Json Post from Django to Camunda - json

Question

Further to my earlier post yesterday: Post request to external Rest Service using Django - use returned json to update model
I have managed to post data to camunda using Django - request.post. Using the following script:
payload = "{\n \"businessKey\": \"SomeValue\",\n \"variables\": {\n \"Organisation_ID\": {\n \"value\": \"SOmeUUID\",\n \"type\": \"String\"\n },\n \"UserID\": {\n \"value\":\"Some User ID\",\n \"type\": \"String\"\n }\n }\n}"
However when I start to use variables from the form and format my payload using
class StartProcessView(View):
template_name = 'startdeliveryphase.html'
def get(self,request, *args, **kwargs):
form = IntStartDeliveryPhase
return render(request, self.template_name,{'form':form})
def post(self,request, *args, **kwargs):
form = IntStartDeliveryPhase(request.POST or None)
if form.is_valid():
data = form.cleaned_data
OrganisationID = data['Form_Field_OrganisationID']
UserID = data['Form_Field_User_ID']
BusinessKey = data['Form_Field_Business_Key']
url = "http://localhost:8080/engine-rest/process-definition/key/Process_B_PerProject/start"
payload = {"businessKey":BusinessKey,"variables":[{"Organisation":[{"value":OrganisationID, "type":"String"}]},[{"Startedby":[{"value":UserID,"type":"String"}]}]]}
headers = {
'Content-Type': 'application/json'
}
response = requests.request("POST", url, headers=headers, data = payload)
#print(repsonse.errors)
print(response.text.encode('utf8'))
return render(request)
else:
return render(request,self.template_name,{'form':form})
I get an error from the camunda engine:-
b'{"type":"JsonParseException","message":"Unrecognized token \'businessKey\': was expecting (\'true\', \'false\' or \'null\')\\n at [Source: (org.camunda.bpm.engine.rest.filter.EmptyBodyFilter$1$1); line: 1, column: 13]"}'
the local vars shows the following:
▼ Local vars
Variable Value
BusinessKey
'1qaz'
OrganisationID
<Organisation: Some Local Authoristy>
UserID
<Actor_User: me#me.com>
args
()
data
{'Form_Field_Business_Key': '1qaz',
'Form_Field_CamundaInstanceID': 'sss',
'Form_Field_Camunda_HRef': 'ss',
'Form_Field_Camunda_TenantID': '22',
'Form_Field_DateCreated': datetime.datetime(2020, 4, 23, 19, 22, 30, tzinfo=<StaticTzInfo 'GMT'>),
'Form_Field_OrganisationID': <Organisation: Some Local Authoristy>,
'Form_Field_User_ID': <Actor_User: me#me.com>}
form
<IntStartDeliveryPhase bound=True, valid=True, fields=(Form_Field_OrganisationID;Form_Field_DateCreated;Form_Field_CamundaInstanceID;Form_Field_Camunda_HRef;Form_Field_Camunda_TenantID;Form_Field_User_ID;Form_Field_Business_Key)>
headers
{'Content-Type': 'application/json'}
kwargs
{}
payload
{'businessKey': '1qaz',
'variables': [{'Organisation': [{'type': 'String',
'value': <Organisation: Some Local Authoristy>}]},
[{'Startedby': [{'type': 'String',
'value': <Actor_User: me#me.com>}]}]]}
request
<WSGIRequest: POST '/bimProcess/'>
response
<Response [400]>
self
<bimProcess.views.StartProcessView object at 0x055B7898>
url
'http://localhost:8080/engine-rest/process-definition/key/Process_B_PerProject/start'
How do I get the correct format as required by camunda into which I can insert my variables with the required double quotes
EDIT Yay - I have finally got the correct sequence!!!!
def post(self,request, *args, **kwargs):
form = IntStartDeliveryPhase(request.POST or None)
if form.is_valid():
data = form.cleaned_data
OrganisationID = str(data['Form_Field_OrganisationID'])
UserID = str(data['Form_Field_User_ID'])
BusinessKey = data['Form_Field_Business_Key']
url = "http://localhost:8080/engine-rest/process-definition/key/Process_B_PerProject/start"
payload = {"businessKey":BusinessKey,"variables":{"Organisation":{"value":OrganisationID, "type":"String"},"Startedby":{"value":UserID,"type":"String"}}}
headers = {
'Content-Type': 'application/json'
}
payload2 = json.dumps(payload)
print (payload2)
response = requests.request("POST", url, headers=headers, data=payload2)
#print(repsonse.errors)
print(response.text.encode('utf8'))
return render(request)
else:
return render(request,self.template_name,{'form':form})
Now for the next questions:
1) I get a response from Camunda as a 200: the payload back from the post request needs to go back into the form data where it can then be saved without user interruption.
2)I am doing a post self on this form - what is the best way of achieving the sequence flow? should I do a redirect and pass the data through or is there a more efficient way? Also is there a better way to achieve the view.py than I have posted which is more efficient?

Answer 1

def post(self,request, *args, **kwargs):
form = IntStartDeliveryPhase(request.POST or None)
if form.is_valid():
data = form.cleaned_data
OrganisationID = str(data['Form_Field_OrganisationID'])
UserID = str(data['Form_Field_User_ID'])
BusinessKey = data['Form_Field_Business_Key']
url = "http://localhost:8080/engine-rest/process-definition/key/Process_B_PerProject/start"
payload = {"businessKey":BusinessKey,"variables":{"Organisation":{"value":OrganisationID, "type":"String"},"Startedby":{"value":UserID,"type":"String"}}}
headers = {
'Content-Type': 'application/json'
}
payload2 = json.dumps(payload)
print (payload2)
response = requests.request("POST", url, headers=headers, data=payload2)
#print(repsonse.errors)
print(response.text.encode('utf8'))
return render(request)
else:
return render(request,self.template_name,{'form':form})