Question

我是django的新手，以前是一个php编码器，所以如果我愚蠢的话，请耐心等待。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，定义为＆＃39; inline＆＃39;在理解模型中。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，将理解分成句子并将每个句子添加为当前理解的外键的答案对象。我试图覆盖理解模型中的保存方法。但是，当我单击“保存”时，它会显示实例错误

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

如何在此处分配/创建和实例？或者我采取了错误的做法。如果是这样，请指导我采用正确的方法。

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page中提到的方法。但是，关于如何使用Comprehension model的外键在提交条件下创建对象的空白。

Answer 1

您应该使用self代替self.pk，并注意self引用当前对象。

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

从回溯中，它清楚地表明，ComprehensionAnswer模型的Answer属性需要Comprehension模型的对象。但是你传递了那个对象的id。

在for循环中在django admin中创建另一个模型对象

1 个答案: