read fix

README.md

@@ -23,174 +23,176 @@ pod 'RxFirebase'
 ## Usage
 
 ```swift
-        import RxFirebase
+import RxFirebase
 ```
 
 ### Firestore
 
 Setting data:
 ```swift
-        let db = Firestore.firestore()
+let db = Firestore.firestore()
+
+// Add a new document in collection "cities"
+db.collection("cities")
+    .document("SF")
+    .rx
+    .setData([
+        "name": "San Francisco",
+        "state": "CA",
+        "country": "USA",
+        "capital": false,
+        "population": 860000
+        ]).subscribe(onError: { error in
+            print("Error setting data: \(error)")
+        }).disposed(by: disposeBag)
+       
+// Add a new document with a generated id.
+db.collection("cities")
+    .rx
+    .addDocument(data: [
+        "name": "San Francisco",
+        "state": "CA",
+        "country": "USA",
+        "capital": false,
+        "population": 860000
+        ]).subscribe(onNext: { ref in
+            print("Document added with ID: \(ref.documentID)")
+        }, onError: { error in
+            print("Error adding document: \(error)")
+        }).disposed(by: disposeBag)
         
-        // Add a new document in collection "cities"
-        db.collection("cities")
-            .document("SF")
-            .rx
-            .setData([
-                "name": "San Francisco",
-                "state": "CA",
-                "country": "USA",
-                "capital": false,
-                "population": 860000
-                ]).subscribe(onError: { error in
-                    print("Error setting data: \(error)")
-                }).disposed(by: disposeBag)
-               
-        // Add a new document with a generated id.
-        db.collection("cities")
-            .rx
-            .addDocument(data: [
-                "name": "San Francisco",
-                "state": "CA",
-                "country": "USA",
-                "capital": false,
-                "population": 860000
-                ]).subscribe(onNext: { ref in
-                    print("Document added with ID: \(ref.documentID)")
-                }, onError: { error in
-                    print("Error adding document: \(error)")
-                }).disposed(by: disposeBag)
-                
-        // Set the "capital" field of the city 'SF'
-        db.collection("cities")
-            .document("SF")
-            .rx
-            .updateData([
-                "capital": true
-                ]).subscribe(onNext: {
-                    print("Document successfully updated")
-                }, onError: { error in
-                    print("Error updating document: \(error)")
-                }).disposed(by: disposeBag)
-                
-        // https://firebase.google.com/docs/firestore/manage-data/add-data
+// Set the "capital" field of the city 'SF'
+db.collection("cities")
+    .document("SF")
+    .rx
+    .updateData([
+        "capital": true
+        ]).subscribe(onNext: {
+            print("Document successfully updated")
+        }, onError: { error in
+            print("Error updating document: \(error)")
+        }).disposed(by: disposeBag)
+        
+// https://firebase.google.com/docs/firestore/manage-data/add-data
 ```
 
 Get a document
 ```swift
-        let db = Firestore.firestore()
+let db = Firestore.firestore()
 
-        db.collection("cities")
-            .document("SF")
-            .rx
-            .getDocument()
-            .subscribe(onNext: { document in
-                if let document = document {
-                    print("Document data: \(document.data())")
-                } else {
-                    print("Document does not exist")
-                }
-            }, onError: { error in
-                print("Error fetching snapshots: \(error)")
-            }).disposed(by: disposeBag)
-            
-        // https://firebase.google.com/docs/firestore/query-data/get-data
+db.collection("cities")
+    .document("SF")
+    .rx
+    .getDocument()
+    .subscribe(onNext: { document in
+        if let document = document {
+            print("Document data: \(document.data())")
+        } else {
+            print("Document does not exist")
+        }
+    }, onError: { error in
+        print("Error fetching snapshots: \(error)")
+    }).disposed(by: disposeBag)
+    
+// https://firebase.google.com/docs/firestore/query-data/get-data
 ```
 
 Get Realtime Updates
 ```swift
-        let db = Firestore.firestore()
+let db = Firestore.firestore()
 
-        // Document
-        db.collection("cities")
-            .document("SF")
-            .rx
-            .listen()
-            .subscribe(onNext: { document in
-                print("Current data: \(document.data())")
-            }, onError: { error in
-                print("Error fetching snapshots: \(error)")
-            }).disposed(by: disposeBag)
-            
-        // Collection
-        db.collection("cities")
-            .rx
-            .listen()
-            .subscribe(onNext: { snapshot in
-                snapshot.documentChanges.forEach { diff in
-                    if (diff.type == .added) {
-                        print("New city: \(diff.document.data())")
-                    }
-                    if (diff.type == .modified) {
-                        print("Modified city: \(diff.document.data())")
-                    }
-                    if (diff.type == .removed) {
-                        print("Removed city: \(diff.document.data())")
-                    }
-                }
-            }, onError: { error in
-                print("Error fetching snapshots: \(error)")
-            }).disposed(by: disposeBag)
+// Document
+db.collection("cities")
+    .document("SF")
+    .rx
+    .listen()
+    .subscribe(onNext: { document in
+        print("Current data: \(document.data())")
+    }, onError: { error in
+        print("Error fetching snapshots: \(error)")
+    }).disposed(by: disposeBag)
+    
+// Collection
+db.collection("cities")
+    .rx
+    .listen()
+    .subscribe(onNext: { snapshot in
+        snapshot.documentChanges.forEach { diff in
+            if (diff.type == .added) {
+                print("New city: \(diff.document.data())")
+            }
+            if (diff.type == .modified) {
+                print("Modified city: \(diff.document.data())")
+            }
+            if (diff.type == .removed) {
+                print("Removed city: \(diff.document.data())")
+            }
+        }
+    }, onError: { error in
+        print("Error fetching snapshots: \(error)")
+    }).disposed(by: disposeBag)
 
-        // https://firebase.google.com/docs/firestore/query-data/listen
+// https://firebase.google.com/docs/firestore/query-data/listen
 ```
 
 Batched writes
 ```swift
-        let db = Firestore.firestore()
+let db = Firestore.firestore()
 
-        // Get new write batch
-        let batch = db.batch()
-        
-        // Update the population of 'SF'
-        let sfRef = db.collection("cities").document("SF")
-        batch.updateData(["population": 1000000 ], forDocument: sfRef)
-        
-        // Commit the batch
-        batch.rx
-            .commit()
-            .subscribe(onNext: {
-                print("Batch write succeeded.")
-            }, onError: { error in
-                print("Error writing batch \(error)")
-            }).disposed(by: disposeBag)
-            
-        // https://firebase.google.com/docs/firestore/manage-data/transactions
+// Get new write batch
+let batch = db.batch()
+
+// Update the population of 'SF'
+let sfRef = db.collection("cities").document("SF")
+batch.updateData(["population": 1000000 ], forDocument: sfRef)
+
+// Commit the batch
+batch.rx
+    .commit()
+    .subscribe(onNext: {
+        print("Batch write succeeded.")
+    }, onError: { error in
+        print("Error writing batch \(error)")
+    }).disposed(by: disposeBag)
+    
+// https://firebase.google.com/docs/firestore/manage-data/transactions
 ```
 
 Transactions
 ```swift
-        let db = Firestore.firestore()
-        let sfReference = db.collection("cities").document("SF")
-        
-        db.rx.runTransaction { transaction, errorPointer in
-            let sfDocument: DocumentSnapshot
-            do {
-                try sfDocument = transaction.getDocument(sfReference)
-            } catch let fetchError as NSError {
-                errorPointer?.pointee = fetchError
-                return nil
-            }
-            
-            guard let oldPopulation = sfDocument.data()?["population"] as? Int else {
-                let error = NSError(
-                    domain: "AppErrorDomain",
-                    code: -1,
-                    userInfo: [
-                        NSLocalizedDescriptionKey: "Unable to retrieve population from snapshot \(sfDocument)"
-                    ]
-                )
-                errorPointer?.pointee = error
-                return nil
-            }
-            
-            transaction.updateData(["population": oldPopulation + 1], forDocument: sfReference)
-            return nil
-            }.subscribe(onNext: { _ in
-                print("Transaction successfully committed!")
-            }, onError: { error in
-                print("Transaction failed: \(error)")
-            }).disposed(by: disposeBag)
+let db = Firestore.firestore()
+let sfReference = db.collection("cities").document("SF")
+
+db.rx.runTransaction { transaction, errorPointer in
+    let sfDocument: DocumentSnapshot
+    do {
+        try sfDocument = transaction.getDocument(sfReference)
+    } catch let fetchError as NSError {
+        errorPointer?.pointee = fetchError
+        return nil
+    }
+    
+    guard let oldPopulation = sfDocument.data()?["population"] as? Int else {
+        let error = NSError(
+            domain: "AppErrorDomain",
+            code: -1,
+            userInfo: [
+                NSLocalizedDescriptionKey: "Unable to retrieve population from snapshot \(sfDocument)"
+            ]
+        )
+        errorPointer?.pointee = error
+        return nil
+    }
+    
+    transaction.updateData(["population": oldPopulation + 1], forDocument: sfReference)
+    return nil
+    }.subscribe(onNext: { _ in
+        print("Transaction successfully committed!")
+    }, onError: { error in
+        print("Transaction failed: \(error)")
+    }).disposed(by: disposeBag)
+    
+    // https://firebase.google.com/docs/firestore/manage-data/transactions
 ``
 
 ## Author