Fix issue #1523 (#1567)

CHANGELOG.md

@@ -1,3 +1,4 @@
 * Allow passing `GOOGLE_APPLICATION_CREDENTIALS` environment variable into the functions emulator.
 * Set FIREBASE_DATABASE_EMULATOR_HOST in emulators:exec.
 * Add upsert API for function triggers to the database emulator.
+* Fix a bug where only one RTDB function could be registered by using the RTDB emulator upsert API to register functions triggers.

src/emulator/functionsEmulator.ts

@@ -589,14 +589,12 @@ You can probably fix this by running "npm install ${
       return Promise.reject();
     }
 
-    const bundle = JSON.stringify([
-      {
-        name: `projects/${projectId}/locations/_/functions/${definition.name}`,
-        path: result[1], // path stored in the first capture group
-        event: definition.eventTrigger.eventType,
-        topic: `projects/${projectId}/topics/${definition.name}`,
-      },
-    ]);
+    const bundle = JSON.stringify({
+      name: `projects/${projectId}/locations/_/functions/${definition.name}`,
+      path: result[1], // path stored in the first capture group
+      event: definition.eventTrigger.eventType,
+      topic: `projects/${projectId}/topics/${definition.name}`,
+    });
 
     logger.debug(`addDatabaseTrigger`, JSON.stringify(bundle));
     return new Promise<boolean>((resolve, reject) => {
@@ -611,7 +609,7 @@ You can probably fix this by running "npm install ${
           }'`
         );
       }
-      request.put(
+      request.post(
         setTriggersPath,
         {
           auth: {