mcapodici · June 1, 2023 03:03 · Jun 1, 2023
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+Certainly! I can help you understand how to use the `get()` function in Firestore security rules to make permissions dependent on data within another collection. Although I don't have the ability to share photos directly, I can guide you through the process step by step.
+
+Let's assume you have a Firestore database structure as follows:
+
+```
+- parentCollection (collection)
+  - documentA (document)
+    - subCollectionX (collection)
+      - subDocumentX (document)
+  - documentB (document)
+    - subCollectionY (collection)
+      - subDocumentY (document)
+```
+
+To set up security rules based on data from `subCollectionX` and `subCollectionY`, you can follow these steps:
+
+1. Access `subCollectionX` from `documentA`:
+```javascript
+function checkSubCollectionX(documentId) {
+  return get(/databases/$(database)/documents/parentCollection/documentA/subCollectionX/$(documentId)).data;
+}
+```
+Here, `documentId` is the ID of the document you want to access within `subCollectionX`. The `get()` function is used to retrieve the document data, and `.data` is used to access the fields within the document.
+
+2. Access `subCollectionY` from `documentB`:
+```javascript
+function checkSubCollectionY(documentId) {
+  return get(/databases/$(database)/documents/parentCollection/documentB/subCollectionY/$(documentId)).data;
+}
+```
+Similarly, `documentId` is the ID of the document you want to access within `subCollectionY`. The `get()` function retrieves the document data, and `.data` is used to access the fields within the document.
+
+You can then use these functions in your security rules to check permissions based on the data from `subCollectionX` and `subCollectionY`. For example, let's say you want to allow read access to a collection `someCollection` only if a certain field in `subCollectionX` matches a value in `subCollectionY`:
+
+```javascript
+match /someCollection/{documentId} {
+  allow read: if checkSubCollectionX(documentId).fieldName == checkSubCollectionY(documentId).fieldName;
+}
+```
+In this rule, `fieldName` represents the specific field you want to compare.
+
+These examples demonstrate how to use the `get()` function to retrieve data from two sub-collections within a parent collection and how to incorporate that data into your security rules. Remember to adjust the paths and field names to match your database structure.
+
+I hope this explanation helps you understand how to use the `get()` function in Firestore security rules. If you have any further questions, feel free to ask!
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