Adding not validated dictionary with python eve along with an image - eve

Question

I want to import images in mongoDB along with any dictionary. The dictionary should provide image tags, of which types, numbers and names I can't know at the moment I define the schema.
I'm trying to add a dictionary in eve without success:
curl -F"attr={\"a\":1}" -F "img_id=2asdasdasd" -F "img_data=#c:\path\
1.png;type=image/png" http://127.0.0.1:5000/images
{"_status": "ERR", "_issues": {"attr": "must be of dict type"}, "_error": {"message": "Insertion failure: 1 document(s)
contain(s) error(s)", "code": 422}}
My schema definition looks like that:
'schema': {
#Fixed attributes
'original_name': {
'type': 'string',
'minlength': 4,
'maxlength': 1000,
},
'img_id': {
'type': 'string',
'minlength': 4,
'maxlength': 150,
'required': True,
'unique': True,
},
'img_data': {
'type': 'media'
},
#Additional attributes
'attr': {
'type': 'dict'
}
}
Is it possible at all? Should the schema for dicts be fixed?
EDIT
I wanted to add image first and the dictionary after it, but get an error in PATCH request:
C:\Windows\SysWOW64>curl -X PATCH -i -H "Content-Type: application/json" -d "{\
"img_id\":\"asdasdasd\", \"attr\": {\"a\": 1}}" http://localhost:5000/images/asd
asdasd
HTTP/1.0 405 METHOD NOT ALLOWED
Content-Type: application/json
Content-Length: 106
Server: Eve/0.7.4 Werkzeug/0.9.4 Python/2.7.3
Date: Wed, 28 Jun 2017 22:55:54 GMT
{"_status": "ERR", "_error": {"message": "The method is not allowed for the requested URL.", "code": 405}}

Answer 1

I have posted an issue on Github for the same situation. However I have came with a workaround.
Override the dict validator:
class JsonValidator(Validator):
def _validate_type_dict(self, field, value):
if type(value) is dict:
pass
try:
json.loads(value)
except:
self._error(value, "Invalid JSON")
app = Eve(validator=JsonValidator)
Next, add an insert hook:
def multi_request_json_parser(documents):
for item in documents:
if 'my_json_field' in item.keys():
item['my_json_field'] = json.loads(item['my_json_field'])
app.on_insert_myendpoint += multi_request_json_parser
The dict validator must be overidden, because else the insert hook will not be called due to an validation error.