in Security Firstore Rules does it possible to only make users to read data depending on field value?

Question

for example in Firstore i have collection called products and every doc has boolen field called isAllow : false

now in Security Firstore Rules How to make users can read only the docs with true value of isAllow field and the same with write .. i read the documentation but couldn't understand exactly what i want

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write;
    }
  }
}

Answer 1

Yes,

match /collection/{document} {
  allow read: if resource.data.isAllow == true;
}

Here resource.data is a map of all of the fields and values stored in the document and the above rule will allow read operation only when isAllow field in the document being accessed is true.