firestore search query code example

Example 1: how to query in firestore

db.collection("cities").where("capital", "==", true)
    .get()
    .then(function(querySnapshot) {
        querySnapshot.forEach(function(doc) {
            // doc.data() is never undefined for query doc snapshots
            console.log(doc.id, " => ", doc.data());
        });
    })
    .catch(function(error) {
        console.log("Error getting documents: ", error);
    });

Example 2: firestoreConnect query

firestoreConnect((props) => {
		let propertyDocRef = firebase.firestore().collection('properties').doc(props.propertyId)
		if (!props.propertyId) return []
		return [
			{
				collection : 'properties',
                doc            : props.propertyId,
				subcollections : [
					{ collection: 'tasks' }
				],
				storeAs        : 'tasks',
				orderBy        : [
					'createdAt',
					'desc'
				]
			},
			{
				collection : 'likes',
				where      : [
					[
						'property',
						'==',
						propertyDocRef
					]
				]
			}
		]
	})

Example 3: firestore search query flutter

import 'package:flutter/material.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:firebase_database/ui/firebase_animated_list.dart';

class Db extends StatefulWidget {
  @override
  HomeState createState() => HomeState();
}

class HomeState extends State {
  List Remedios = List();
  Item item;
  DatabaseReference itemRef;
  TextEditingController controller = new TextEditingController();
  String filter;

  final GlobalKey formKey = GlobalKey();

  @override
  void initState() {
    super.initState();
    item = Item("", "");
    final FirebaseDatabase database = FirebaseDatabase.instance; //Rather then just writing FirebaseDatabase(), get the instance.
    itemRef = database.reference().child('Remedios');
    itemRef.onChildAdded.listen(_onEntryAdded);
    itemRef.onChildChanged.listen(_onEntryChanged);
    controller.addListener(() {
  setState(() {
    filter = controller.text;
  });
});
  }

  _onEntryAdded(Event event) {
    setState(() {
      Remedios.add(Item.fromSnapshot(event.snapshot));
    });
  }

  _onEntryChanged(Event event) {
    var old = Remedios.singleWhere((entry) {
      return entry.key == event.snapshot.key;
    });
    setState(() {
      Remedios\[Remedios.indexOf(old)\] = Item.fromSnapshot(event.snapshot);
    });
  }

  void handleSubmit() {
    final FormState form = formKey.currentState;

    if (form.validate()) {
      form.save();
      form.reset();
      itemRef.push().set(item.toJson());
    }
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: new AppBar(
        centerTitle: true,
        backgroundColor: new Color(0xFFE1564B),
      ),
      resizeToAvoidBottomPadding: false,
      body: Column(
        children: \[
          new TextField(
          decoration: new InputDecoration(
          labelText: "Type something"
          ),
          controller: controller,
          ),
          Flexible(
            child: FirebaseAnimatedList(
              query: itemRef,
              itemBuilder: (BuildContext context, DataSnapshot snapshot,
                  Animation animation, int index) {
                return  Remedios\[index\].name.contains(filter) || Remedios\[index\].form.contains(filter) ? ListTile(
                  leading: Icon(Icons.message),
                  title: Text(Remedios\[index\].name),
                  subtitle: Text(Remedios\[index\].form),
                ) : new Container();
              },
            ),
          ),
        \],
      ),
    );
  }
}

class Item {
  String key;
  String form;
  String name;

  Item(this.form, this.name);

  Item.fromSnapshot(DataSnapshot snapshot)
      : key = snapshot.key,
        form = snapshot.value\["form"\],
        name = snapshot.value\["name"\];

  toJson() {
    return {
      "form": form,
      "name": name,
    };
  }
}