django-ajax选择应用程序：如果在数据库中还没有创建新对象，该怎么做？ [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-chosen ，这是一个免费的django应用程序提供jquery自动完成功能。
我已经工作了 - 即它是自动完成我想要的表单字段。但我有一个问题...我在一个ModelForm中使用它，它将伙伴关系对象添加到数据库中：
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合作伙伴（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'）
我希望用户能够将名称和姓氏放入female_partner和male_partner字段，即使这样的Skater对象不存在，并且我想要该对象创建。我该怎么做呢？我不能将代码放在表单的保存方法中，因为该字段不会验证（这不是有效的Skater）。
编辑1：
添加更多代码...
表单：
class PartnershipAddForm（forms.ModelForm）：
female_partner = AutoCompleteSelectField（'female_skater'，required = True）
male_partner = AutoCompleteSelectField（'male_skater'，required = True）
class Meta：
model = Partnership
settings.py：
AJAX_LOOKUP_CHANNELS = {
'female_skater'：（'skaters.lookups'，'FemaleLookup'），
'male_skater' 'skaters.lookups'，'MaleLookup'），
}
lookups.py（MaleLookup是相同的，除了gender = MALE）：
class FemaleLookup（object）：
def get_query （self，q，request）：
返回一个查询集如果需要，也可以访问request.user$
返回Skater.objects.filter（Q（gender = FEMALE）& （Q（name__istartswith = q）| Q（surname__istartswith = q）））
def format_item（self，skater）：
当对象显示在所选对象的列表
return unicode（skater）
def format_result（self，skater）：
一个更详细的显示，用于搜索结果显示。可能包含html和多行
return％s< br /> ％unicode（skater）
def get_objects（self，ids）：
给出了一个ids列表，返回在管理页面上按需要排序的对象
这是用于显示当前选择的项目（在ManyToMany字段的情况下）
返回Skater.objects.filter（pk__in = ids）.order_by（'name'，'surname '）
AutoCompleteSelectField保存对象的ID，而不是文本，这就是为什么我一直有必需错误（为什么丹尼尔的解决方案不起作用）。值变量为空，因为不存在的Skater没有ID。
我不知道这是最好的做法，但是我最终使用AutoCompleteField而不是AutoCompleteSelectField。 AutoCompleteField保存文本，但不会为我创建一个Skater对象。
代码：
<$ p $
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]中的i：
name [i]，surname [i] = get_name_surname（partners [i]）
partners = [无，无]
partners_created = [无，无]
gender = [FEMALE， MALE] [0,1]中的
：
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]，
）
返回合作伙伴
I'm using django-ajax-selects, which is a freely available django app providing jquery autocomplete functionality.
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')
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).
EDIT 1: Adding in more code...
The form:
class PartnershipAddForm(forms.ModelForm):
female_partner = AutoCompleteSelectField('female_skater',required=True)
male_partner = AutoCompleteSelectField('male_skater',required=True)
class Meta:
model = Partnership
settings.py:
AJAX_LOOKUP_CHANNELS = {
'female_skater' : ('skaters.lookups', 'FemaleLookup'),
'male_skater' : ('skaters.lookups', 'MaleLookup'),
}
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')
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.
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.
The code:
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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