Firestore Add value to array field
问题 Im trying to use Firebase cloud functions to add the id of a chatroom to the users document in an array field. I cant seem to figure out the way to write to an array field type. here is my cloud function exports.updateMessages = functions.firestore.document('messages/{messageId}/conversation/{msgkey}').onCreate( (event) => { console.log('function started'); const messagePayload = event.data.data(); const userA = messagePayload.userA; const userB = messagePayload.userB; return admin.firestore(