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python - TypeError：字符串索引必须是 Django 中的整数

问题描述

我正在尝试将 json 存储到 bigchainDB 中。但问题是当我对 json 对象进行硬编码并在其他节点之间广播时，它会成功。但是当我从邮递员发送相同的 json 对象时，我收到了一个错误string indices must be integers

这是我的功能

 def index(request):
    root = settings.BIGCHAINDB
    bdb = BigchainDB(root)
    alice, bob = generate_keypair(), generate_keypair()
    insertDB =  json.dumps(request.body.decode("utf-8"))
    jsonDict =  json.loads(insertDB)
    prepared_token_tx = bdb.transactions.prepare(
        operation='CREATE',
        signers=alice.public_key,
        recipients=[([bob.public_key], 10)],
        asset=jsonDict)
    fulfilled_token_tx = bdb.transactions.fulfill(
        prepared_token_tx,
        private_keys=alice.private_key)
    bdb.transactions.send_commit(fulfilled_token_tx)
    txid = fulfilled_token_tx['id']
    return HttpResponse(txid)

JSON对象：

{“数据”：{“cphNumber”：“321”，“farmName”：“313”，“addressLine1”：“13”，“addressLine2”：“13”，“region”：“13”，“postalCode”： “13”、“corrName”：“13”、“corrAddressLine1”：“131”、“corrAddressLine2”：“31”、“corrRegion”：“31”、“corrCountry”：“321”、“corrPostal”：“31” ”、“corrMobile”：“321”、“corrEmail”：“31”、“agentName”：“31”、“agentAddressLine1”：“313”、“agentAddressLine2”：“132”、“agentRegion”：“13”、 "agentCountry”：“132”，“agentPostal”：“132”，“brn”：“13”，“animalSpecies”：“132”} }

Django Version: 2.1.7
Python Version: 3.7.1
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'api']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback:

File "/home/user/miniconda3/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/home/user/miniconda3/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
  126.                 response = self.process_exception_by_middleware(e, request)

File "/home/user/miniconda3/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/user/miniconda3/lib/python3.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
  54.         return view_func(*args, **kwargs)

File "/home/user/Desktop/blockchain/api/views.py" in index
  48. 		asset=jsonDict)

File "/home/user/miniconda3/lib/python3.7/site-packages/bigchaindb_driver/driver.py" in prepare
  254.             inputs=inputs,

File "/home/user/miniconda3/lib/python3.7/site-packages/bigchaindb_driver/offchain.py" in prepare_transaction
  132.         inputs=inputs,

File "/home/user/miniconda3/lib/python3.7/functools.py" in wrapper
  824.         return dispatch(args[0].__class__)(*args, **kw)

File "/home/user/miniconda3/lib/python3.7/site-packages/bigchaindb_driver/offchain.py" in _prepare_create_transaction_dispatcher
  45.     return prepare_create_transaction(**kwargs)

File "/home/user/miniconda3/lib/python3.7/site-packages/bigchaindb_driver/offchain.py" in prepare_create_transaction
  196.         asset=asset['data'] if asset else None,

Exception Type: TypeError at /api/
Exception Value: string indices must be integers

任何建议都是最受欢迎的。提前致谢。

标签： pythonjsondjangopython-3.x

解决方案

这里的问题是您正在使用json.dumps()on request.body，它已经是一个字符串。因此，当您使用json.loads()它时，您的数据不会被解析为dict.

 def index(request):
    root = settings.BIGCHAINDB
    bdb = BigchainDB(root)
    alice, bob = generate_keypair(), generate_keypair()
    insertDB =  request.body.decode("utf-8")  # Don't use json.dumps() here
    jsonDict =  json.loads(insertDB)
    prepared_token_tx = bdb.transactions.prepare(
        operation='CREATE',
        signers=alice.public_key,
        recipients=[([bob.public_key], 10)],
        asset=jsonDict)
    fulfilled_token_tx = bdb.transactions.fulfill(
        prepared_token_tx,
        private_keys=alice.private_key)
    bdb.transactions.send_commit(fulfilled_token_tx)
    txid = fulfilled_token_tx['id']
    return HttpResponse(txid)

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