diff --git a/src/Engine.ts b/src/Engine.ts
index af444af..687d26b 100644
--- a/src/Engine.ts
+++ b/src/Engine.ts
@@ -288,6 +288,9 @@ function createHandlebarsHelpers(generationOptions: IGenerationOptions) {
     Handlebars.registerHelper("tolowerCaseFirst", str =>
         changeCase.lowerCaseFirst(str)
     );
+    Handlebars.registerHelper("strictMode", () =>
+        generationOptions.strictMode ? generationOptions.strictMode : ""
+    );
     Handlebars.registerHelper("toLazy", str => {
         if (generationOptions.lazy) {
             return `Promise<${str}>`;
diff --git a/src/IGenerationOptions.ts b/src/IGenerationOptions.ts
index 94f8750..9b64956 100644
--- a/src/IGenerationOptions.ts
+++ b/src/IGenerationOptions.ts
@@ -22,5 +22,7 @@ export default class IGenerationOptions {
 
     public relationIds: boolean = false;
 
+    public strictMode: false | "?" | "!" = false;
+
     public skipSchema: boolean = false;
 }
diff --git a/src/entity.mst b/src/entity.mst
index c474516..04c5aa8 100644
--- a/src/entity.mst
+++ b/src/entity.mst
@@ -24,21 +24,22 @@ import {BaseEntity,Column,Entity,Index,JoinColumn,JoinTable,ManyToMany,ManyToOne
         array:{{array}},{{/array}}
         name:"{{name}}"
         }){{/options}}
-    {{printPropertyVisibility}}{{toPropertyName tsName}}:{{tsType}}{{#options/nullable}} | null{{/options/nullable}};
+    {{printPropertyVisibility}}{{toPropertyName tsName}}{{strictMode}}:{{tsType}}{{#options/nullable}} | null{{/options/nullable}};
         {{/relations}}{{#relations}}
-    @{{relationType}}(()=>{{toEntityName relatedTable}}, {{tolowerCaseFirst relatedTable}}=>{{tolowerCaseFirst relatedTable}}.{{#if isOwner}}{{toPropertyName ownerColumn}},{ {{#../options/primary}}primary:true,{{/../options/primary}}{{^../options/nullable}} nullable:false,{{/../options/nullable}}{{#actionOnDelete}}onDelete: '{{.}}',{{/actionOnDelete}}{{#actionOnUpdate}}onUpdate: '{{.}}'{{/actionOnUpdate}} }{{else}}{{toPropertyName relatedColumn}}{{#if (or actionOnDelete actionOnUpdate ) }},{ {{#actionOnDelete}}onDelete: '{{.}}' ,{{/actionOnDelete}}{{#actionOnUpdate}}onUpdate: '{{.}}'{{/actionOnUpdate}} }{{/if}}{{/if}}){{#isOwner}}
+    @{{relationType}}(()=>{{toEntityName relatedTable}}, ({{toPropertyName relatedTable}}: {{toEntityName relatedTable}})=>{{toPropertyName relatedTable}}.{{#if isOwner}}{{toPropertyName ownerColumn}},{ {{#../options/primary}}primary:true,{{/../options/primary}}{{^../options/nullable}} nullable:false,{{/../options/nullable}}{{#actionOnDelete}}onDelete: '{{.}}',{{/actionOnDelete}}{{#actionOnUpdate}}onUpdate: '{{.}}'{{/actionOnUpdate}} }{{else}}{{toPropertyName relatedColumn}}{{#if (or actionOnDelete actionOnUpdate ) }},{ {{#actionOnDelete}}onDelete: '{{.}}' ,{{/actionOnDelete}}{{#actionOnUpdate}}onUpdate: '{{.}}'{{/actionOnUpdate}} }{{/if}}{{/if}}){{#isOwner}}
     {{#if isManyToMany}}@JoinTable({ name:'{{ ../options/name}}'}){{else}}@JoinColumn({ name:'{{ ../options/name}}'}){{/if}}{{/isOwner}}
-    {{#if (or isOneToMany isManyToMany)}}{{printPropertyVisibility}}{{toPropertyName ../tsName}}:{{toLazy (concat  (toEntityName relatedTable) "[]")}};
-    {{else}}{{printPropertyVisibility}}{{toPropertyName ../tsName}}:{{toLazy (concat (toEntityName relatedTable) ' | null')}};
+    {{#if (or isOneToMany isManyToMany)}}{{printPropertyVisibility}}{{toPropertyName ../tsName}}{{strictMode}}:{{toLazy (concat  (toEntityName relatedTable) "[]")}};
+    {{else}}{{printPropertyVisibility}}{{toPropertyName ../tsName}}{{strictMode}}:{{toLazy (concat (toEntityName relatedTable) ' | null')}};
     {{/if}}
     {{#if relationIdField }}
 
     @RelationId(({{toPropertyName ../../tsEntityName}}: {{toEntityName ../../tsEntityName}}) => {{toEntityName ../../tsEntityName}}.{{toPropertyName ../tsName}})
-    {{printPropertyVisibility}}{{toPropertyName ../tsName}}Id: {{#if isOneToOne}}{{toLazy ../tsType}}{{else}}{{toLazy (concat  ../tsType "[]")}}{{/if}};{{/if}}{{/relations}}
+    {{printPropertyVisibility}}{{toPropertyName ../tsName}}Id{{strictMode}}: {{#if isOneToOne}}{{toLazy ../tsType}}{{else}}{{toLazy (concat  ../tsType "[]")}}{{/if}};{{/if}}{{/relations}}
     {{/Columns}}
     {{#if GenerateConstructor}}
     {{printPropertyVisibility}}constructor(init?: Partial<{{toEntityName tsEntityName}}>) {
-		Object.assign(this, init);
+        {{#IsActiveRecord}}super();
+        {{/IsActiveRecord}}Object.assign(this, init);
 	}
     {{/if}}
 }
diff --git a/src/index.ts b/src/index.ts
index 85a8758..ada1ac9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -163,6 +163,11 @@ function GetUtilParametersByArgs() {
             default: false,
             describe: "Generate constructor allowing partial initialization"
         })
+        .option("strictMode", {
+            choices: ["none", "?", "!"],
+            default: "none",
+            describe: "Mark fields as optional(?) or non-null(!)"
+        })
         .option("timeout", {
             describe: "SQL Query timeout(ms)",
             number: true
@@ -201,6 +206,9 @@ function GetUtilParametersByArgs() {
     generationOptions.relationIds = argv.relationIds;
     generationOptions.skipSchema = argv.skipSchema;
     generationOptions.resultsPath = argv.o ? argv.o.toString() : null;
+    generationOptions.strictMode =
+        argv.strictMode === "none" ? false : argv.strictMode;
+
     return { driver, connectionOptions, generationOptions };
 }
 
@@ -399,6 +407,18 @@ async function GetUtilParametersByInquirer() {
             }
         ])) as any).propertyVisibility;
 
+        const { strictModeRaw } = (await inquirer.prompt([
+            {
+                choices: ["none", "?", "!"],
+                message: "Mark fields as optional(?) or non-null(!)",
+                name: "strictModeRaw",
+                default: "none",
+                type: "list"
+            }
+        ])) as any;
+
+        generationOptions.strictMode =
+            strictModeRaw === "none" ? false : strictModeRaw;
         generationOptions.noConfigs = !customizations.includes("config");
         generationOptions.lazy = customizations.includes("lazy");
         generationOptions.activeRecord = customizations.includes(
diff --git a/test/utils/GeneralTestUtils.ts b/test/utils/GeneralTestUtils.ts
index c3981d9..8c4af84 100644
--- a/test/utils/GeneralTestUtils.ts
+++ b/test/utils/GeneralTestUtils.ts
@@ -24,7 +24,8 @@ export function getGenerationOptions(resultsPath: string): IGenerationOptions {
         customNamingStrategyPath: "",
         relationIds: false,
         skipSchema: false,
-        activeRecord: false
+        activeRecord: false,
+        strictMode: false
     };
 }