Django Rest Framework中序列化程序之间的Mixin公共字段

问题描述

我有这个:

class GenericCharacterFieldMixin():
    attributes = serializers.SerializerMethodField('character_attribute')
    skills = serializers.SerializerMethodField('character_skill')

    def character_attribute(self, obj):
        character_attribute_fields = {}
        character_attribute_fields['mental'] = {str(trait_item.get()): trait_item.get().current_value
                                                for trait_item in obj.mental_attributes}
        character_attribute_fields['physical'] = {str(trait_item.get()): trait_item.get().current_value
                                                  for trait_item in obj.physical_attributes}
        character_attribute_fields['social'] = {str(trait_item.get()): trait_item.get().current_value
                                                for trait_item in obj.social_attributes}
        return character_attribute_fields

    def character_skill(self, obj):
        character_skill_fields = {}
        character_skill_fields['mental'] = {str(trait_item.get()): trait_item.get().current_value
                                            for trait_item in obj.mental_skills}
        character_skill_fields['physical'] = {str(trait_item.get()): trait_item.get().current_value
                                              for trait_item in obj.physical_skills}
        character_skill_fields['social'] = {str(trait_item.get()): trait_item.get().current_value
                                            for trait_item in obj.social_skills}
        return character_skill_fields


class MageSerializer(GenericCharacterFieldMixin, serializers.ModelSerializer):
    player = serializers.ReadOnlyField(source='player.username')
    arcana = serializers.SerializerMethodField()

    def get_arcana(self, obj):
        if obj:
            return {str(arcana): arcana.current_value for arcana in obj.linked_arcana.all()}

    class Meta:
        model = Mage
        fields = ('id', 'player', 'name', 'sub_race', 'faction', 'is_published',
                  'power_level', 'energy_trait', 'virtue', 'vice', 'morality', 'size',
                  'arcana', 'attributes', 'skills')
        depth = 1

GenericCharacterFieldMixin是通用字符(即所有类型的字符都通用)的字符字段的混合.

GenericCharacterFieldMixin is a Mixin of Fields for Characters, that are Generic, i.e. common to all types of characters.

我希望我的Mage序列化器将这些混合"而不是c/p，然后在所有类型的字符(Mage是一种字符)之间进行混合，希望这会增加我的Web应用程序中的DRYness.

I'd like my Mage Serializer to have these 'mixed in' rather than c/p then between all types of character (Mage is a type of character) hopefully this will increase DRYness in my webapp.

问题出在我有这个模型上:

The issue is on the model I have this:

class NWODCharacter(models.Model):

    class Meta:
        abstract = True
        ordering = ['updated_date', 'created_date']

    name = models.CharField(max_length=200)
    player = models.ForeignKey('auth.User', related_name="%(class)s_by_user")
    ....

    def save(self, *args, **kwargs):
        ...

    attributes = GenericRelation('CharacterAttributeLink')
    skills = GenericRelation('CharacterSkillLink')

这意味着我收到此错误:

Which means I get this error:

TypeError at /characters/api/mages
<django.contrib.contenttypes.fields.create_generic_related_manager.<locals>.GenericRelatedObjectManager object at 0x00000000051CBD30> is not JSON serializable

Django Rest Framework认为我想序列化我的通用关系.

如果我重命名模型中的字段(s/attributes/foos/g，s/skills/bars/g)，则会收到其他错误(不太清楚吗?):

If I rename the fields in the model (s/attributes/foos/g, s/skills/bars/g) then I get a different (less clear?) error :

ImproperlyConfigured at /characters/api/mages
Field name `attributes` is not valid for model `ModelBase`.

如何在不混淆DRF的情况下将这些方法和字段拉入mixin?

How do I pull those methods and fields into a mixin, without confusing DRF?

推荐答案

解决方案很简单，只需更改

Solution is simple as changing

class GenericCharacterFieldMixin():

到

class GenericCharacterFieldMixin(serializers.Serializer):

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