Cannot read properties of undefined - getParamSchema

[mathzdev]

When I use @Body() or @param from routing-controllers I got this error Cannot read properties of undefined on getParamSchema

If I remove it or comment it, it works but don't generate openapi correctly.

I put "emitDecoratorMetadata": true on tsconfig.json but doesn't work =/

[taiwanhua]

+1

[martinmeow]

Seems to be the same as #141
I posted a possible reason / solution in #141 (comment)

[kantegory]

I have the same issue. For me it only happens at runtime (using tsx).

This problem for runtime can be solved by changing the order of function calls in getParamsSchema, for example:

function getParamSchema(
  param: ParamMetadataArgs
): oa.SchemaObject | oa.ReferenceObject {
  const { explicitType, index, object, method } = param

  if (explicitType) {
    return { $ref: '#/components/schemas/' + explicitType.name }
  }

  const type: (() => unknown) | unknown = Reflect.getMetadata(
    'design:paramtypes',
    object,
    method
  )[index]
  if (typeof type === 'function' && type.name === 'Array') {
    const items = explicitType
      ? { $ref: '#/components/schemas/' + explicitType.name }
      : { type: 'object' as const }
    return { items, type: 'array' }
  }

  // ...

So we first check explicitType and then try to resolve the type from metadata.