Update enums schema from OpenAPI 2.0 to OpenAPI 3.0

[darrenchang]

• The property method Argument.__schema__ creates the wrong OpenAPI 3.0 schema for enums.
  https://github.com/darrenchang/flask-restx/blob/master/flask_restx/reqparse.py
• OpenAPI 3.0 enums doc https://swagger.io/docs/specification/data-models/enums/

Expected Behavior

"parameters": [
        {
          "in": "formData",
          "name": "file",
          "required": true,
          "type": "file"
        },
        {
          "collectionFormat": "csv",
          "in": "formData",
          "items": {
            "enum": [
              "item1",
              "item2",
              "item3",
            ],
            "type": "string"
          },
          "name": "picked_items",
          "type": "array"
        },

Actual Behavior

"parameters": [
        {
          "in": "formData",
          "name": "file",
          "required": true,
          "type": "file"
        },
        {
          "collectionFormat": "csv",
          "enum": [
            "item1",
            "item2",
            "item3",
          ],
          "in": "formData",
          "items": {
            "type": "string"
          },
          "name": "picked_items",
          "type": "array"
        },

Environment

• Python==3.10.11
• Flask==2.2.2
• Flask-RESTX==1.2.0

[peter-doggart]

Flask-restx generates Swagger 2.0 (https://swagger.io/specification/v2/) compliant docs only. Unfortunately, OpenAPI 3.0 support has been on the ask list for a long time but because of the way schemas are generated it's not a small change.

[darrenchang]

Flask-restx generates Swagger 2.0 (https://swagger.io/specification/v2/) compliant docs only. Unfortunately, OpenAPI 3.0 support has been on the ask list for a long time but because of the way schemas are generated it's not a small change.

I see. Thank you for the replying to this issue