SWIFT-642 Update examples to use the new BSON API (#340)

Author: patrickfreed

Examples/Docs/Sources/DocsExamples/main.swift

@@ -6,7 +6,7 @@ import MongoSwift
 /// Examples used for the MongoDB documentation on Causal Consistency.
 /// - SeeAlso: https://docs.mongodb.com/manual/core/read-isolation-consistency-recency/#examples
 private func causalConsistency() throws {
-    let client1 = try MongoClient()
+    let client1 = try SyncMongoClient()
 
     // Start Causal Consistency Example 1
     let s1 = try client1.startSession(options: ClientSessionOptions(causalConsistency: true))
@@ -17,14 +17,14 @@ private func causalConsistency() throws {
     )
     let items = client1.db("test", options: dbOptions).collection("items")
     try items.updateOne(
-        filter: ["sku": "111", "end": BSONNull()],
-        update: ["$set": ["end": currentDate] as Document],
+        filter: ["sku": "111", "end": .null],
+        update: ["$set": ["end": .datetime(currentDate)]],
         session: s1
     )
-    try items.insertOne(["sku": "nuts-111", "name": "Pecans", "start": currentDate], session: s1)
+    try items.insertOne(["sku": "nuts-111", "name": "Pecans", "start": .datetime(currentDate)], session: s1)
     // End Causal Consistency Example 1
 
-    let client2 = try MongoClient()
+    let client2 = try SyncMongoClient()
 
     // Start Causal Consistency Example 2
     try client2.withSession(options: ClientSessionOptions(causalConsistency: true)) { s2 in
@@ -34,7 +34,7 @@ private func causalConsistency() throws {
 
         dbOptions.readPreference = ReadPreference(.secondary)
         let items2 = client2.db("test", options: dbOptions).collection("items")
-        for item in try items2.find(["end": BSONNull()], session: s2) {
+        for item in try items2.find(["end": .null], session: s2) {
             print(item)
         }
     }
@@ -44,7 +44,7 @@ private func causalConsistency() throws {
 /// Examples used for the MongoDB documentation on Change Streams.
 /// - SeeAlso: https://docs.mongodb.com/manual/changeStreams/
 private func changeStreams() throws {
-    let client = try MongoClient()
+    let client = try SyncMongoClient()
     let db = client.db("example")
 
     // The following examples assume that you have connected to a MongoDB replica set and have
@@ -81,8 +81,8 @@ private func changeStreams() throws {
     do {
         // Start Changestream Example 4
         let pipeline: [Document] = [
-            ["$match": ["fullDocument.username": "alice"] as Document],
-            ["$addFields": ["newField": "this is an added field!"] as Document]
+            ["$match": ["fullDocument.username": "alice"]],
+            ["$addFields": ["newField": "this is an added field!"]]
         ]
         let inventory = db.collection("inventory")
         let cursor = try inventory.watch(pipeline, withEventType: Document.self)

README.md

@@ -91,7 +91,7 @@ Note: we have included the client `connectionString` parameter for clarity, but
 ```swift
 let doc: Document = ["_id": 100, "a": 1, "b": 2, "c": 3]
 let result = try collection.insertOne(doc)
-print(result?.insertedId ?? "") // prints `100`
+print(result?.insertedId ?? "") // prints `.int64(100)`
 ```
 
 ### Find Documents
@@ -108,27 +108,27 @@ for d in documents {
 var doc: Document = ["a": 1, "b": 2, "c": 3]
 
 print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3}`
-print(doc["a"] ?? "") // prints `1`
+print(doc["a"] ?? "") // prints `.int64(1)`
 
 // Set a new value
 doc["d"] = 4
 print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3, "d" : 4}`
 
 // Using functional methods like map, filter:
 let evensDoc = doc.filter { elem in
-    guard let value = elem.value as? Int else {
+    guard let value = elem.value.asInt() else {
         return false
     }
     return value % 2 == 0
 }
 print(evensDoc) // prints `{ "b" : 2, "d" : 4 }`
 
 let doubled = doc.map { elem -> Int in
-    guard let value = elem.value as? Int else {
+    guard case let value = .int64(value) else {
         return 0
     }
 
-    return value * 2
+    return Int(value * 2)
 }
 print(doubled) // prints `[2, 4, 6, 8]`
 ```