Firestore to query by an array’s field value

I’m trying to run a simple query, where I search for a document that contains a value inside an object array.

For instance, look at my database structure:

Firestore to query by an array's field value

I want to run a query similar to this:

db.collection('identites').where("partyMembers", "array-contains", {name: "John Travolta"})

What is the correct way to achieve this, is it even possible with Firestore?



Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

As Frank has explained in his answer it is not possible, with array-contains, to query for a specific property of an object stored in an array.

However, there is a possible workaround: it is actually possible to query for the entire object, as follows, in your case:

db.collection('identites').where("partyMembers", "array-contains", {id: "7LNK....", name: "John Travolta"})

Maybe this approach will suit your needs (or maybe not….).

Method 2

The array-contains operations checks if an array, contains a specific (complete) value. It can’t check if an array of objects, contains an item with a specific value for a property.

The only way to do your query, is to add an additional field to your document with just the value you want to query existence on. So for example: partyMemberNames: ["John Travolta", "Olivia Newton"].

Method 3

If you want to extract name: “John Travolta” from “partyMembers” array in a document. you can achieve this by some similar approach in which you can loop through all arrays in a document to find this name.

const [names, setNames] = React.useState([])

const readAllNames = async() => {
const snapshot = await firebase.firestore().collection('identites').doc(documentID).get()
      const filterData = => === "John Travolta" ? val : null)
      setNames( filterData.filter(e=>e) );

This technique is used in perticular Document as we are giving .doc(documentID) This way you can get all the arrays having name: “John Travolta” in names constant.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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