MongoEngine ListField引發TypeError上驗證

Question

我不知道這是否是內MongoEngine或者如果我錯過了什麼的錯誤。 我有以下型號設置：

class Features(EmbeddedDocument): 
    version = FloatField() 
    data = ListField(StringField) 

class Article(Document): 
    vendor = ReferenceField(Vendor) 
    url = URLField() 
    author = StringField() 
    clean_content = StringField() 
    features = EmbeddedDocumentField(Features) 

當我測試的模型是這樣的：

#add vendor 
vendor = Vendor(name="techcrunch", config="vendor config") 
vendor.save() 

#create features 
features = Features(version = 1.0) 
features.data = ["5", "89"] 

#add article 
article = Article(vendor = vendor, url ="http://www.techcrunch.com", 
        author ="MG Siegler", clean_content = "Apple rocks!") 
article.features = features 
article.save() 

我得到以下錯誤：

TypeError: unbound method _validate() must be called with StringField instance as first argument (got str instance instead) 

有人能解釋一下嗎？

編輯：

沒關係。我發現我的錯誤。

它必須是：

class Features(EmbeddedDocument): 
    version = FloatField() 
    data = ListField(StringField()) 

Answer 1

我發現的錯誤。

它必須是：

class Features(EmbeddedDocument): 
    version = FloatField() 
    data = ListField(StringField())