drf图片字段序列化完整路径

一.需求

　　前端需要它想要的数据格式：

　　　　

　　原有的数据格式：

二.定制化：

　　1.可以嵌套序列化pol_type,lit_des，area_detail，但结构如下：

class ChrDetailSerializer(serializers.ModelSerializer):
    """
    年代地层详情序列化
    """

    class Meta:
        model = Address_Lis
        fields = ('region',)

class LisDetailSerializer(serializers.ModelSerializer):
    """
    岩石地层序列化
    """
    parent_categry = ChrDetailSerializer()

    class Meta:
        model = Address_Lis
        fields = ('region', 'parent_categry')

class PolarizedTypeSeriliazer(serializers.ModelSerializer):
    """
    偏光类型序列化
    """

    class Meta:
        model = PolarizedType
        fields = ('pol_type',)

class LithologicalSeriliazer(serializers.ModelSerializer):
    """
    岩性序列化
    """

    class Meta:
        model = Lithological
        fields = ('lit_des',)

class RockDetailSerializer(serializers.ModelSerializer):
    """
    详情序列化
    """
    pol_type = PolarizedTypeSeriliazer()
    lit_des = LithologicalSeriliazer()
    area_detail = LisDetailSerializer()

    class Meta:
        model = Rock
        fields = '__all__'

　　　　于是前端就不高兴了，不行这样的格式，前端说写起来有点麻烦，于是乎改呗。

　　2. 想了下，利用serializer.SerializerMethodField()好像还挺容易解决的：

　　　　好像是解决了，一看我去，完了，这个图片的字段不是完整的url啊，一想，我不可能把域名放在setting中，然后拼接吧，就太low了。

class RockDetailSerializer(serializers.ModelSerializer):
    """
    详情序列化
    """

    detail = serializers.SerializerMethodField(read_only=True)
    area_detail = serializers.SerializerMethodField(read_only=True)
    pol_type = serializers.SerializerMethodField(read_only=True)
    lit_des = serializers.SerializerMethodField(read_only=True)
    well_name = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = Rock
        fields = ('detail', 'area_detail', 'pol_type', 'lit_des', 'depth', 'well_name')

    def get_detail(self, obj):
        try:
            return {'id': obj.id, 'image': obj.image.url, 'lit_com': obj.lit_com, 'multiple': obj.multiple,
                    'color': obj.color, 'pal_fea': obj.pal_fea, 'lit_fea': obj.lit_fea, 'por_fea': obj.por_fea}
        except:
            return None

    def get_area_detail(self, obj):
        try:
            add_obj = obj.area_detail
            return str(add_obj.parent_categry.region) + '-' + str(add_obj.region)
        except:
            return None

    def get_pol_type(self, obj):
        try:
            return obj.pol_type.pol_type
        except:
            return None

    def get_lit_des(self, obj):
        try:
            return obj.lit_des.lit_des
        except:
            return None

    def get_well_name(self, obj):
        try:
            return obj.area_detail.parent_categry.parent_categry.region
        except:
            return None

　　3.心想，可以在写一个序列化啊，于是又开干了：

　　　　

class RockBasicSerializer(serializers.ModelSerializer):
    class Meta:
        model = Rock
        fields = ('id', 'image', 'lit_com', 'multiple', 'color', 'pal_fea', 'lit_fea', 'por_fea')

class RockDetailSerializer(serializers.ModelSerializer):
    """
    详情序列化
    """

    detail = serializers.SerializerMethodField(read_only=True)
    area_detail = serializers.SerializerMethodField(read_only=True)
    pol_type = serializers.SerializerMethodField(read_only=True)
    lit_des = serializers.SerializerMethodField(read_only=True)
    well_name = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = Rock
        fields = ('detail', 'area_detail', 'pol_type', 'lit_des', 'depth', 'well_name')

    def get_detail(self, obj):
        try:
             rock_obj = RockBasicSerializer(obj, many=False, context={'request': self.context['request']}).data
             return rock_obj
        except:
            return None

    def get_area_detail(self, obj):
        try:
            add_obj = obj.area_detail
            return str(add_obj.parent_categry.region) + '-' + str(add_obj.region)
        except:
            return None

    def get_pol_type(self, obj):
        try:
            return obj.pol_type.pol_type
        except:
            return None

    def get_lit_des(self, obj):
        try:
            return obj.lit_des.lit_des
        except:
            return None

    def get_well_name(self, obj):
        try:
            return obj.area_detail.parent_categry.parent_categry.region
        except:
            return None

哎哎哎，较好的解决了，夸自己一下。