Hello!

I am attempting to create work packages programmatically via the OpenProject API for a project with contains multiple custom fields. Unfortunately, I am running into a validation error with my work package payload. Following from the API documentation, I have posted to the ‘/work_packages/form’ endpoint to retrieve default values for all properties. After filling in my values, I still receive a validation error for a blank subject, even though it is filled out in my payload.

Here is my post using Python’s requests library:

    response = requests.post(
        'http://my_domain/api/v3/projects/11/work_packages/form',
        auth=('apikey', API_KEY),
        data=payload
    )

Where an example payload would be the following:

{
   "_links": {
      "assignee": {
         "href": "/api/v3/users/12", 
         "id": 12, 
         "name": "John Smith", 
         "title": "John Smith"
      }, 
      "category": {
         "href": null
      }, 
      "customField3": {
         "href": "/api/v3/string_objects?value=cf3_val", 
         "title": "cf3_val"
      }, 
      "customField4": {
         "href": "/api/v3/string_objects?value=cf4_val", 
         "title": "cf4_val"
      }, 
      "parent": {
         "href": null
      }, 
      "priority": {
         "href": "/api/v3/priorities/8"
      }, 
      "responsible": {
         "href": "/api/v3/users/12", 
         "id": 12, 
         "name": "John Smith", 
         "title": "John Smith"
      }, 
      "status": {
         "href": "/api/v3/statuses/1"
      }, 
      "type": {
         "href": "/api/v3/types/1"
      }, 
      "version": {
         "href": null
      }
   }, 
   "customField5": "123123", 
   "description": {
      "format": "textile", 
      "html": "", 
      "raw": "Created from batch script"
   }, 
   "dueDate": "2016-11-10", 
   "estimatedTime": null, 
   "lockVersion": 0, 
   "parentId": null, 
   "percentageDone": 0, 
   "remainingTime": null, 
   "startDate": "2016-11-10", 
   "subject": "123123"
}

Here is the relevant schema information:

        "schema": {
            "_links": {},
            "_type": "Schema",
<snip>
            "subject": {
                "maxLength": 255,
                "minLength": 1,
                "name": "Subject",
                "required": true,
                "type": "String",
                "writable": true
            },

And the validation errors returned:

        "validationErrors": {
            "subject": {
                "_embedded": {
                    "details": {
                        "attribute": "subject"
                    }
                },
                "_type": "Error",
                "errorIdentifier": "urn:openproject-org:api:v3:errors:PropertyConstraintViolation",
                "message": "Subject can't be blank."
            }
        }
    },

Any assistance would be greatly appreciated! I am at a loss as to what could be the problem, as the subject is included here in the same way that it is when creating a work package from the web interface.

Blaise