使现有字段可翻译(Django)

Question

我正在尝试翻译模型类上已经存在的字段。我在第一步卡住了，这是子类化Category中的TranslatableModel类，并添加TranslatedFields包装器来翻译选定的模型字段。我正在遵循一本名为"Django by Example"的书以及Django -parler关于如何做到这一点的说明，但是我得到了以下错误:

File ..../env/lib/python3.5/site-packages/parler/models.py", line 965, in contribute_translations
raise TypeError("The model '{0}' already has a field named '{1}'".format(shared_model.__name__, name))
TypeError: The model 'Category' already has a field named 'name'

在应用django-parler之前:

# models.py
class Category(models.Model):
    name = models.CharField(max_length=200,
                            db_index=True)
    slug = models.SlugField(max_length=200,
                            unique=True)
    class Meta:
        ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'
    def __str__(self):
        return self.name
    def get_absolute_url(self):
        return reverse('shop:product_list_by_category',
                       args=[self.slug])

应用django-parler后:

# models.py
class Category(TranslatableModel):
    name = models.CharField(max_length=200,
                            db_index=True)
    slug = models.SlugField(max_length=200,
                            unique=True)
    translations = TranslatedFields(
        name = models.CharField(max_length=200,
                                db_index=True),
        slug = models.SlugField(max_length=200,
                                unique=True),
    )
    class Meta:
        # ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'
    def __str__(self):
        return self.name
    def get_absolute_url(self):
        return reverse('shop:product_list_by_category',
                       args=[self.slug])

Answer 1

好的，从你的代码判断，你正试图遵循"Django by Example" by Antonio Mele....我也有同样的问题。对我来说，修复是在原始模型中使用下划线前缀所有字段，所以……

name = models.CharField(max_length=200,db_index=True)…就变成了_name = models.CharField(max_length=200,db_index=True)

还有一点研究表明，从Django 1.9开始，有一个import重命名为..reveresinglerelatedobjectdescriptor as perhttps://github.com/django-json-api/django-rest-framework-json-api/issues/176

我改变了导入和另一个条件语句引用(第782行)从'ReverseSingleRelatedObjectDescriptor'到'ForwardManyToOneDescriptor'在以下文件"/Django/local/lib/python2.7/site-packages/parler/models.py"..但我不确定最后一步是否真的有必要，我认为重命名就足够了??祝你好运.....

Answer 2

尽管这个问题很老，我还是想贡献一下。添加django-parler后，你的代码片段应该像这样:

<标题>

  class Category(TranslatableModel):
      translations = TranslatedFields( 
            name = models.CharField(max_length=200,
                            db_index=True),
            slug = models.SlugField(max_length=200,
                            unique=True),)
    class Meta:
        # ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'
    def __str__(self):
        return self.name
    def get_absolute_url(self):
        return reverse('shop:product_list_by_category',
                   args=[self.slug])