require"google/cloud/firestore"# The `project_id` parameter is optional and represents which project the# client will act on behalf of. If not supplied, the client falls back to the# default project inferred from the environment.firestore=Google::Cloud::Firestore.newproject_id:project_idputs"Created Cloud Firestore client with given project ID."
quickstart.rb

DocumentReferencedocRef=db.collection("users").document("alovelace");// Add document data  with id "alovelace" using a hashmapMap<String,Object>data=newHashMap<>();data.put("first","Ada");data.put("last","Lovelace");data.put("born",1815);//asynchronously write dataApiFuture<WriteResult>result=docRef.set(data);// ...// result.get() blocks on responseSystem.out.println("Update time : "+result.get().getUpdateTime());
Quickstart.java

doc_ref=db.collection("users").document("alovelace")doc_ref.set({"first":"Ada","last":"Lovelace","born":1815})
snippets.py

doc_ref=db.collection("users").document("alovelace")awaitdoc_ref.set({"first":"Ada","last":"Lovelace","born":1815})
snippets.py

constdocRef=db.collection('users').doc('alovelace');awaitdocRef.set({first:'Ada',last:'Lovelace',born:1815});
index.js

_,_,err:=client.Collection("users").Add(ctx,map[string]interface{}{"first":"Ada","last":"Lovelace","born":1815,})iferr!=nil{log.Fatalf("Failed adding alovelace: %v",err)}
main.go

DocumentReferencedocRef=db.Collection("users").Document("alovelace");Dictionary<string,object>user=newDictionary<string,object>{{"First","Ada"},{"Last","Lovelace"},{"Born",1815}};awaitdocRef.SetAsync(user);
Program.cs

doc_ref=firestore.doc"#{collection_path}/alovelace"doc_ref.set({first:"Ada",last:"Lovelace",born:1815})puts"Added data to the alovelace document in the users collection."
quickstart.rb

DocumentReferencedocRef=db.collection("users").document("aturing");// Add document data with an additional field ("middle")Map<String,Object>data=newHashMap<>();data.put("first","Alan");data.put("middle","Mathison");data.put("last","Turing");data.put("born",1912);ApiFuture<WriteResult>result=docRef.set(data);System.out.println("Update time : "+result.get().getUpdateTime());
Quickstart.java

doc_ref=db.collection("users").document("aturing")doc_ref.set({"first":"Alan","middle":"Mathison","last":"Turing","born":1912})
snippets.py

doc_ref=db.collection("users").document("aturing")awaitdoc_ref.set({"first":"Alan","middle":"Mathison","last":"Turing","born":1912})
snippets.py

constaTuringRef=db.collection('users').doc('aturing');awaitaTuringRef.set({'first':'Alan','middle':'Mathison','last':'Turing','born':1912});
index.js

_,_,err=client.Collection("users").Add(ctx,map[string]interface{}{"first":"Alan","middle":"Mathison","last":"Turing","born":1912,})iferr!=nil{log.Fatalf("Failed adding aturing: %v",err)}
main.go

DocumentReferencedocRef=db.Collection("users").Document("aturing");Dictionary<string,object>user=newDictionary<string,object>{{"First","Alan"},{"Middle","Mathison"},{"Last","Turing"},{"Born",1912}};awaitdocRef.SetAsync(user);
Program.cs

doc_ref=firestore.doc"#{collection_path}/aturing"doc_ref.set({first:"Alan",middle:"Mathison",last:"Turing",born:1912})puts"Added data to the aturing document in the users collection."
quickstart.rb

// asynchronously retrieve all usersApiFuture<QuerySnapshot>query=db.collection("users").get();// ...// query.get() blocks on responseQuerySnapshotquerySnapshot=query.get();List<QueryDocumentSnapshot>documents=querySnapshot.getDocuments();for(QueryDocumentSnapshotdocument:documents){System.out.println("User: "+document.getId());System.out.println("First: "+document.getString("first"));if(document.contains("middle")){System.out.println("Middle: "+document.getString("middle"));}System.out.println("Last: "+document.getString("last"));System.out.println("Born: "+document.getLong("born"));}
Quickstart.java

users_ref=db.collection("users")docs=users_ref.stream()asyncfordocindocs:print(f"{doc.id} =>{doc.to_dict()}")
snippets.py

constsnapshot=awaitdb.collection('users').get();snapshot.forEach((doc)=>{console.log(doc.id,'=>',doc.data());});
index.js

iter:=client.Collection("users").Documents(ctx)for{doc,err:=iter.Next()iferr==iterator.Done{break}iferr!=nil{log.Fatalf("Failed to iterate: %v",err)}fmt.Println(doc.Data())}
main.go

CollectionReferenceusersRef=db.Collection("users");QuerySnapshotsnapshot=awaitusersRef.GetSnapshotAsync();foreach(DocumentSnapshotdocumentinsnapshot.Documents){Console.WriteLine("User: {0}",document.Id);Dictionary<string,object>documentDictionary=document.ToDictionary();Console.WriteLine("First: {0}",documentDictionary["First"]);if(documentDictionary.ContainsKey("Middle")){Console.WriteLine("Middle: {0}",documentDictionary["Middle"]);}Console.WriteLine("Last: {0}",documentDictionary["Last"]);Console.WriteLine("Born: {0}",documentDictionary["Born"]);Console.WriteLine();}
Program.cs

users_ref=firestore.colcollection_pathusers_ref.getdo|user|puts"#{user.document_id} data:#{user.data}."end
quickstart.rb