add JsonColumn

src/decorators/property.ts

@@ -12,6 +12,7 @@ import {
   IsString,
   MaxLength,
   Min,
+  ValidateNested,
 } from 'class-validator';
 import {
   WithPrecisionColumnType,
@@ -19,9 +20,14 @@ import {
 } from 'typeorm/driver/types/ColumnTypes';
 import { ColumnWithWidthOptions } from 'typeorm/decorator/options/ColumnWithWidthOptions';
 import { ColumnNumericOptions } from 'typeorm/decorator/options/ColumnNumericOptions';
-import { Exclude, Transform } from 'class-transformer';
+import { Exclude, Transform, Type } from 'class-transformer';
 import { BigintTransformer } from '../utility/bigint';
 import { Metadata } from '../utility/metadata';
+import {
+  ClassOrArray,
+  getClassFromClassOrArray,
+  ParseType,
+} from '../utility/insert-field';
 
 export interface OpenAPIOptions<T> {
   description?: string;
@@ -190,6 +196,21 @@ export const BoolColumn = (
     swaggerDecorator(options, { type: Boolean }),
   ]);
 
+export const JsonColumn = <C extends ClassOrArray>(
+  definition: C,
+  options: PropertyOptions<ParseType<C>> = {},
+): PropertyDecorator => {
+  const cl = getClassFromClassOrArray(definition);
+  return MergePropertyDecorators([
+    Index(),
+    Type(() => cl),
+    ValidateNested(),
+    Column('jsonb', columnDecoratorOptions(options)),
+    validatorDecorator(options),
+    swaggerDecorator(options, { type: definition }),
+  ]);
+};
+
 export const NotColumn = (
   options: OpenAPIOptions<any> = {},
 ): PropertyDecorator =>

src/utility/insert-field.ts

@@ -30,6 +30,14 @@ type TypeFromInsertOptions<O extends InsertOptions> = O extends InsertOptions<
       | (O extends { options: { required: true } } ? never : undefined)
   : never;
 
+type Merge<T, U> = {
+  [K in keyof T | keyof U]: K extends keyof T
+    ? T[K]
+    : K extends keyof U
+    ? U[K]
+    : never;
+};
+
 export function InsertField<
   C extends AnyClass,
   M extends Record<string, InsertOptions>,
@@ -37,9 +45,12 @@ export function InsertField<
   cl: C,
   map: M,
   newName?: string,
-): new (...args: ParamsFromClass<C>) => TypeFromClass<C> & {
-  [F in keyof M]: TypeFromInsertOptions<M[F]>;
-} {
+): new (...args: ParamsFromClass<C>) => Merge<
+  {
+    [F in keyof M]: TypeFromInsertOptions<M[F]>;
+  },
+  TypeFromClass<C>
+> {
   const extendedCl = class extends cl {};
   for (const key in map) {
     ApiProperty({