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You can listen to a document with the onSnapshot() method. An initial call using the callback you provide creates a document snapshot immediately with the current contents of the single document. Then, each time the contents change, another call updates the document snapshot. So instead of querySnapshot?.documents I've used: querySnapshot?.documentChanges And instead of doc.data() I've used doc.document. It's more efficient because you don't load all of the messages to the Message every time you pull your messages from firestore. First time it gets all of the messages and the next times it gets only messages which changed. So, messages = [], should be used before pulling all database.
ramjisekhar
approved these changes
Nov 5, 2020
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An initial call using the callback you provide creates a document snapshot immediately with the current contents of the single document. Then, each time the contents change, another call updates the document snapshot.
So instead of querySnapshot?.documents I've used: querySnapshot?.documentChanges
And instead of doc.data() I've used doc.document.
It's more efficient because you don't load all of the messages to the Message every time you pull your messages from firestore.
First time it gets all of the messages and the next times it gets only messages which changed.
So, messages = [], should be used before pulling all database.