Patch removes required even if not set

[svenauhagen]

Hi,

in Version 3.10.3 the OpenAPI Schema removes required from the request body if the action is Patch:

if method == 'PATCH': del content['required']

but required is only set if there is actually a required field (_map_serializer):

if len(required) > 0: result['required'] = required

which leads to an obvious:

Request Method:	GET
http://127.0.0.1:8000/api/schema/
2.2.5
KeyError
'required'
/Users/sven/Programmieren/IT/repos/pegasus/pegasus/vtair/venv/lib/python3.7/site-packages/rest_framework/schemas/openapi.py in _get_request_body, line 466
/Users/sven/Programmieren/IT/repos/pegasus/pegasus/vtair/venv/bin/python3
3.7.3
['/Users/sven/Programmieren/IT/repos/pegasus/pegasus/vtair', '/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python37.zip', '/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7', '/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-dynload', '/Users/sven/Programmieren/IT/repos/pegasus/pegasus/vtair/venv/lib/python3.7/site-packages']

There should be a check for if 'required' in content

Best
Sven

[haiyangdeperci]

@svenauhagen does my pull request resolve your problem?

[svenauhagen]

@haiyangdeperci
yes that fix works, thank you