问题
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:
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?
Thanks.
回答1:
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"].
回答2:
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....).
来源：https://stackoverflow.com/questions/52108304/firestore-array-contains-only-works-with-string-not-with-object