tastypie和许多到许多

tastypie和许多到许多

本文介绍了django-tastypie和许多到许多“直通”关系的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

在Django和Deliciouspie中,我试图弄清楚如何正确处理通过关系,例如在这里找到的:

In Django and Tastypie I'm attempting to figure out how to properly deal with Many to Many "through" relationships, like those found here: https://docs.djangoproject.com/en/dev/topics/db/models/#extra-fields-on-many-to-many-relationships

以下是我的示例模型:

class Ingredient(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField()

class RecipeIngredients(models.Model):
    recipe = models.ForeignKey('Recipe')
    ingredient = models.ForeignKey('Ingredient')
    weight = models.IntegerField(null = True, blank = True)

class Recipe(models.Model):
    title = models.CharField(max_length=100)
    ingredients = models.ManyToManyField(Ingredient, related_name='ingredients', through='RecipeIngredients', null = True, blank = True)

现在我的api.py文件:

Now my api.py file:

class IngredientResource(ModelResource):
    ingredients = fields.ToOneField('RecipeResource', 'ingredients', full=True)

    class Meta:
        queryset = Ingredient.objects.all()
        resource_name = "ingredients"


class RecipeIngredientResource(ModelResource):
    ingredient = fields.ToOneField(IngredientResource, 'ingredients', full=True)
    recipe = fields.ToOneField('RecipeResource', 'recipe', full=True)

    class Meta:
        queryset= RecipeIngredients.objects.all()


class RecipeResource(ModelResource):
    ingredients = fields.ToManyField(RecipeIngredientResource, 'ingredients', full=True)

class Meta:
    queryset = Recipe.objects.all()
    resource_name = 'recipe'

我试图基于以下示例创建代码:

I'm trying to base my code on this example: http://pastebin.com/L7U5rKn9

不幸的是,使用此代码,我收到此错误:

Unfortunately, with this code I get this error:

"error_message": "'Ingredient' object has no attribute 'recipe'"

有人知道这里发生了什么吗?或者如何在RecipeIngredientResource中包含成分名称?谢谢!

Does anyone know what's happening here? Or how I can include the name of the ingredient in the RecipeIngredientResource? Thanks!

编辑:

我可能自己也发现了错误。 ToManyField应该针对成分而不是RecipeIngredient。我会看看这是否起作用。

I may have found the error myself. ToManyField should be directed toward Ingredient and not RecipeIngredient. I'll see if this does the job.

编辑:

新错误..有什么想法吗?
对象的属性'title'为空,不允许使用默认值或null值。

New error.. any ideas?The object '' has an empty attribute 'title' and doesn't allow a default or null value.

推荐答案

您提到了:

虽然[Tastypie M2M] (旧博客离线:)

There's a better approach though [Tastypie M2M] (old blog is offline: https://github.com/9gix/eugene-yeo.in/blob/master/content/web/django-tastiepie-m2m.rst)

简而言之,我对配料使用了 ToManyField 而不是 ToManyField ThroughModel 。并将自定义属性 kwargs设为返回 ThroughModel 查询集的回调函数。

In short summary, Instead of ToManyField to Ingredients, I use ToManyField toward the ThroughModel. And customize the attribute kwargs to be a callback function that return the ThroughModel Queryset.

这个答案是很久以前做出的。不知道它是否仍然有用。

This answer is made long ago. Not sure if it is still useful.

这篇关于django-tastypie和许多到许多“直通”关系的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

07-26 16:26