diff --git a/src/P2S_Lib/redisdatastore.cpp b/src/P2S_Lib/redisdatastore.cpp
index adbef2a..93d3f95 100644
--- a/src/P2S_Lib/redisdatastore.cpp
+++ b/src/P2S_Lib/redisdatastore.cpp
@@ -16,14 +16,15 @@ void RedisDataStore::Put(string key, std::vector<json> changes)
     client.setnx(key, "{}");
     json collection = json::parse(this->GetSync(key));
     for(auto change : changes){
-        if(change["_delete"].get<bool>())
+        auto changeId = change["_id"].get<string>();
+        if(collection.count(changeId) != 0 && change["_delete"].get<bool>())
         {
-            collection.erase(change["_id"].get<string>());
+            collection.erase(changeId);
             continue;
         }
-        else if(collection.count("_id") == 0 || collection["_id"]["_mtime"].get<time_t>() < change["_mtime"].get<time_t>())
+        else if(collection.count(changeId) == 0 || collection[changeId]["_mtime"].get<time_t>() < change["_mtime"].get<time_t>())
         {
-            collection[change["_id"].get<string>()] = change;
+            collection[changeId] = change;
             continue;
         }
     }
diff --git a/test/P2S_Lib_Test/jsonrpcrequesttest.cpp b/test/P2S_Lib_Test/jsonrpcrequesttest.cpp
index 2ded589..f8fbb3d 100644
--- a/test/P2S_Lib_Test/jsonrpcrequesttest.cpp
+++ b/test/P2S_Lib_Test/jsonrpcrequesttest.cpp
@@ -1,15 +1,15 @@
 #include <gtest/gtest.h>
-#include <jsonrpcresponse.h>
+#include <jsonrpcrequest.h>
 
 using namespace P2S::Lib;
 
-TEST(RPCResponseTest, ValidJsonRpcResponseTest) {
-    ValidJsonRpcResponse response("it works", "10");
-    EXPECT_EQ("{\"id\":\"10\",\"jsonrpc\":\"2.0\",\"result\":\"it works\"}", response.Serialize());
+TEST(RPCRequestTest, ParseCorrectJsonRPC) {
+    JsonRpcRequest request;
+    ASSERT_NO_THROW(request.Deserialize("{\"jsonrpc\": \"2.0\", \"method\":\"example\", \"params\": [42], \"id\": 2}"));
 }
 
-TEST(RPCResponseTest, ErrorJsonRpcResponseTest) {
-    ErrorJsonRpcResponse response(-32700,"Parse Error", "10");
-    EXPECT_EQ("{\"error\":{\"code\":-32700,\"data\":\"\",\"message\":\"Parse Error\"},\"id\":\"10\",\"jsonrpc\":\"2.0\"}", response.Serialize());
+TEST(RPCRequestTest, ParseIncorrectJsonRPC) {
+    JsonRpcRequest request;
+    ASSERT_ANY_THROW(request.Deserialize("{\"jsonrpc\": \"2.0\".... \"method\":\"example\", \"id\": 2}"));
 }
 
diff --git a/test/P2S_Lib_Test/jsonrpcresponsetest.cpp b/test/P2S_Lib_Test/jsonrpcresponsetest.cpp
index ee91830..c2d5e07 100644
--- a/test/P2S_Lib_Test/jsonrpcresponsetest.cpp
+++ b/test/P2S_Lib_Test/jsonrpcresponsetest.cpp
@@ -1,14 +1,14 @@
 #include <gtest/gtest.h>
-#include <jsonrpcrequest.h>
+#include <jsonrpcresponse.h>
 
 using namespace P2S::Lib;
 
-TEST(RPCRequestTest, ParseCorrectJsonRPC) {
-    JsonRpcRequest request;
-    ASSERT_NO_THROW(request.Deserialize("{\"jsonrpc\": \"2.0\", \"method\":\"example\", \"params\": [42], \"id\": 2}"));
+TEST(RPCResponseTest, ValidJsonRpcResponseTest) {
+    ValidJsonRpcResponse response("it works", "10");
+    EXPECT_EQ("{\"id\":\"10\",\"jsonrpc\":\"2.0\",\"result\":\"it works\"}", response.Serialize());
 }
 
-TEST(RPCRequestTest, ParseIncorrectJsonRPC) {
-    JsonRpcRequest request;
-    ASSERT_ANY_THROW(request.Deserialize("{\"jsonrpc\": \"2.0\".... \"method\":\"example\", \"id\": 2}"));
+TEST(RPCResponseTest, ErrorJsonRpcResponseTest) {
+    ErrorJsonRpcResponse response(-32700,"Parse Error", "10");
+    EXPECT_EQ("{\"error\":{\"code\":-32700,\"data\":\"\",\"message\":\"Parse Error\"},\"id\":\"10\",\"jsonrpc\":\"2.0\"}", response.Serialize());
 }
diff --git a/test/Test_P2S_Postman.json b/test/Test_P2S_Postman.json
index e85cffd..09b7d40 100644
--- a/test/Test_P2S_Postman.json
+++ b/test/Test_P2S_Postman.json
@@ -92,7 +92,65 @@
 						],
 						"body": {
 							"mode": "raw",
-							"raw": "{\"jsonrpc\": \"2.0\", \"method\":\"datastorePut\", \"params\": {\"collection\": \"testCollection\", \"changes\": [{ \"_id\": \"troloro12345\", \"_mtime\": 12345, \"_delete\": false}, { \"_id\": \"troloro123456\", \"_mtime\": 12345, \"_delete\": false}] }, \"id\": 2}"
+							"raw": "{\"jsonrpc\": \"2.0\", \"method\":\"datastorePut\", \"params\": {\"collection\": \"testCollection\", \"changes\": [{ \"_id\": \"troloro12345\", \"_mtime\": 12345, \"_delete\": false}, { \"_id\": \"troloro123456\", \"_mtime\": 12345, \"_delete\": false}, { \"_id\": \"troloro1234567\", \"_mtime\": 12345, \"_delete\": false}] }, \"id\": 2}"
+						},
+						"description": ""
+					},
+					"response": []
+				},
+				{
+					"name": "put remove",
+					"event": [
+						{
+							"listen": "test",
+							"script": {
+								"type": "text/javascript",
+								"exec": "var expected = '{\"id\":\"2\",\"jsonrpc\":\"2.0\",\"result\":\"\"}'\ntests[\"Body is response\"] = responseBody === expected;"
+							}
+						}
+					],
+					"request": {
+						"url": "http://localhost:8080/rpc",
+						"method": "POST",
+						"header": [
+							{
+								"key": "Content-Type",
+								"value": "application/json",
+								"description": ""
+							}
+						],
+						"body": {
+							"mode": "raw",
+							"raw": "{\"jsonrpc\": \"2.0\", \"method\":\"datastorePut\", \"params\": {\"collection\": \"testCollection\", \"changes\": [{ \"_id\": \"troloro1234567\", \"_mtime\": 1234578, \"_delete\": true}] }, \"id\": 2}"
+						},
+						"description": ""
+					},
+					"response": []
+				},
+				{
+					"name": "put edit",
+					"event": [
+						{
+							"listen": "test",
+							"script": {
+								"type": "text/javascript",
+								"exec": "var expected = '{\"id\":\"2\",\"jsonrpc\":\"2.0\",\"result\":\"\"}'\ntests[\"Body is response\"] = responseBody === expected;"
+							}
+						}
+					],
+					"request": {
+						"url": "http://localhost:8080/rpc",
+						"method": "POST",
+						"header": [
+							{
+								"key": "Content-Type",
+								"value": "application/json",
+								"description": ""
+							}
+						],
+						"body": {
+							"mode": "raw",
+							"raw": "{\"jsonrpc\": \"2.0\", \"method\":\"datastorePut\", \"params\": {\"collection\": \"testCollection\", \"changes\": [{ \"_id\": \"troloro123456\", \"_mtime\": 12345789, \"_delete\": false, \"data\": \"this is attached information\"}] }, \"id\": 2}"
 						},
 						"description": ""
 					},
@@ -169,7 +227,7 @@
 							"listen": "test",
 							"script": {
 								"type": "text/javascript",
-								"exec": "var expected = '{\"id\":\"2\",\"jsonrpc\":\"2.0\",\"result\":\"[{\\\\\"_delete\\\\\":false,\\\\\"_id\\\\\":\\\\\"troloro12345\\\\\",\\\\\"_mtime\\\\\":12345},{\\\\\"_delete\\\\\":false,\\\\\"_id\\\\\":\\\\\"troloro123456\\\\\",\\\\\"_mtime\\\\\":12345}]\"}'\ntests[\"Body is response\"] = responseBody === expected;"
+								"exec": "var expected = '{\"id\":\"2\",\"jsonrpc\":\"2.0\",\"result\":\"[{\\\\\"_delete\\\\\":false,\\\\\"_id\\\\\":\\\\\"troloro12345\\\\\",\\\\\"_mtime\\\\\":12345},{\\\\\"_delete\\\\\":false,\\\\\"_id\\\\\":\\\\\"troloro123456\\\\\",\\\\\"_mtime\\\\\":12345789,\\\\\"data\\\\\":\\\\\"this is attached information\\\\\"}]\"}'\ntests[\"Body is response\"] = responseBody === expected;"
 							}
 						}
 					],
@@ -262,7 +320,7 @@
 							"listen": "test",
 							"script": {
 								"type": "text/javascript",
-								"exec": "var expected = '{\"id\":\"2\",\"jsonrpc\":\"2.0\",\"result\":\"[{\\\\\"id\\\\\":\\\\\"troloro12345\\\\\",\\\\\"mtime\\\\\":12345},{\\\\\"id\\\\\":\\\\\"troloro123456\\\\\",\\\\\"mtime\\\\\":12345}]\"}'\ntests[\"Body is response\"] = responseBody === expected;"
+								"exec": "var expected = '{\"id\":\"2\",\"jsonrpc\":\"2.0\",\"result\":\"[{\\\\\"id\\\\\":\\\\\"troloro12345\\\\\",\\\\\"mtime\\\\\":12345},{\\\\\"id\\\\\":\\\\\"troloro123456\\\\\",\\\\\"mtime\\\\\":12345789}]\"}'\ntests[\"Body is response\"] = responseBody === expected;"
 							}
 						}
 					],