fix(swagger): fix the parsing of enum types with array (#4078)

packages/swagger/src/decorators/api-property.decorator.ts

@@ -45,7 +45,7 @@ export function createApiPropertyDecorator(
     options.type = getEnumType(enumValues);
   }
 
-  if (isArray) {
+  if (options.type !== 'array' && isArray) {
     options.type = 'array';
     options.items = {
       type: type as any,

packages/swagger/test/__snapshots__/parser.test.ts.snap

@@ -1350,6 +1350,26 @@ exports[`test @ApiParam should test with @Param decorator 1`] = `
 }
 `;
 
+exports[`test @ApiProperty should format enum type with array 1`] = `
+{
+  "properties": {
+    "animal": {
+      "isArray": true,
+      "items": {
+        "enum": [
+          0,
+          1,
+          2,
+        ],
+        "type": "number",
+      },
+      "type": "array",
+    },
+  },
+  "type": "object",
+}
+`;
+
 exports[`test @ApiProperty should parse base type 1`] = `
 {
   "properties": {

packages/swagger/test/parser.test.ts

@@ -1776,6 +1776,44 @@ describe('test @ApiProperty', () => {
     const explorer = new CustomSwaggerExplorer();
     expect(explorer.parse(Cat)).toMatchSnapshot();
   });
+
+  it('should format enum type with array', () => {
+    enum Animal {
+      Cat = 0,
+      Dog = 1,
+      Pig = 2,
+    }
+
+    class Dto {
+      @ApiProperty({
+        type: 'enum',
+        enum: Animal,
+        isArray: true,
+      })
+      animal: Animal[];
+    }
+
+    const explorer = new CustomSwaggerExplorer();
+    const result = explorer.parse(Dto)
+    // expect(explorer.parse(Dto)).toMatchSnapshot();
+    expect(result).toEqual({
+      properties: {
+        animal: {
+          isArray: true,
+          items: {
+            enum: [
+              0,
+              1,
+              2,
+            ],
+            type: 'number',
+          },
+          type: 'array',
+        },
+      },
+      type: 'object',
+    })
+  })
 });
 
 describe('test property metadata parse', () => {