使用 fastjsonschema 编译 json 模式给出 TypeError: string indices must be integers答案

【问题标题】：Compiling json schema using fastjsonschema gives TypeError: string indices must be integers使用 fastjsonschema 编译 json 模式给出 TypeError: string indices must be integers
【发布时间】：2020-01-20 13:40:48
【问题描述】：

我正在使用 fastjsonschema 来根据其架构验证 json 记录。 compile 方法适用于简单模式，但是在使用引用 fastjsonschema 编译 json 模式时会出错。 TypeError：字符串索引必须是整数。下面是代码 sn-p、json 架构和错误。

编译架构的代码#####

import fastjsonschema

schema_file = open(schema.json)
schema_str = schema_file.read()
validatation = fastjsonschema.compile(schema_str)

schema.json 的内容

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "organization",
    "description": "JSON schema",
    "type": "object",
    "properties": {
        "transactionDetail": {
            "id": "https://example.com/transactionDetail",
            "type": "object",
            "properties": {
                "transactionID": {
                    "description": "A number assigned by the calling application to uniquely identify this request.",
                    "type": "string"
                },
                "transactionTimestamp": {
                    "description": "The date and time when this request was submitted.",
                    "type": "string"
                }
            },
            "required": [
                "transactionID"
            ],
            "additionalProperties": false
        },
        "organization": {
            "$ref": "#/definitions/organization"
        }
    },
    "additionalProperties": false,
    "definitions": {
        "organization": {
            "type": "object",
            "properties": {
                "identifier": {
                    "description": "identification number.",
                    "type": "string",
                    "minLength": 1,
                    "maxLength": 12
                },
                "countryCode": {
                    "description": "The two-letter country code.",
                    "type": "string",
                    "minLength": 2,
                    "maxLength": 2
                },
                "timestamp": {
                    "description": "The date and time that the record was created.",
                    "type": "string"
                },

                "required": [
                    "identifier",
                    "countryCode"
                ],
                "additionalProperties": false
            }
        }
    }
}

Expected Result: Nothing

Actual Result:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/dnbusr1/z-gda-pad/anaconda3/lib/python3.6/site-packages/fastjsonschema/__init__.py", line 153, in compile
  resolver, code_generator = _factory(definition, handlers)
  File "/dnbusr1/z-gda-pad/anaconda3/lib/python3.6/site-packages/fastjsonschema/__init__.py", line 193, in _factory
  resolver = RefResolver.from_schema(definition, handlers=handlers)
  File "/dnbusr1/z-gda-pad/anaconda3/lib/python3.6/site-packages/fastjsonschema/ref_resolver.py", line 89, in from_schema
  **kwargs
  File "/dnbusr1/z-gda-pad/anaconda3/lib/python3.6/site-packages/fastjsonschema/ref_resolver.py", line 78, in __init__
  self.walk(schema)
  File "/dnbusr1/z-gda-pad/anaconda3/lib/python3.6/site-packages/fastjsonschema/ref_resolver.py", line 148, in walk
  elif '$ref' in node and isinstance(node['$ref'], str):
      TypeError: string indices must be integers

【问题讨论】：

标签： python json python-3.x schema fastjson

【解决方案1】：

我也遇到过这个问题，看来您需要使用 dict（而不是 str）来提供 fastjsonschema 编译和验证方法。

一种简单的方法是在 Python 中使用 json 模块：

with open(myschema, 'r') as file:
  schemadict = json.loads(file.read())
  validate = fastjsonschema.compile(schemadict)

【讨论】：