Django Tastypie creando nuevo recurso que tiene claves foráneas?

Question

Estoy tratando de hacer que la creación de nuevas instancias con Tastypie funcione, pero sigo recibiendo este error con las claves externas. Aquí es mis cosas:

Modelos:

class SuggestionVote(models.Model): 
    created_by_user = models.ForeignKey(User) 
    date_created = models.DateTimeField(auto_now_add = True) 
    suggestion = models.ForeignKey(Suggestion) 

class Suggestion(models.Model): 
    title = models.TextField(blank=True,null=True) 
    created_by_user = models.ForeignKey(User) 
    date_created = models.DateTimeField(auto_now_add = True) 
    votes = models.IntegerField(default=0)  

    def __unicode__(self): 
     return self.title 

recursos Modelo (yo uso mi propio método de autenticación):

class UserResource(ModelResource): 
    class Meta: 
     list_allowed_methods = ['get'] 
     queryset = User.objects.all() 
     resource_name = 'user' 
     authentication = MyBasicAuthentication() 
     authorization = DjangoAuthorization() 
class SuggestionResource(ModelResource): 
    class Meta: 
     list_allowed_methods = ['get'] 
     queryset = Suggestion.objects.all() 
     resource_name = 'suggestion' 
     authentication = MyBasicAuthentication() 
     authorization = DjangoAuthorization() 

class SuggestionVoteResource(ModelResource): 
    class Meta: 
     list_allowed_methods = ['get', 'post'] 
     detail_allowed_methods = ['get', 'post', 'put', 'delete'] 
     queryset = SuggestionVote.objects.all() 
     resource_name = 'suggestionvote' 
     authentication = MyBasicAuthentication() 
     authorization = DjangoAuthorization() 

Mi llamada a la API usando jQuery:

var data = JSON.stringify({ 
    "suggestion": "/api/suggestion/1/", 
    "created_by_user": "/api/user/1/" 
}); 

$.ajax({ 
    url: 'http://127.0.0.1:8000/api/suggestionvote/', 
    type: 'POST', 
    contentType: 'application/json', 
    data: data, 
    dataType: 'json', 
    processData: false 
}); 

Y el error que obtengo:

(1048, \ "columna 'created_by_user_id' no puede ser nulo \")

Me estoy perdiendo algo aquí?

Answer 1

Creo que lo que necesita es la definición del campo de relación, algo como esto debería funcionar:

from tastypie import fields 

class SuggestionResource(ModelResource): 
    # the relationship 
    created_by_user = fields.ToOneField(UserResource, 'created_by_user', full = True) 

    class Meta: 
     list_allowed_methods = ['get'] 
     queryset = Suggestion.objects.all() 
     resource_name = 'suggestion' 
     authentication = MyBasicAuthentication() 
     authorization = DjangoAuthorization() 

He comprobado y sin definición de campo similar consigo un error como el suyo.

Answer 2

Esto también funciona. Como se explica aquí en este Tastypie Tutorial

from tastypie import fields 

class SuggestionResource(ModelResource): 
    # the relationship 
    created_by_user = fields.ForeignKey(UserResource, 'created_by_user') 

    class Meta: 
     list_allowed_methods = ['get'] 
     queryset = Suggestion.objects.all() 
     resource_name = 'suggestion' 
     authentication = MyBasicAuthentication() 
     authorization = DjangoAuthorization()