Django的：ValueError異常的承載夾具

Question

我試着加載夾具，看起來像這樣：

some_filename.json

[ 
{ 
    "fields": { 
     "blockName": "Home & Tech", 
     "catName": "Home", 
     "catUrl": "http://www.buyam.com.ng/catalog/home/35", 
     "prodDesc": "Jojo Pet food is made with added nutrition to meet the demands of a grown up dog that's highly active and needs loads of energy and nutrition. By gaining the required energy with this food, dogs can live life to the optimum. This food can prove to be better as it gives dogs the required blend of fibers that can keep the stomach healthy and the patented X-shaped kibbles that are good to maintain clean and strong teeth till the gum line.", 
     "prodName": "Jo-Jo Dog Food - Tripe Mix 400g", 
     "prodTypeName": "Pet Supplies", 
     "prodTypeUrl": "http://www.buyam.com.ng/catalog/pet-supplies/419", 
     "prodUrl": "http://www.buyam.com.ng/catalog/pet-supplies/419/jo-jo-dog-food-tripe-mix-400g" 
    }, 
    "model": "kudisavers.product", 
    "pk": 1 
}, 
{ 
... 
... 
} 
] 

，但我得到了以下錯誤：

Traceback (most recent call last): 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\serializers\json.py", line 74, in Deserializer 
    objects = json.loads(stream_or_string) 
    File "C:\Python34\lib\json\__init__.py", line 318, in loads 
    return _default_decoder.decode(s) 
    File "C:\Python34\lib\json\decoder.py", line 343, in decode 
    obj, end = self.raw_decode(s, idx=_w(s, 0).end()) 
    File "C:\Python34\lib\json\decoder.py", line 361, in raw_decode 
    raise ValueError(errmsg("Expecting value", s, err.value)) from None 
ValueError: Expecting value: line 1 column 1 (char 0) 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\__init__.py", line 385, in execute_from_command_line 
    utility.execute() 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\__init__.py", line 377, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\base.py", line 288, in run_from_argv 
    self.execute(*args, **options.__dict__) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\base.py", line 338, in execute 
    output = self.handle(*args, **options) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\commands\loaddata.py", line 61, in handle 
    self.loaddata(fixture_labels) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\commands\loaddata.py", line 91, in loaddata 
    self.load_label(fixture_label) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\management\commands\loaddata.py", line 142, in load_label 
    for obj in objects: 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\serializers\json.py", line 81, in Deserializer 
    six.reraise(DeserializationError, DeserializationError(e), sys.exc_info()[2]) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\utils\six.py", line 549, in reraise 
    raise value.with_traceback(tb) 
    File "D:\MyWork\Python\Django_Projects\VirtualEnv\lib\site-packages\django\core\serializers\json.py", line 74, in Deserializer 
    objects = json.loads(stream_or_string) 
    File "C:\Python34\lib\json\__init__.py", line 318, in loads 
    return _default_decoder.decode(s) 
    File "C:\Python34\lib\json\decoder.py", line 343, in decode 
    obj, end = self.raw_decode(s, idx=_w(s, 0).end()) 
    File "C:\Python34\lib\json\decoder.py", line 361, in raw_decode 
    raise ValueError(errmsg("Expecting value", s, err.value)) from None 
django.core.serializers.base.DeserializationError: Problem installing fixture 'D:\MyWork\Python\Django_Projects\kudisavers\fixtures\buyam-fixture.json': Expecting value: line 1 column 1 (char 0) 

這是我創建json的方式：

file = open('some_filename.json', 'wb') 
file.write(json.dumps(data, sort_keys=True, indent=4)) 
file.close() 

我從CMD加載夾具是這樣的：

python manage.py loaddata some_filename.json 

值和鍵似乎好了給我。整個JSON沒有空白值。 什麼可能是錯誤的？ 謝謝:)

Answer 1

您應該刪除JSON格式，正確的JSON文件看起來是這樣的：

[{"pk": 1, "model": "contenttypes.contenttype", "fields": {"model": "permission", "name": "permission", "app_label": "auth"}},...] 

Answer 2

您應該使用dumpdata來創建您的燈具。

從文檔：

輸出到標準輸出與指定的應用程序（一個或多個）相關聯的數據庫中的所有數據。

如果未提供應用程序名稱，則將轉儲所有安裝的應用程序。

dumpdata的輸出可以用作loaddata的輸入。

請注意，dumpdata使用模型上的默認管理器來選擇要轉儲的記錄。如果您使用自定義管理器作爲默認管理器，並且它過濾了一些可用記錄，則並非所有對象都將被轉儲。

可以提供--all選項來指定dumpdata應該使用Django的基本管理器，轉儲可能被自定義管理器過濾或修改的記錄。