weaviate错误代码400解析正文来自...查找对象开头的无效字符'G‘失败

Question

我正在尝试遵循https://www.semi.technology/documentation/weaviate/current/client-libs/python.html中的步骤，但最终遇到了与以下内容相同的问题：

parsing body body from \"\" failed, because invalid character 'G' looking for beginning of object key string

由于另一个问题没有得到回答，我尝试在weaviate上下文中更详细地询问。

我尝试了下面的python单元测试：

'''
Created on 24.07.2020

@author: wf
'''
import unittest
import weaviate

class TestWeaviate(unittest.TestCase):
# https://www.semi.technology/documentation/weaviate/current/client-libs/python.html


    def setUp(self):
        pass


    def tearDown(self):
        pass
        

    def testWeaviate(self):
        ''' see https://www.semi.technology/documentation/weaviate/current/client-libs/python.html '''

        client = weaviate.Client("http://localhost:8080")
        try:
            client.create_schema("https://raw.githubusercontent.com/semi-technologies/weaviate-python-client/master/documentation/getting_started/people_schema.json")
        except:
            pass
        entries=[
           [ {"name": "John von Neumann"}, "Person", "b36268d4-a6b5-5274-985f-45f13ce0c642"],
           [ {"name": "Alan Turing"}, "Person", "1c9cd584-88fe-5010-83d0-017cb3fcb446"],
           [ {"name": "Legends"}, "Group", "2db436b5-0557-5016-9c5f-531412adf9c6" ]
        ]
        for entry in entries:
            dict,type,uid=entry
            try:
                client.create(dict,type,uid)
            except weaviate.exceptions.ThingAlreadyExistsException as taee:
                print ("%s already created" % dict['name'])
            
        pass


if __name__ == "__main__":
    #import sys;sys.argv = ['', 'Test.testName']
    unittest.main()

结果是：

John von Neumann already created
Alan Turing already created
Legends already created
----------------------------------------------------------------------
Ran 1 test in 0.370s

OK

(重新运行后)

然后我试着：

curl http://localhost:8080/v1/graphql -X POST -H 'Content-type: application/json' -d '
{
  Get {
    Things {
      Group {
        name
        uuid
        Members {
          ... on Person {
            name
            uuid
          }
        }
      }
    }
  }
}'

获取错误：{"code":400，"message":"parsing body body from“失败，因为无效字符'G‘正在寻找对象键字符串的开头”}

Answer 1

请求需要一个JSON对象(因为Content-type: application/json)，这可以通过设置-d '{ "query": "{ # GRAPHQL QUERY }" }' (docs)来添加。

因此，在您的示例中，要发送的JSON对象为：

{
  "query": 
  "{ 
     Get { 
       Things { 
         Group { 
           name uuid Members { ... on Person { name uuid } }  
         } 
       } 
     } 
  }"
}

或者完整的请求：

$ curl http://localhost:8080/v1/graphql -X POST -H 'Content-type: application/json' -d '{
        "query": "{ Get { Things { Group { name uuid Members { ... on Person { name uuid } } } } } }"
    }'

结果是：

{"data":{"Get":{"Things":{"Group":[{"Members":null,"name":"Legends","uuid":"2db436b5-0557-5016-9c5f-531412adf9c6"}]}}},"errors":null}