Django自定義管理器 - 如何在QuerySet之前使用自定義管理器

Question

我正在構建自己的自定義管理器來獲取模型的翻譯。的理念是：

主要型號：

class BlogTranslationManager(models.Manager):   
    def language(self): 
     lang = translation.get_language() 
     return BlogTranslation.objects.filter(lang=lang) 

class ArticleTranslationManager(models.Manager): 
    def language(self): 
     lang = translation.get_language() 
     return ArticleTranslation.objects.filter(lang=lang) 

class Blog(models.Model): 
    created = models.DateTimeField() 
    objects = models.Manager() 
    translations = BlogTranslationManager() 

    # PROBLEM HERE 
    @property 
    def articles(self): 
     # here I need translations of all articles of this blog 
     # I cannot do: 
     return self.blog_articles.translations.language('en') 
     # because 'translations' Manager cannot be called on QuerySet 
     # what can I do here? am I missing something in CustomManagers? 


class Article(models.Model): 
    blog = models.ForeignKey(Blog, related_name="blog_articles") 
    objects = models.Manager() 
    translations = ArticleTranslationManager() 

class BlogTranslation(models.Model): 
    book = models.ForeignKey(Book, related_name="book_translations") 
    field_name = models.CharField(max_length=10) 
    lang = models.CharField(max_length=3) 
    translation = models.TextField() 

class ArticleTranslation(models.Model): 
    article = models.ForeignKey(Article, related_name="article_translations") 
    field_name = models.CharField(max_length=10) 
    lang = models.CharField(max_length=3) 
    translation = models.TextField() 

和模板，我希望能夠調用：

{{ blog.articles }} 

我所描述的問題吧上面的代碼中，任何想法吧？任何幫助，高度讚賞！

Answer 1

先嚐試使用Article.translations管理器，然後過濾生成的查詢集。如果我沒有理解你的模型，你想要的東西，如：

@property 
def articles(self): 
    return Article.translations.language('en').filter(article__blog=self)