Django的：在一個抽象模型

限定通用管理用下面的代碼和限定每個每類合適NATURAL_KEY失敗（而不是定義在每個類不同的經理，其複製相同的代碼）：Django的：在一個抽象模型

class NexchangeManager(models.Manager): 
    def get_by_natural_key(self, param): 
     if param == "*": 
      return self.all() 
     lookup = {self.NATURAL_KEY: param} 
     return self.get(**lookup) 


class NexchangeModel(models.Model): 
    class Meta: 
     abstract = True 
    objects = NexchangeManager()

Djagno雖然NexhcnageModel是一個抽象模型，但抱怨字段複製。我應該用mixin代替嗎？

錯誤：

django.core.serializers.base.DeserializationError: Problem installing fixture '/Users/beoleg/dev/nexchange/core/fixtures/pairs_cross.json': 'NexchangeManager' object has no attribute 'NATURAL_KEY': (core.pair:pk=1) field_value was '['LTC']'

這樣做的目的，乍一看有點過於複雜的代碼，有這樣的事情在我的燈具：

[ 
    { 
    "model": "payments.paymentpreference", 
    "pk": 8, 
    "fields": { 
     "user": ["onit"], 
     "identifier": "[email protected]", 
     "payment_method": 12, 
     "comment": "Please send the funds as a personal payment (this is a precaution to prevent charge backs, payments for goods and services will be automatically declined)", 
     "currency": [ 
      ["*"] 
     ], 
     "created_on":"2016-11-01T17:41:28+00:00", 
     "modified_on":"2016-11-01T17:41:28+00:00" 
    } 
    } 
]

Instaed的：

[ 
    { 
    "model": "payments.paymentpreference", 
    "pk": 8, 
    "fields": { 
     "user": ["onit"], 
     "identifier": "[email protected]", 
     "payment_method": 12, 
     "comment": "Please send the funds as a personal payment (this is a precaution to prevent charge backs, payments for goods and services will be automatically declined)", 
     "currency": [ 
     ["USD"], 
     ["RUB"], 
     ["EUR"], 
     ["GBP"], 
     ["JPY"], 
     ["HRK"], 
     ["CHF"], 
     ["PLN"], 
     ["RON"], 
     ["BGN"], 
     ["CZK"], 
     ["AUD"], 
     ["CAD"], 
     ["NOK"], 
     ["SEK"], 
     ["DKK"], 
     ["HUF"], 
     ["TRY"], 
     ["ZAR"], 
     ["NZD"], 
     ["BRL"], 
     ["IDR"], 
     ["ILS"], 
     ["INR"], 
     ["KRW"], 
     ["MXN"], 
     ["MYR"], 
     ["PHP"], 
     ["THB"] 
     ], 
     "created_on":"2016-11-01T17:41:28+00:00", 
     "modified_on":"2016-11-01T17:41:28+00:00" 
    } 
    } 
]

來源

2017-03-01 Oleg Belousov

失敗怎麼辦？顯示實際的錯誤。並舉例說明您如何以及在哪裏定義NATURAL_KEY。 –

@DanielRoseman編輯！謝謝！ –

我不明白你寫你的經理的方式。如果NATURAL_KEY是每個模型的屬性，我會寫：

class NexchangeManager(models.Manager): 
    def get_by_natural_key(self, param): 
     qs = self.get_queryset() 
     if param == "*": 
      return qs.all() 
     lookup = {qs.model.NATURAL_KEY: param} 
     return qs.filter(**lookup)

來源

2017-03-01 09:47:01 albar

django.core.serializers.base.DeserializationError：安裝fixture的問題'/Users/beoleg/dev/nexchange/core/fixtures/pairs_cross.json'：'QuerySet'對象沒有屬性'id'：（core.pair：pk = 1）field_value是'['BTC']' –

注：這個答案是基於albars答案，但改善了允許PK PARAMS。

經理：

class NexchangeManager(models.Manager): 
    def get_by_natural_key(self, param): 
     qs = self.get_queryset() 
     if param == "*": 
      return self.all() 
     lookup = {qs.model.NATURAL_KEY: param} 
     return self.get(**lookup)

通用Model類：

class NexchangeModel(models.Model): 
    class Meta: 
     abstract = True 
    objects = NexchangeManager()

來源

2017-03-01 12:46:40

Django的：在一個抽象模型

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