django-tastypie and many to many "through" relationships
django, rest, tastypie
Solution
You mentioned:
I may have found the error myself. ToManyField should be directed toward Ingredient and not RecipeIngredient. I'll see if this does the job.
There's a better approach though [Tastypie M2M](http://blog.eugene-yeo.in/django-tastypie-manytomany-through.html) (old blog is offline: https://github.com/9gix/eugene-yeo.in/blob/master/content/web/django-tastiepie-m2m.rst)
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.
Update (2014 Apr)
This answer is made long ago. Not sure if it is still useful.
Problem
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 Here are my sample models: ``` 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) ``` 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' ``` I'm trying to base my code on this example: http://pastebin.com/L7U5rKn9 Unfortunately, with this code I get this error: ``` "error_message": "'Ingredient' object has no attribute 'recipe'" ``` Does anyone know what's happening here? Or how I can include the name of the ingredient in the RecipeIngredientResource? Thanks! EDIT: I may have found the error myself. ToManyField should be directed toward Ingredient and not RecipeIngredient. I'll see if this does the job. EDIT: New error.. any ideas? The object '' has an empty attribute 'title' and doesn't allow a default or null value.