diff --git a/.graphqlconfig.yml b/.graphqlconfig.yml
index 5c3ce02..18aaa43 100644
--- a/.graphqlconfig.yml
+++ b/.graphqlconfig.yml
@@ -10,3 +10,6 @@ projects:
         codeGenTarget: javascript
         generatedFileName: ''
         docsFilePath: src/graphql
+extensions:
+  amplify:
+    version: 3
diff --git a/amplify/backend/api/amplifydsvue/schema.graphql b/amplify/backend/api/amplifydsvue/schema.graphql
index 0646105..a617d70 100644
--- a/amplify/backend/api/amplifydsvue/schema.graphql
+++ b/amplify/backend/api/amplifydsvue/schema.graphql
@@ -1,6 +1,7 @@
 type Chatty @model {
   id: ID!
   user: String!
+  rate: Int!
   message: String!
   createdAt: AWSDateTime
 }
\ No newline at end of file
diff --git a/src/HelloWorld.vue b/src/HelloWorld.vue
index 2163a4d..03da2f2 100644
--- a/src/HelloWorld.vue
+++ b/src/HelloWorld.vue
@@ -1,12 +1,13 @@
 <template>
   <div>
     <form v-on:submit.prevent>
+      <input v-model="form.rate" />
       <input v-model="form.message" />
       <button @click="sendMessage">Send</button>
     </form>
 
     <div v-for="message of sorted" :key="message.id">
-      <div>{{ message.message }} {{ message.user }} - {{ message.createdAt }}</div>
+      <div>{{ message.rate }} {{ message.message }} {{ message.user }} - {{ message.createdAt }}</div>
     </div>
 
     <button @click="allDel">Delete all messages.</button>
@@ -15,9 +16,17 @@
 </template>
 <script>
 import { Auth } from "aws-amplify";
-import { DataStore, Predicates } from "@aws-amplify/datastore";
+import { DataStore, Predicates, syncExpression } from "@aws-amplify/datastore";
 import { Chatty } from "./models";
 
+DataStore.configure({
+  syncExpressions: [
+    syncExpression(Chatty, () => {
+      return (c) => c.rate('gt', 5).rate('lt', 7);
+    }),
+  ]
+});
+
 export default {
   name: 'app',
   data() {
@@ -47,9 +56,10 @@ export default {
   },
   methods: {
     sendMessage() {
-      const { message } = this.form
-      if (!message) return;
+      const { rate, message } = this.form
+      if (!rate || !message) return;
       DataStore.save(new Chatty({
+        rate: Number(rate),
         user: this.user.username,
         message: message,
         createdAt: new Date().toISOString()
diff --git a/src/graphql/mutations.js b/src/graphql/mutations.js
index aac9f4a..69a1e72 100644
--- a/src/graphql/mutations.js
+++ b/src/graphql/mutations.js
@@ -9,6 +9,7 @@ export const createChatty = /* GraphQL */ `
     createChatty(input: $input, condition: $condition) {
       id
       user
+      rate
       message
       createdAt
       _version
@@ -26,6 +27,7 @@ export const updateChatty = /* GraphQL */ `
     updateChatty(input: $input, condition: $condition) {
       id
       user
+      rate
       message
       createdAt
       _version
@@ -43,6 +45,7 @@ export const deleteChatty = /* GraphQL */ `
     deleteChatty(input: $input, condition: $condition) {
       id
       user
+      rate
       message
       createdAt
       _version
diff --git a/src/graphql/queries.js b/src/graphql/queries.js
index b9ae8e3..9f9d761 100644
--- a/src/graphql/queries.js
+++ b/src/graphql/queries.js
@@ -17,6 +17,7 @@ export const syncChatties = /* GraphQL */ `
       items {
         id
         user
+        rate
         message
         createdAt
         _version
@@ -34,6 +35,7 @@ export const getChatty = /* GraphQL */ `
     getChatty(id: $id) {
       id
       user
+      rate
       message
       createdAt
       _version
@@ -53,6 +55,7 @@ export const listChattys = /* GraphQL */ `
       items {
         id
         user
+        rate
         message
         createdAt
         _version
diff --git a/src/graphql/schema.json b/src/graphql/schema.json
index 28bf1e6..05d9908 100644
--- a/src/graphql/schema.json
+++ b/src/graphql/schema.json
@@ -208,6 +208,21 @@
           },
           "isDeprecated" : false,
           "deprecationReason" : null
+        }, {
+          "name" : "rate",
+          "description" : null,
+          "args" : [ ],
+          "type" : {
+            "kind" : "NON_NULL",
+            "name" : null,
+            "ofType" : {
+              "kind" : "SCALAR",
+              "name" : "Int",
+              "ofType" : null
+            }
+          },
+          "isDeprecated" : false,
+          "deprecationReason" : null
         }, {
           "name" : "message",
           "description" : null,
@@ -315,8 +330,8 @@
         "possibleTypes" : null
       }, {
         "kind" : "SCALAR",
-        "name" : "AWSDateTime",
-        "description" : "The `AWSDateTime` scalar type provided by AWS AppSync, represents a valid ***extended*** [ISO 8601 DateTime](https://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations) string. In other words, this scalar type accepts datetime strings of the form `YYYY-MM-DDThh:mm:ss.SSSZ`.  The scalar can also accept \"negative years\" of the form `-YYYY` which correspond to years before `0000`. For example, \"**-2017-01-01T00:00Z**\" and \"**-9999-01-01T00:00Z**\" are both valid datetime strings.  The field after the two digit seconds field is a nanoseconds field. It can accept between 1 and 9 digits. So, for example, \"**1970-01-01T12:00:00.2Z**\", \"**1970-01-01T12:00:00.277Z**\" and \"**1970-01-01T12:00:00.123456789Z**\" are all valid datetime strings.  The seconds and nanoseconds fields are optional (the seconds field must be specified if the nanoseconds field is to be used).  The [time zone offset](https://en.wikipedia.org/wiki/ISO_8601#Time_zone_designators) is compulsory for this scalar. The time zone offset must either be `Z` (representing the UTC time zone) or be in the format `±hh:mm:ss`. The seconds field in the timezone offset will be considered valid even though it is not part of the ISO 8601 standard.",
+        "name" : "Int",
+        "description" : "Built-in Int",
         "fields" : null,
         "inputFields" : null,
         "interfaces" : null,
@@ -324,8 +339,8 @@
         "possibleTypes" : null
       }, {
         "kind" : "SCALAR",
-        "name" : "Int",
-        "description" : "Built-in Int",
+        "name" : "AWSDateTime",
+        "description" : "The `AWSDateTime` scalar type provided by AWS AppSync, represents a valid ***extended*** [ISO 8601 DateTime](https://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations) string. In other words, this scalar type accepts datetime strings of the form `YYYY-MM-DDThh:mm:ss.SSSZ`.  The scalar can also accept \"negative years\" of the form `-YYYY` which correspond to years before `0000`. For example, \"**-2017-01-01T00:00Z**\" and \"**-9999-01-01T00:00Z**\" are both valid datetime strings.  The field after the two digit seconds field is a nanoseconds field. It can accept between 1 and 9 digits. So, for example, \"**1970-01-01T12:00:00.2Z**\", \"**1970-01-01T12:00:00.277Z**\" and \"**1970-01-01T12:00:00.123456789Z**\" are all valid datetime strings.  The seconds and nanoseconds fields are optional (the seconds field must be specified if the nanoseconds field is to be used).  The [time zone offset](https://en.wikipedia.org/wiki/ISO_8601#Time_zone_designators) is compulsory for this scalar. The time zone offset must either be `Z` (representing the UTC time zone) or be in the format `±hh:mm:ss`. The seconds field in the timezone offset will be considered valid even though it is not part of the ISO 8601 standard.",
         "fields" : null,
         "inputFields" : null,
         "interfaces" : null,
@@ -372,6 +387,15 @@
             "ofType" : null
           },
           "defaultValue" : null
+        }, {
+          "name" : "rate",
+          "description" : null,
+          "type" : {
+            "kind" : "INPUT_OBJECT",
+            "name" : "ModelIntInput",
+            "ofType" : null
+          },
+          "defaultValue" : null
         }, {
           "name" : "message",
           "description" : null,
@@ -824,6 +848,100 @@
         "interfaces" : null,
         "enumValues" : null,
         "possibleTypes" : null
+      }, {
+        "kind" : "INPUT_OBJECT",
+        "name" : "ModelIntInput",
+        "description" : null,
+        "fields" : null,
+        "inputFields" : [ {
+          "name" : "ne",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "eq",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "le",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "lt",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "ge",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "gt",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "between",
+          "description" : null,
+          "type" : {
+            "kind" : "LIST",
+            "name" : null,
+            "ofType" : {
+              "kind" : "SCALAR",
+              "name" : "Int",
+              "ofType" : null
+            }
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "attributeExists",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Boolean",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        }, {
+          "name" : "attributeType",
+          "description" : null,
+          "type" : {
+            "kind" : "ENUM",
+            "name" : "ModelAttributeTypes",
+            "ofType" : null
+          },
+          "defaultValue" : null
+        } ],
+        "interfaces" : null,
+        "enumValues" : null,
+        "possibleTypes" : null
       }, {
         "kind" : "OBJECT",
         "name" : "Mutation",
@@ -959,6 +1077,19 @@
             }
           },
           "defaultValue" : null
+        }, {
+          "name" : "rate",
+          "description" : null,
+          "type" : {
+            "kind" : "NON_NULL",
+            "name" : null,
+            "ofType" : {
+              "kind" : "SCALAR",
+              "name" : "Int",
+              "ofType" : null
+            }
+          },
+          "defaultValue" : null
         }, {
           "name" : "message",
           "description" : null,
@@ -1008,6 +1139,15 @@
             "ofType" : null
           },
           "defaultValue" : null
+        }, {
+          "name" : "rate",
+          "description" : null,
+          "type" : {
+            "kind" : "INPUT_OBJECT",
+            "name" : "ModelIntInput",
+            "ofType" : null
+          },
+          "defaultValue" : null
         }, {
           "name" : "message",
           "description" : null,
@@ -1092,6 +1232,15 @@
             "ofType" : null
           },
           "defaultValue" : null
+        }, {
+          "name" : "rate",
+          "description" : null,
+          "type" : {
+            "kind" : "SCALAR",
+            "name" : "Int",
+            "ofType" : null
+          },
+          "defaultValue" : null
         }, {
           "name" : "message",
           "description" : null,
@@ -1340,100 +1489,6 @@
         "interfaces" : null,
         "enumValues" : null,
         "possibleTypes" : null
-      }, {
-        "kind" : "INPUT_OBJECT",
-        "name" : "ModelIntInput",
-        "description" : null,
-        "fields" : null,
-        "inputFields" : [ {
-          "name" : "ne",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Int",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "eq",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Int",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "le",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Int",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "lt",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Int",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "ge",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Int",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "gt",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Int",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "between",
-          "description" : null,
-          "type" : {
-            "kind" : "LIST",
-            "name" : null,
-            "ofType" : {
-              "kind" : "SCALAR",
-              "name" : "Int",
-              "ofType" : null
-            }
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "attributeExists",
-          "description" : null,
-          "type" : {
-            "kind" : "SCALAR",
-            "name" : "Boolean",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        }, {
-          "name" : "attributeType",
-          "description" : null,
-          "type" : {
-            "kind" : "ENUM",
-            "name" : "ModelAttributeTypes",
-            "ofType" : null
-          },
-          "defaultValue" : null
-        } ],
-        "interfaces" : null,
-        "enumValues" : null,
-        "possibleTypes" : null
       }, {
         "kind" : "ENUM",
         "name" : "ModelSortDirection",
diff --git a/src/graphql/subscriptions.js b/src/graphql/subscriptions.js
index e81f0c6..611be01 100644
--- a/src/graphql/subscriptions.js
+++ b/src/graphql/subscriptions.js
@@ -6,6 +6,7 @@ export const onCreateChatty = /* GraphQL */ `
     onCreateChatty {
       id
       user
+      rate
       message
       createdAt
       _version
@@ -20,6 +21,7 @@ export const onUpdateChatty = /* GraphQL */ `
     onUpdateChatty {
       id
       user
+      rate
       message
       createdAt
       _version
@@ -34,6 +36,7 @@ export const onDeleteChatty = /* GraphQL */ `
     onDeleteChatty {
       id
       user
+      rate
       message
       createdAt
       _version
diff --git a/src/models/index.d.ts b/src/models/index.d.ts
index 0ae7a20..52afc37 100644
--- a/src/models/index.d.ts
+++ b/src/models/index.d.ts
@@ -7,6 +7,7 @@ import { ModelInit, MutableModel, PersistentModelConstructor } from "@aws-amplif
 export declare class Chatty {
   readonly id: string;
   readonly user: string;
+  readonly rate: number;
   readonly message: string;
   readonly createdAt?: string;
   constructor(init: ModelInit<Chatty>);
diff --git a/src/models/schema.js b/src/models/schema.js
index b52626b..c179267 100644
--- a/src/models/schema.js
+++ b/src/models/schema.js
@@ -17,6 +17,13 @@ export const schema = {
                     "isRequired": true,
                     "attributes": []
                 },
+                "rate": {
+                    "name": "rate",
+                    "isArray": false,
+                    "type": "Int",
+                    "isRequired": true,
+                    "attributes": []
+                },
                 "message": {
                     "name": "message",
                     "isArray": false,
@@ -44,5 +51,5 @@ export const schema = {
     },
     "enums": {},
     "nonModels": {},
-    "version": "e552f24548a5055814c8abdba97ada0b"
+    "version": "9be9ec15472c7bd08c3a9c028964b553"
 };
\ No newline at end of file