jx.DecodeStr passed unquoted string value and fails

[adrianduke]

I've got a situation where I'm getting the following response:

{"error_message":"operation InstantiateRelationshipSchema: decode request: decode \"vertex_a\": unexpected json type \"invalid\""}

The schema in question looks like the following:

InstantiateRelationshipSchema:
  allOf:
    - $ref: '#/RelatiesSchema'
    - type: object
      required:
        - "name"
      properties:
        name:
          type: string
          description: Name of the schema
          minLength: 1
          example: isMarriedTo
          
RelatiesSchema:
  type: object
  required:
    - vertex_a
    - vertex_b
  properties:
    vertex_a:
      oneOf:
        - type: string
          example: 8877b096617d7ab3a645243fe985
        - $ref: '#/EntitySchema'
    vertex_b:
      oneOf:
        - type: string
          example: 3df296d2ec98136b8988420c05ee
        - $ref: '#/EntitySchema'

And my usage is on the following endpoint:

    post:
      description: Instantiate a new relationship schema
      operationId: instantiateRelationshipSchema
      requestBody:
        description: Relationship schema to create
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InstantiateRelationshipSchema'
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/InstantiateRelationshipSchema'

The issue appears only when using the multipart/form-data side and submitting strings for the vertex_a and vertex_b. I've identified the offending code:

ogen/gen/_template/request_decode.tmpl

Lines 246 to 253 in 3ae5daa

	val, err := d.DecodeValue()
	if err != nil {
	return err
	}
	if err := func(d *jx.Decoder) error {
	{{- template "json/dec" $el }}
	return nil
	}(jx.DecodeStr(val)); err != nil {

jx.DecodeStr(val) - val is a raw un-quoted string value which the decoder can't parse e.g. if I submit a multipart/form-data request with abc123 as vertex_a then val at #L253 will be abc123... However the jx Decoder is expecting a JSON string token: "abc123". Hence the invalid json type error.

I've fixed my issue for now by removing the oneOf for the vertexes and only allowing the string version.