django.db.utils.IntegrityError: (1048, “Column 'category_type' cannot be null”)

Question

goods.py

class Goods(models.Model):
    category = models.ForeignKey(GoodsCategory, verbose_name='xxx')
    goods_sn = models.CharField(default='', max_length=50, verbose_name='xxx')
    name = models.CharField(max_length=300, verbose_name='xxx')
    click_num = models.IntegerField(default=0, verbose_name='xxx')
    sold_num = models.IntegerField(default=0, verbose_name='xxx')

GoodsCategory.py

class GoodsCategory(models.Model):
    CATEGORY_TYPE = (
        (1, "Level 1"),
        (2, "Level 2"),
        (3, "Level 3"),
    )
    name = models.CharField(default="", max_length=30, verbose_name="Category name", help_text="Category name")
    code = models.CharField(default="", max_length=30)
    desc = models.TextField(default="", verbose_name="describe")
    category_type = models.IntegerField(choices=CATEGORY_TYPE, verbose_name="Category Level", help_text="Category Leve")
    parent_category = models.ForeignKey("self", null=True, blank=True, related_name="sub_cat")
    is_tab = models.BooleanField(default=False)
    add_time = models.DateTimeField(default=datetime.now)

import_goods_data.py

for goods_detail in row_data:
    goods = Goods()
    goods.name = goods_detail["name"]
    goods.market_price = float(int(goods_detail["market_price"].replace("￥", "").replace("$", "")))
    goods.shop_price = float(int(goods_detail["sale_price"].replace("￥", "").replace("$", "")))
    goods.goods_brief = goods_detail["desc"] if goods_detail["desc"] is not None else ""
    goods.goods_desc = goods_detail["goods_desc"] if goods_detail["goods_desc"] is not None else ""
    goods.goods_front_image = goods_detail["images"][0] if goods_detail["images"] else ""
    category_name = goods_detail["categorys"][-1]
    categories = GoodsCategory.objects.filter(name=category_name) 
    if categories.exists():
        category = categories[0]
    else:
        category = GoodsCategory.objects.create(name=category_name)
    goods.category = category
    goods.save()

When I run this script import local data into mysql, I get this error:

django.db.utils.IntegrityError: (1048, "Column 'category_type' cannot be null")

I have tried many times and still haven't solved this problem. Can you help me?

Answer 1

When creating a new GoodsCategory you need to explicitly set a category_type , set a default value or set the field as nullable ( null=True ) in the model. Model field reference #default

Answer 2

如果你想在数据库中保存空/空，你需要稍微改变你的模型。

category_type = models.IntegerField(choices=CATEGORY_TYPE, verbose_name="Category Level", help_text="Category Leve", null=True, default=None)