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Firestore get documents with maximum value


By : Fahd Alshri
Date : September 16 2020, 01:00 AM
should help you out Firestore doesn't offer any grouping in queries. There are no aggregate functions as you might know from SQL type databases.
If you need to track aggregate information, you will have to find another way to record that information. Usually that requires another collection (in your case, one document per user) where aggregate values, such as min and max values, are stored and updated as the "source" collection changes over time.
code :


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Firebase Rules for Cloud Firestore to limit maximum number of documents


By : Jaspreet Singh
Date : March 29 2020, 07:55 AM
this will help You can protect this using the query property of the request object (see docs). Basically you can write a rule with a condition on the limit:
code :
allow read: if request.query.limit != 10

Flutter Firestore: specific documents from a collection (Firestore.collection.where)


By : Kaustubh
Date : March 29 2020, 07:55 AM
I wish this helpful for you Firebase does not support logical OR queries. In this case, you should create a separate query for each OR condition and merge the query results in your app.

Firestore: Getting documents sorted by a numeric field contained in the two sub-levels documents


By : user2338640
Date : March 29 2020, 07:55 AM
This might help you
They must be sorted according to the value of a numeric field, titled amount, present in a first sub-level document and also in a second sub-level document.

Pulling firestore image from firebase firestore database in react native - RangeError: Maximum call stack size exceeded


By : user3642909
Date : March 29 2020, 07:55 AM
will help you Instead of calling method directly source you do like this :
first call async method and in between time display image with static image and when image will available display that.
code :
//Function being called:
getPostImage = async (post) => {
  const imageUrl = await firebase.storage().ref(`photos/${post.uid}/${post.timestamp}.jpg`).getDownloadURL();
  this.setState({
    downloadedImage: imageUrl
  });
};
...
//Calling the function in the image component:
<Image source={this.state.downloadedImage ? {uri: this.state.downloadedImage} : 'localPlaceholderImage.png'} style={styles.postImage} resizeMode="cover" />

Firestore 'get' query for all documents in a collection returns no documents


By : Neil Hodgson
Date : March 29 2020, 07:55 AM
this one helps. First of all, you are reaching into the snapshot object using private properties:
code :
snapshot._docs
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