django-ajax-selects应用程序:当数据库中还没有对象时,如何创建一个新对象? [英] django-ajax-selects app: How do I create a new object when there isn't already one in the database?
问题描述
我正在使用 django-ajax-selects 免费提供的django应用程序,提供jQuery自动完成功能.
I'm using django-ajax-selects, which is a freely available django app providing jquery autocomplete functionality.
我已经开始工作了-即它正在自动填充我想要的表单字段.但是我有一个问题...我在ModelForm中使用它,该模型将Partnershipship对象添加到数据库中:
I've got it working - i.e. it is autocompleting the form fields I want it to. But I have a problem... I'm using it in a ModelForm which adds Partnership objects to the database:
class Skater(models.Model):
name = models.CharField(max_length=64)
surname = models.CharField(max_length=64)
gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
class Partnership(models.Model):
female_partner = models.ForeignKey(Skater, limit_choices_to = {'gender': FEMALE}, related_name='female_partner_set')
male_partner = models.ForeignKey(Skater, limit_choices_to = {'gender': MALE}, related_name='male_partner_set')
我希望用户能够在female_partner和male_partner字段中输入名称和姓氏,即使这样的Skater对象不存在,我也希望创建该对象.我该怎么做呢?我无法将代码放入表单的save方法中,因为该字段不会生效(这不是有效的溜冰者).
I want the user to be able to put in a name and surname into the female_partner and male_partner field even if a Skater object like that doesn't exist and I want that object created. How do I go about doing this? I cannot put the code in the form's save method because the field won't validate (it's not a valid Skater).
添加更多代码...
EDIT 1: Adding in more code...
表格:
class PartnershipAddForm(forms.ModelForm):
female_partner = AutoCompleteSelectField('female_skater',required=True)
male_partner = AutoCompleteSelectField('male_skater',required=True)
class Meta:
model = Partnership
settings.py:
settings.py:
AJAX_LOOKUP_CHANNELS = {
'female_skater' : ('skaters.lookups', 'FemaleLookup'),
'male_skater' : ('skaters.lookups', 'MaleLookup'),
}
lookups.py(MaleLookup相同,只是性别= MALE):
lookups.py (MaleLookup is the same except that gender=MALE):
class FemaleLookup(object):
def get_query(self,q,request):
""" return a query set. you also have access to request.user if needed """
return Skater.objects.filter(Q(gender=FEMALE) & (Q(name__istartswith=q) | Q(surname__istartswith=q)))
def format_item(self,skater):
""" simple display of an object when it is displayed in the list of selected objects """
return unicode(skater)
def format_result(self,skater):
""" a more verbose display, used in the search results display. may contain html and multi-lines """
return "%s<br/>" % unicode(skater)
def get_objects(self,ids):
""" given a list of ids, return the objects ordered as you would like them on the admin page.
this is for displaying the currently selected items (in the case of a ManyToMany field)
"""
return Skater.objects.filter(pk__in=ids).order_by('name','surname')
推荐答案
AutoCompleteSelectField保留对象的ID而不是文本,这就是为什么我一直存在"required"错误的原因(以及Daniel的解决方案不起作用的原因)).值变量为空,因为不存在的溜冰者没有ID.
AutoCompleteSelectField holds the id of the object rather than the text, which is why I had the "required" error all along (and why Daniel's solution doesn't work). The value variable was empty as a Skater that doesn't exist doesn't have an id.
我不确定这是最好的方法,但是我最终使用了AutoCompleteField而不是AutoCompleteSelectField.AutoCompleteField保存文本,但不会为我创建Skater对象.
I'm not sure this is the best way of doing this, but I ended up using AutoCompleteField instead of AutoCompleteSelectField. AutoCompleteField holds text, but it doesn't create a Skater object for me.
代码:
class PartnershipAddForm(forms.ModelForm):
female_partner = AutoCompleteField('female_skater',required=True)
male_partner = AutoCompleteField('male_skater',required=True)
class Meta:
model = Partnership
def save(self):
partners = [self.cleaned_data['female_partner'],
self.cleaned_data['male_partner']]
name = ['','']
surname = ['','']
for i in [0,1]:
name[i],surname[i] = get_name_surname(partners[i])
partners = [None,None]
partners_created = [None,None]
gender = [FEMALE,MALE]
for i in [0,1]:
partners[i],partners_created[i] = Skater.objects.get_or_create(
name=name[i],
surname=surname[i],
gender=gender[i]
)
partnership, created = Partnership.objects.get_or_create(
female_partner=partners[0],
male_partner=partners[1],
)
return partnership
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