Schema object cannot have additionalProperty LB4 App

[marioestradarosa]

Steps to reproduce

• Create a loopback 4 app
• Create a datasource to Mysql
• Create the student model, repository an controller

Make sure it works thru browser. Then follow the oasgraph quick start guide as follows:

• Clone oasgraph
• cd to oasgraph
• run npm link
• copy the openapi.json file from loopback 4 app running to my current oasgrahp directory (see attached, I placed .txt at the end to allow github attachment)
  using wget http://localhost:3000/openapi.json
• run oasgraph openapi.json

The following error was received:

{ AssertionError: Schema object cannot have additionalProperty: patternProperties
    at Assertion.fail (/Users/marioestradarosa/test/oasgraph/node_modules/should/as-function.js:275:17)
    at Assertion.value (/Users/marioestradarosa/test/oasgraph/node_modules/should/as-function.js:356:19)
    at checkSubSchema (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/index.js:131:16)
    at walkSchema (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/node_modules/oas-schema-walker/index.js:53:5)
    at Object.walkSchema (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/node_modules/oas-schema-walker/index.js:82:13)
    at checkSchema (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/index.js:332:8)
    at checkContent (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/index.js:380:13)
    at checkResponse (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/index.js:569:9)
    at checkPathItem (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/index.js:782:21)
    at Object.validateSync (/Users/marioestradarosa/test/oasgraph/node_modules/oas-validator/index.js:1160:13)
  operator: 'to be above -1',
  message: 'Schema object cannot have additionalProperty: patternProperties',
  actual: -1,
  stackStartFunction: [Function: assert],
  negate: false,
  assertion: 
   Assertion {
     obj: -1,
     anyOne: false,
     negate: false,
     params: 
      { operator: 'to be above -1',
        message: 'Schema object cannot have additionalProperty: patternProperties',
        actual: -1,
        stackStartFunction: [Function: assert],
        negate: false,
        assertion: [Circular] },
     onlyThis: undefined,
     light: false } }

Attached openapi.json file.
openapi.json.txt

[raymondfeng]

It’s related to loopbackio/loopback-next#1755. I did not realize that OAS does not allow patternProperties. We need to use a different way to describe headers.

[marioestradarosa]

Thanks @raymondfeng , I just started playing around with this library.

[marioestradarosa]

We need to use a different way to describe headers.

Are these headers only for ping controller?, I just removed the ping controller spec from openapi.json file and it seems to be running now, albeit still with some complains like (Delete operation having InvalidSchemaType).

[raymondfeng]

Just for ping controller

[raymondfeng]

Based on https://swagger.io/docs/specification/data-models/data-types/#object, we can probably use free form object.

[raymondfeng]

Mario, feel free to submit a patch. Thanks!