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我对 django 完全陌生，以前是 php 编码器，所以如果我很笨，请多多包涵。我在我的应用程序中定义了三个模型，理解、问题、答案。每个理解都有多个问题和答案，在 Comprehension 模型中定义为“内联”。问题由管理员直接输入，但答案会自动从理解中添加。我想要实现的是，将理解拆分为句子，并将每个句子添加为带有当前理解外键的答案对象。我正在尝试覆盖 Comprehension 模型中的保存方法。但是当我点击保存时，它给出了一个实例错误

Cannot assign "23L": "Answer.ComprehensionAnswer" must be a "Comprehension" instance.

我如何在这里分配/创建和实例？还是我采用了错误的方法。如果是这样，请指导我正确的方法。

以下是models.py的内容

class Question(models.Model):
    QuestionText = models.CharField(max_length=500, verbose_name='Question Text')
    QuestionTypeID = models.ManyToManyField(QuestionType, verbose_name='Question Type')
    ComprehensionQuestion = models.ForeignKey(Comprehension, verbose_name='comprehension')
    QuestionRemarks = models.CharField(max_length=500, verbose_name='remarks', null=True, blank=True)
    LastUpdate = models.DateTimeField(auto_now=True)
    def __unicode__(self):
       return self.QuestionText
    def was_published_recently(self):
       return self.LastUpdate >= timezone.now() - datetime.timedelta(1)

class Answer(models.Model):
    AnswerText = models.CharField(max_length=500, verbose_name='Answer Text')
    AnswerTypeID = models.ManyToManyField(AnswerType, verbose_name='Answer Type')
    ComprehensionAnswer = models.ForeignKey(Comprehension, verbose_name='Comprehension', null=True, blank=True)
    AnswerRemarks = models.CharField(max_length=500, verbose_name='Remarks')
    LastUpdate = models.DateTimeField(auto_now=True)
    def __unicode__(self):
       return self.AnswerText

class Comprehension(models.Model):
    ComprehensionTitle = models.CharField(max_length=100, verbose_name='Comprehension Title')
    ComprehensionsText = models.TextField(verbose_name='Text')
    ComprehensionsRemarks = models.CharField(max_length=400, verbose_name='Remarks for this Comprehension', null=True,  blank=True)
    LastUpdate = models.DateTimeField("Last Updated", auto_now=True)
    def __unicode__(self):
       return self.ComprehensionTitle
    def was_published_recently(self):
       return self.LastUpdate >= timezone.now() - datetime.timedelta(1)

    def save(self, *args, **kwargs):
       #overrides the default save function to split the comprehension paragraph into sentences and adds them as probable answers
       AnswerList = self.ComprehensionsText.split("u'\u0964'")

    for sentence in AnswerList:
        p = Answer.objects.create(AnswerText = sentence, ComprehensionAnswer = self.pk)

    super(Comprehension, self).save(*args, **kwargs)

admin.py 中的内容

class ComprehensionAdmin(admin.ModelAdmin):
    form = ComprehensionForm
    fieldsets = [
    ('Main', {'fields': ['ComprehensionTitle','ComprehensionsText']}),
    ('Additional Info', {'fields': ['ComprehensionsRemarks'], 'classes': ['collapse']}),
    ]
    inlines = [QuestionInline, AnswerInline]
    list_display = ('ComprehensionTitle', 'LastUpdate')
    list_per_page = 10


class QuestionInline(admin.TabularInline): 
    model = Question
    extra = 2

class AnswerInline(admin.TabularInline):   
    model = Answer
    extra = 2

admin.site.register(Question)
admin.site.register(Answer)
admin.site.register(Comprehension, ComprehensionAdmin)

我也遵循了这个页面上提到的方法。但是，关于如何使用 Comprehension 模型的外键创建提交条件下的对象却是空白。

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1 回答 1

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您应该使用self而不是self.pk并注意self引用当前对象。

p = Answer.objects.create(AnswerText = sentence, ComprehensionAnswer = self)

从回溯中可以清楚地看出，模型的ComprehensionAnswer属性Answer期望Comprehension模型的对象。但是您正在传递该对象的 id。

于 2016-03-06T07:02:04.650 回答