this way:

firebase.firestore().collection('contacts')
      .where('[email protected]', '==', '[email protected]').get()
      .then(snap => {
      })

Firestore: Query documents by property of object

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