Compound query with range and inequality filters on multiple fields

Please provide C# and Ruby samples that match Firestore and Datastore examples originally requested in the Firestore Doc Plan for Multiple Inequalities to GA and bug 351980346. The request is for turbo/469184.

Explore further

For detailed documentation that includes this code sample, see the following:

• Query with range and inequality filters on multiple fields overview
• Query with range and inequality filters on multiple fields overview

Code sample

C#

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

CollectionReference citiesRef = db.Collection("cities");
Query query = citiesRef
    .WhereGreaterThan("Population", 1000000)
    .WhereLessThan("Density", 10000);
QuerySnapshot querySnapshot = await query.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in querySnapshot)
{
    var name = documentSnapshot.GetValue<string>("Name");
    var population = documentSnapshot.GetValue<int>("Population");
    var density = documentSnapshot.GetValue<int>("Density");
    Console.WriteLine($"City '{name}' returned by query. Population={population}; Density={density}");
}

Go

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/firestore"
)

func multipleInequalitiesQuery(w io.Writer, projectID string) error {
	ctx := context.Background()

	// Create client
	client, err := firestore.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("firestore.NewClient: %w", err)
	}
	defer client.Close()

	// Create query
	query := client.Collection("cities").
		Where("population", ">", 1000000).
		Where("density", "<", 10000)

	// Get documents
	docSnapshots, err := query.Documents(ctx).GetAll()
	for _, doc := range docSnapshots {
		fmt.Fprintln(w, doc.Data())
	}
	if err != nil {
		return fmt.Errorf("GetAll: %w", err)
	}

	return nil
}

Java

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

Query query =
    db.collection("cities")
        .whereGreaterThan("population", 1000000)
        .whereLessThan("density", 10000);

PHP

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

$collection = $db->collection('samples/php/cities');
$chainedQuery = $collection
    ->where('population', '>', 1000000)
    ->where('density', '<', 10000);

Python

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

query = (
    db.collection("cities")
    .where(filter=FieldFilter("population", ">", 1_000_000))
    .where(filter=FieldFilter("density", "<", 10_000))
)

What's next

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