Django

Question

所以我正在尝试在 django-admin 中构建一个食谱字段。我有一个名为 Meals 的模型类别，我可以在管理页面上选择类别，但是当我尝试保存我的条目时，我得到 Select a valid choice. Breakfast is not one of the available choices 并阻止我保存任何内容。

我试过将食谱字段中的 daily_meals 值移到膳食类别中并取消注释第一个 meal 并注释食谱字段中的第二个值。

如何在膳食类别中创建新的膳食，就像食物类别一样，同时已经在列表中预先保存了膳食？

Meal categories

admin error after save

这是我的代码：

Models.py

from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone




# Food Category
class Category(models.Model):
    name = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250, unique=True)


    class Meta:
        ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'

    def __str__(self):
        return self.name

# Meal Category
class Meal(models.Model):
    name = models.CharField(max_length=250)
    slug = models.SlugField(max_length=250, unique=True)



    class Meta:
        ordering = ('name',)
        verbose_name = 'meal'
        verbose_name_plural = 'meals'

    def __str__(self):
        return self.name


# Recipe Field
class Recipe(models.Model):

    title = models.CharField(max_length=200)
    category = models.ForeignKey(Category, on_delete=models.CASCADE,)
    daily_meals = (
        ('Breakfast','Breakfast'),
        ('Brunch','Brunch'),
        ('Elevenses','Elevenses'),
        ('Lunch','Lunch'),
        ('Tea','Tea'),
        ('Supper','Supper'),
        ('Dinner','Dinner'),
    )
    # meal = models.CharField(max_length=100, choices = daily_meals)
    meal = models.ForeignKey(Meal, choices = daily_meals, on_delete=models.CASCADE,)
    ingredients = models.TextField(blank=True)
    directions = models.TextField(blank=True)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    user = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        return self.title

Admin.py

from django.contrib import admin
from .models import Recipe, Category, Meal



class CategoryAdmin(admin.ModelAdmin):
    list_display = ('name', 'slug')
    prepopulated_fields = {'slug': ('name',)}


admin.site.register(Category, CategoryAdmin)




class MealAdmin(admin.ModelAdmin):
    list_display = ('name', 'slug')
    prepopulated_fields = {'slug': ('name',)}


admin.site.register(Meal, MealAdmin)





class RecipeAdmin(admin.ModelAdmin):
    readonly_fields = ('created',)

admin.site.register(Recipe, RecipeAdmin)

Answer 1

ForeignKey 字段通常不使用选项。选择是根据数据库中的内容生成的。如果您自己构建选择，choice[0] 必须是 Meal table 的有效主键。也就是说，如果您想将选择限制在某些情况下，可以使用 limit_choices_to 参数：

daily_meals = ['Breakfast', 'Brunch', 'Elevenses', 'Lunch', 'Tea', 'Supper', 'Dinner']
# ...
meal = models.ForeignKey(Meal, limit_choices_to={'name__in': daily_meals}, on_delete=models.CASCADE,)

Django - Admin 中的模型类别错误：“Select 一个有效的选择。该选择不是可用的选择之一”

Django - Models category error in Admin: “Select a valid choice. That choice is not one of the available choices”

django-models

django-admin

Models.py

Admin.py